Large Synoptic Survey Telescope
Camera Subsystem Specifications
LSE-59
LSE-59 – Camera Requirements
This document is generated from SysML and is intended to be used as a
review copy only. This document is not released. It is not in the final format.
Creation date: July 12, 2011
The contents of this document are subject to configuration control and may not be changed, altered, or
their provisions waived without prior approval of the LSST Change Control Board.
2016-02-09
Page 1 of 39
Large Synoptic Survey Telescope
Camera Subsystem Specifications
LSE-59
Table of Contents
Requirements .......................................................................................................................... 5
1 Camera Performance Allocations ................................................................................. 5
1.1 Camera throughput ....................................................................................................................5
1.1.1 Camera optical throughput .....................................................................................................5
1.1.1.1 CameraOpticalThroughput ...............................................................................................6
1.1.2 Effective Area .........................................................................................................................6
1.1.2.1 Detector Plane Active Area ..............................................................................................6
TotalArea .....................................................................................................................................6
1.1.2.2 Detector Plane central fill factor .......................................................................................6
CentralFill .....................................................................................................................................6
1.1.2.3 Detector plane fill factor ...................................................................................................7
TotalFill ........................................................................................................................................7
1.1.3 Detector plane allowable dead pixels.....................................................................................7
1.1.3.1 fpaLosses .........................................................................................................................7
1.2 Filter Response ...........................................................................................................................7
1.2.1 Filter Out of Band Leakage, Incremental ...............................................................................7
1.2.1.1 filterOutofBandIncremental ..............................................................................................8
1.2.2 Filter Out of Band Leakage, Total ..........................................................................................8
1.2.2.1 filterOutofBand .................................................................................................................8
1.2.3 Filter Response Uniformity .....................................................................................................8
1.2.3.1 filterUniformity ..................................................................................................................8
1.2.4 In-band Ripple ........................................................................................................................9
1.2.4.1 inBandRipple ....................................................................................................................9
1.2.5 u-band Response ...................................................................................................................9
1.2.5.1 uResponseNom ...............................................................................................................9
1.2.5.2 uResponseEnv .................................................................................................................9
1.2.6 g-band Response .................................................................................................................10
1.2.6.1 gResponseNom .............................................................................................................10
1.2.6.2 gResponseEnv ...............................................................................................................11
1.2.7 r-band Response ..................................................................................................................11
1.2.7.1 rResponseNom ..............................................................................................................11
1.2.7.2 rResponseEnv................................................................................................................12
1.2.8 i-band Response ..................................................................................................................12
1.2.8.1 iResponseNom...............................................................................................................12
1.2.8.2 iResponseEnv ................................................................................................................13
1.2.9 z-band Response .................................................................................................................13
1.2.9.1 zResponseNom..............................................................................................................14
1.2.9.2 zResponseEnv ...............................................................................................................14
1.2.10 y-band Response ...............................................................................................................14
1.2.10.1 yResponseNom ...........................................................................................................15
1.2.10.2 yResponseEnv .............................................................................................................15
1.3 Dynamic Range .........................................................................................................................16
1.3.1 dynamicRange .....................................................................................................................16
1.4 Image bits per pixel ..................................................................................................................16
1.4.1 CampixelBitDepth .................................................................................................................16
1.5 Camera max image quality error .............................................................................................16
1.5.1 CameraImageQuality ...........................................................................................................16
1.6 Camera lifetime .........................................................................................................................17
1.6.1 CamLifetime .........................................................................................................................17
1.7 Total system read noise ...........................................................................................................17
1.7.1 iCamReadNoise ...................................................................................................................17
1.8 Detector pixel pitch ..................................................................................................................17
1.8.1 PixelPitch ..............................................................................................................................17
The contents of this document are subject to configuration control and may not be changed, altered, or
their provisions waived without prior approval of the LSST Change Control Board.
2016-02-09
Page 2 of 39
Large Synoptic Survey Telescope
Camera Subsystem Specifications
LSE-59
1.9 Radioactive background ..........................................................................................................18
1.10 Electromagnetic Emissions...................................................................................................18
1.11 Electromagnetic Susceptibility .............................................................................................18
1.12 Light Emissions ......................................................................................................................18
2
Camera Optical Design ................................................................................................ 18
2.1 L1 Lens Prescription ................................................................................................................19
2.1.1 L1LensPrescription...............................................................................................................19
2.2 L2 Lens Presciption .................................................................................................................19
2.2.1 L2LensPresciption ................................................................................................................19
2.3 Filter Prescription .....................................................................................................................20
2.3.1 filterPrescription ....................................................................................................................20
2.4 L3 Lens Prescription ................................................................................................................20
2.4.1 L3LensPresciption ................................................................................................................21
2.5 Camera optics spacings ..........................................................................................................21
2.5.1 CameraOpticsSpacings........................................................................................................21
2.6 Detector plane+L3+Filter gap adjustability to L2 ..................................................................22
2.6.1 DetL3FilterAdjust ..................................................................................................................22
2.7 Detector plane-L3 gap adjustability ........................................................................................22
2.7.1 Det-L3GapAdjust ..................................................................................................................22
3
Camera Stray and Scattered Light .............................................................................. 22
3.1 Lens Maximum Reflectance ....................................................................................................23
3.1.1 Maximum lens reflectance ...................................................................................................23
3.2 Reflective surface treatments .................................................................................................23
3.3 Optical Baffling .........................................................................................................................23
4
Photometric Requirements.......................................................................................... 23
4.1 Camera optical throughput variation .....................................................................................23
4.1.1 ThroughputVarOverFOV ......................................................................................................23
4.2 Exposure duration accuracy ...................................................................................................24
4.2.1 ExposureDurationAccuracy ..................................................................................................24
4.3 Exposure duration repeatability .............................................................................................24
4.3.1 ExposureDurationRepeatability ............................................................................................24
4.4 Exposure duration uniformity .................................................................................................24
4.4.1 ExposureDurationUniformity ................................................................................................24
4.5 Filter positioning for photometric precision ..........................................................................24
4.5.1 FilterPosPhotoError ..............................................................................................................25
4.6 Throughput as-built knowledge ..............................................................................................25
4.6.1 ThroughputOverFOV ............................................................................................................25
4.7 Throughput stability .................................................................................................................25
4.7.1 ThroughputStability ..............................................................................................................25
5
Guiding ......................................................................................................................... 25
5.1
6
6.1
6.2
7
Guide Sensors ..........................................................................................................................26
Wavefront Sensing ....................................................................................................... 26
Wavefront Sensor Data ............................................................................................................26
Wavefront Sensors ...................................................................................................................26
Camera operations ....................................................................................................... 26
7.1 Camera command and telemetry ............................................................................................26
7.1.1 Commanding from OCS .......................................................................................................26
7.1.2 Camera telemetry transfer method ......................................................................................27
7.1.3 Camera meta-data availability ..............................................................................................27
7.1.4 Camera State Notification ....................................................................................................27
7.1.5 Camera Status .....................................................................................................................27
7.2 Exposure Control Operations .................................................................................................27
7.2.1 Visit timing ............................................................................................................................27
7.2.1.1 CamVisitTiming ..............................................................................................................27
7.2.2 Bias/zero exposures .............................................................................................................28
The contents of this document are subject to configuration control and may not be changed, altered, or
their provisions waived without prior approval of the LSST Change Control Board.
2016-02-09
Page 3 of 39
Large Synoptic Survey Telescope
Camera Subsystem Specifications
LSE-59
7.2.3 Closed-shutter integration ....................................................................................................28
7.2.4 Max exposure duration .........................................................................................................28
7.2.5 Min exposure duration ..........................................................................................................28
7.2.5.1 MinExposureDuration ....................................................................................................28
7.3 Science data read-out ..............................................................................................................28
7.3.1 Science Image Identifier .......................................................................................................28
7.3.2 Cross-talk corrected image data ..........................................................................................29
7.3.3 Raw Image Data ...................................................................................................................29
7.3.4 Persistence of raw data ........................................................................................................29
7.3.4.1 CamPersist.....................................................................................................................29
7.3.5 Raw data buffer readout .......................................................................................................29
7.3.5.1 PersistReadout...............................................................................................................29
7.3.6 Wavefront data to DM ..........................................................................................................29
7.4 Time Reference .........................................................................................................................30
7.4.1 Reference clock ....................................................................................................................30
7.4.2 Reference to master clock ...................................................................................................30
7.4.3 Time accuracy ......................................................................................................................30
7.4.3.1 CamTimeAbsAcc ...........................................................................................................30
7.4.4 Time precision ......................................................................................................................30
7.4.4.1 CamTimePrecision .........................................................................................................30
7.5 Filter Operations .......................................................................................................................31
7.5.1 Filter swap in place ...............................................................................................................31
7.5.2 Filter complement .................................................................................................................31
7.5.2.1 NumFilters ......................................................................................................................31
7.5.3 Filter exchange duration .......................................................................................................31
7.5.3.1 FilterExchangeDuration .................................................................................................31
7.5.4 Filter swap-out duration ........................................................................................................31
7.5.4.1 FilterSwapOutDuration ...................................................................................................32
7.5.5 Number of filter exchanges ..................................................................................................32
7.5.5.1 NumFilterChanges .........................................................................................................32
7.5.6 Number of filter swap-outs ...................................................................................................32
7.5.6.1 NumManualFilterChanges .............................................................................................32
7.6 Camera Power-on ....................................................................................................................32
7.6.1 CamActivationTime ..............................................................................................................33
7.7 Camera Initialization .................................................................................................................33
7.8 Camera Stand-alone Operations .............................................................................................33
7.9 Camera Engineering and Maintenance ..................................................................................33
7.10 Remote Operation Capabilities .............................................................................................33
7.11 Camera Scheduled Maintenance ..........................................................................................33
7.11.1 CamMaintenanceTime .......................................................................................................34
7.12 Maintenance Recommendations ..........................................................................................34
7.13 Camera unscheduled downtime ...........................................................................................34
7.13.1 CamDowntime ....................................................................................................................34
7.14 Number of shutter actuations ...............................................................................................34
7.14.1 nRawExpYear ....................................................................................................................34
7.15 Safety System .........................................................................................................................34
7.16 Baseline Performance ............................................................................................................35
7.17 Trend analysis ........................................................................................................................35
8
Camera Environmental Requirements ........................................................................ 35
8.1 Normal Operations ...................................................................................................................35
8.1.1 normEnvironment .................................................................................................................35
8.2 Marginal Condition Operations ...............................................................................................36
8.2.1 marginalEnvironment ...........................................................................................................36
8.3 Survival Condition Operations ................................................................................................36
8.3.1 survivalEnvironment .............................................................................................................36
8.4 Transportation Condition Design ...........................................................................................37
The contents of this document are subject to configuration control and may not be changed, altered, or
their provisions waived without prior approval of the LSST Change Control Board.
2016-02-09
Page 4 of 39
Large Synoptic Survey Telescope
Camera Subsystem Specifications
LSE-59
8.4.1 Transportation/Shipping .......................................................................................................37
8.5 Seismic Design .........................................................................................................................37
8.5.1 SeismicParameters ..............................................................................................................37
9
Standards ..................................................................................................................... 38
9.1
9.2
9.3
9.4
9.5
9.6
Component Standards .............................................................................................................38
Electrical and control standards .............................................................................................38
Cyber Security ..........................................................................................................................38
Health .........................................................................................................................................38
Safety .........................................................................................................................................38
Software Standards ..................................................................................................................38
The contents of this document are subject to configuration control and may not be changed, altered, or
their provisions waived without prior approval of the LSST Change Control Board.
2016-02-09
Page 5 of 39
Large Synoptic Survey Telescope
Camera Subsystem Specifications
LSE-59
Requirements
Introduction:
The Camera provides a 3.2-gigapixel flat focal plane array, tiled by 4K x 4K CCD sensors with 10-µm
square pixels. The sensors are deep-depleted, back-illuminated devices with a highly segmented
architecture that enables the entire array to be read out within the required 2 seconds. Detectors are
grouped into rafts in 3 x 3 arrays, each containing its own dedicated front-end and back-end electronics
boards. The rafts are mounted on a silicon carbide grid inside a vacuum Cryostat, with an intricate
thermal control system that maintains the CCDs at an operating temperature of -100 C. The entrance
window to the Cryostat is refractive lens L3, the third the three such lenses in the Camera. The other two
lenses, L1 and L2, are mounted in an optics structure at the front of the Camera Body, which also
contains a mechanical shutter and a Carousel assembly that holds five large optical filters. A sixth optical
filter can replace any of the five via a procedure accomplished during daylight hours.
The Camera provides wavefront sensing and guide sensing in addition to the science exposures. The
wavefront and guide images are used by the telescope system to support control of observatory pointing
and focus.
Document Scope:
The Camera Subsystem Specifications document defines the imaging performance, data processing
requirements and functional requirements necessary for nightly observing and calibration data collection.
It is derived from the Observatory System Specifications document (LSE-30).
Supporting Documents:
1- LSST Observatory System Specifications (LSE-30)
1 Camera Performance Allocations
Last Modified: 12/3/2010
1.1 Camera throughput
Last Modified: 6/9/2010
Discussion: The total throughput is composed of several effects. One is the optical throughput which
addresses losses through the optics and CCD responsivity. The second effect is the percentage of the
focal plane that is sensitive to light (fill factor and dead pixels). The third effect is the percentage of time
the camera is available (covered elsewhere as down time).
1.1.1
Camera optical throughput
ID: CAM-REQ-0001
Last Modified: 6/16/2011
Specification: The 10-year mean camera optical throughput shall be as defined in table
[CameraOpticalThroughput] for each filter bandpass, averaged over each filter passband between the
90% response points.
Discussion: The components of the optical throughput are the lenses plus losses, the sensor QE, and
the average filter transmissivity
The contents of this document are subject to configuration control and may not be changed, altered, or
their provisions waived without prior approval of the LSST Change Control Board.
2016-02-09
Page 6 of 39
Large Synoptic Survey Telescope
1.1.1.1
Camera Subsystem Specifications
LSE-59
CameraOpticalThroughput
Last Modified: 5/13/2010
Description
Value
Unit
Name
U-band optical throughput
30.7
Percent
G-band optical throughput
60.7
Percent
R-band optical throughput
70.1
Percent
61
Percent
Z-band optical throughput
48.5
Percent
Y-band optical throughput
10.1
Percent
CameraThroughput
-u
CameraThroughput
-g
CameraThroughput
-r
CameraThroughput
-i
CameraThroughput
-z
CameraThroughput
-y
I-band throughput
1.1.2
Effective Area
Last Modified: 8/18/2010
1.1.2.1
Detector Plane Active Area
ID: CAM-REQ-0002
Last Modified: 6/16/2011
Specification: The geometric area of the detector plane covered by science grade imaging devices shall
be at least [TotalArea] (TBR)
Discussion: This is the area equivalent to a 3.5 degree circle
TotalArea
Last Modified: 11/30/2010
Description
Value
Unit
Name
Total geometric focal plane coverage
634.17
mm^2
TotalArea
1.1.2.2
Detector Plane central fill factor
ID: CAM-REQ-0003
Last Modified: 11/30/2010
Specification: The fill factor within the central [TotalArea] shall be at least [CentralFill]
Discussion:The central area is defined as a circle with the center at the geometric center of the detector
plane and an area of [TotalArea]. Fill factor is defined as the fraction of area allocated within the clear
aperture for science sensors that actually contains active sensor area. Note that the active area may or
may not contain pixels that are live. The allowed fraction of dead pixels is specified in a separate
requirement.
CentralFill
Last Modified: 10/27/2010
The contents of this document are subject to configuration control and may not be changed, altered, or
their provisions waived without prior approval of the LSST Change Control Board.
2016-02-09
Page 7 of 39
Large Synoptic Survey Telescope
Camera Subsystem Specifications
Description
3.5 degree FOV fill factor
1.1.2.3
LSE-59
Value
Unit
Name
85
Percent
CentralFill
Detector plane fill factor
ID: CAM-REQ-0004
Last Modified: 6/3/2011
Specification: The fill factor of active pixels in the area covered by science grade imaging devices shall
be at least [TotalFill]
Discussion:
TotalFill
Last Modified: 10/27/2010
Description
Fill factor of active pixels in the area covered by science
grade imaging devices
1.1.3
Value
Unit
Name
90
Percent
TotalFill
Detector plane allowable dead pixels
ID: CAM-REQ-0005
Last Modified: 6/3/2011
Specification: The maximum percent of pixels on the detector plane within the 3.5 degree FOV that do
not meet their requirements at delivery shall be [deliveredPixelLoss]. The additional pixel loss over and
above the [deliveredPixelLoss] when averaged over the 10-year survey lifetime shall be no more than
[agedPixelLoss].
Discussion: This includes pixels in otherwise live detectors that do not meet spec, and includes dead
pixels, hot pixels, dead columns, and dead segments/amplifiers. It does not include pixels or parts of
detectors that are off or not functioning due to problems with read-out electronics
1.1.3.1
fpaLosses
Last Modified: 12/3/2010
Description
The minimum fraction of unusable pixels (those that can not
be calibrated to meet SRD/LSR specifications) at the time of
instrument delivery
The additional allowed pixel loss over and above the
deliveredPixelLoss when averaged over the 10-year survey
lifetime
Value
Unit
Name
2
Percent
deliveredPixelLoss
2
Percent
agedPixelLoss
1.2 Filter Response
Last Modified: 7/27/2010
1.2.1
Filter Out of Band Leakage, Incremental
ID: CAM-REQ-0006
Last Modified: 6/21/2011
The contents of this document are subject to configuration control and may not be changed, altered, or
their provisions waived without prior approval of the LSST Change Control Board.
2016-02-09
Page 8 of 39
Large Synoptic Survey Telescope
Camera Subsystem Specifications
LSE-59
Specification: Each of the 6 defined filters must block its out of band transmission according to the
specifications in the table below.
Discussion: For leakage that occurs in the wavelength region beyond 1050 the response of 200 micron
thick silicon at -100 C can be multiplied against the filter response in the leak evaluation.
1.2.1.1
filterOutofBandIncremental
Last Modified: 5/1/2011
Description
Value
The average leakage in any 10nm segment between 3001200nm outside the wavelength span one FWHM from the
central wavelength shall be no more than fLeak_10nm.
1.2.2
0.01
Unit
Name
Percent
fLeak_10nm
Filter Out of Band Leakage, Total
ID: CAM-REQ-0007
Last Modified: 6/15/2011
Specification: Each of the 6 defined filters must block its out of band transmission according to the
specifications in the table below.
Discussion: For leakage that occurs in the wavelength region beyond 1050 the response of 200 micron
thick silicon at -100 C can be multiplied against the filter response in the total integrated leak evaluation.
1.2.2.1
filterOutofBand
Last Modified: 10/28/2010
Description
The integrated over all wavelengths between 300-1200nm
outside the wavelength span between the first time the filter
response goes below 0.1% of the peak the total leakage shall
not exceeded fleakTotal.
1.2.3
Value
Unit
Name
0.05
Percent
fLeakTotal
Filter Response Uniformity
ID: CAM-REQ-0008
Last Modified: 6/15/2011
Specification: The filter response function as measured in any 100mm circle shall vary smoothly as a
function of radius by no more than filtUniformity from the measured response in the central 100mm circle.
1.2.3.1
filterUniformity
Last Modified: 10/28/2010
Description
Value
Unit
Name
The maximum filter response uniformity variation.
2.5%
Percent
filtUniformity
The contents of this document are subject to configuration control and may not be changed, altered, or
their provisions waived without prior approval of the LSST Change Control Board.
2016-02-09
Page 9 of 39
Large Synoptic Survey Telescope
1.2.4
Camera Subsystem Specifications
LSE-59
In-band Ripple
ID: CAM-REQ-0009
Last Modified: 6/16/2011
Specification: The in-band filter response function shall have a semi-amplitude peak-to-valley ripple of
no more than [maxFiltRipple] about the in-band mean response.
Discussion: The in-band region for measuring ripple is defined as the wavelength segment between the
red and blue upper envelope at the 100% relative response wavelengths and the red and blue lower
envelope at the 100% relative response wavelengths for positive and negative going excursions
respectively.
1.2.4.1
inBandRipple
Last Modified: 11/3/2010
Description
The maximum semi-amplitude peak-to-valley ripple.
1.2.5
Value
Unit
Name
3
Percent
maxFiltRipple
u-band Response
ID: CAM-REQ-0010
Last Modified: 6/16/2011
Specification: The response relative to the in-band average (as measured between [uLowerBlue_100]
and [uLowerRed_100]) of the u-band filter shall lie between the upper and lower envelopes defined in
the tables below.
Discussion: The target relative u-band response is defined by the nominal parameters below.
1.2.5.1
uResponseNom
Last Modified: 12/3/2010
Description
Value
The nominal u-band zero relative response wavelength on
the blue side.
The nominal u-band 50% relative response wavelength on
the blue side..
The nominal u-band 100% relative response wavelength on
the blue side.
The nominal u-band 100% relative response wavelength on
the red side.
The nominal u-band 50% relative response wavelength on
the blue side.
The nominal u-band zero relative response wavelength on
the blue side.
1.2.5.2
Unit
Name
309
nm
uNomBlue_0
321
nm
uNomBlue_50
334
nm
uNomBlue_100
379
nm
uNomRed_100
391
nm
uNomRed_50
404
nm
uNomRed_0
uResponseEnv
Last Modified: 12/3/2010
Description
Value
Unit
Name
The contents of this document are subject to configuration control and may not be changed, altered, or
their provisions waived without prior approval of the LSST Change Control Board.
2016-02-09
Page 10 of 39
Large Synoptic Survey Telescope
Camera Subsystem Specifications
Description
The lower envelope u-band zero relative response
wavelength on the blue side.
The lower envelope u-band 50% relative response
wavelength on the blue side.
The lower envelope u-band 100% relative response
wavelength on the blue side.
The lower envelope u-band 100% relative response
wavelength on the red side.
The lower envelope u-band 50% relative response
wavelength on the red side.
The lower envelope u-band zero relative response
wavelength on the red side.
The upper envelope u-band zero relative response
wavelength on the blue side.
The upper envelope u-band 50%relative response
wavelength on the blue side.
The upper envelope u-band 100% relative response
wavelength on the blue side.
The upper envelope u-band 100% relative response
wavelength on the red side.
The upper envelope u-band 50% relative response
wavelength on the red side.
The upper envelope u-band zero relative response
wavelength on the red side.
1.2.6
LSE-59
Value
Unit
Name
311
nm
uLowerBlue_0
323
nm
uLowerBlue_50
336
nm
uLowerBlue_100
377
nm
uLowerRed_100
389
nm
uLowerRed_50
402
nm
uLowerRed_0
306
nm
uUpperBlue_0
318
nm
uUpperBlue_50
331
nm
uUpperBlue_100
382
nm
uUpperRed_100
394
nm
uUpperRed_50
407
nm
uUpperRed_0
g-band Response
ID: CAM-REQ-0011
Last Modified: 6/16/2011
Specification: The response relative to the in-band average (as measured between [gLowerBlue_100]
and [gLowerRed_100]) of the g-band filter shall lie between the upper and lower envelopes defined in
the tables below.
Discussion: The target relative g-band response is defined by the nominal parameters below.
1.2.6.1
gResponseNom
Last Modified: 12/3/2010
Description
The nominal g-band zero relative response wavelength on
the blue side.
The nominal g-band 50% relative response wavelength on
the blue side.
The nominal g-band 100% relative response wavelength on
the blue side.
The nominal g-band 100% relative response wavelength on
the red side.
The nominal g-band 50% relative response wavelength on
the red side.
The nominal g-band zero relative response wavelength on
the red side.
Value
Unit
Name
390
nm
gNomBlue_0
402
nm
gNomBlue_50
415
nm
gNomBlue_100
540
nm
gNomRed_100
552
nm
gNomRed_50
565
nm
gNomRed_0
The contents of this document are subject to configuration control and may not be changed, altered, or
their provisions waived without prior approval of the LSST Change Control Board.
2016-02-09
Page 11 of 39
Large Synoptic Survey Telescope
1.2.6.2
Camera Subsystem Specifications
LSE-59
gResponseEnv
Last Modified: 12/3/2010
Description
The lower envelope g-band zero relative response
wavelength on the blue side.
The lower envelope g-band 50% relative response
wavelength on the blue side.
The lower envelope g-band 100% relative response
wavelength on the blue side.
The lower envelope g-band 100% relative response
wavelength on the red side.
The lower envelope g-band 50% relative response
wavelength on the red side.
The lower envelope g-band zero relative response
wavelength on the red side.
The upper envelope g-band zero relative response
wavelength on the blue side.
The upper envelope g-band 50% relative response
wavelength on the blue side.
The upper envelope g-band 100% relative response
wavelength on the blue side.
The upper envelope g-band 100% relative response
wavelength on the red side.
The upper envelope g-band 50% relative response
wavelength on the red side.
The upper envelope g-band zero relative response
wavelength on the red side.
1.2.7
Value
Unit
Name
392
nm
gLowerBlue_0
404
nm
gLowerBlue_50
417
nm
gLowerBlue_100
537
nm
gLowerRed_100
550
nm
gLowerRed_50
562
nm
gLowerRed_0
387
nm
gUpperBlue_0
399
nm
gUpperBlue_50
412
nm
gUpperBlue_100
542
nm
gUpperRed_100
555
nm
gUpperRed_50
567
nm
gUpperRed_0
r-band Response
ID: CAM-REQ-0012
Last Modified: 6/16/2011
Specification: The response relative to the in-band average (as measured between [rLowerBlue_100]
and [rLowerRed_100]) of the r-band filter shall lie between the upper and lower envelopes defined in the
tables below.
Discussion: The target relative r-band response is defined by the nominal parameters below.
1.2.7.1
rResponseNom
Last Modified: 12/3/2010
Description
The nominal r-band zero relative response wavelength on the
blue side.
The nominal r-band 50% relative response wavelength on the
blue side.
The nominal r-band 100% relative response wavelength on
the blue side.
The nominal r-band 100% relative response wavelength on
Value
Unit
Name
540
nm
rNomBlue_0
552
nm
rNomBlue_50
565
nm
rNomBlue_100
679
nm
rNomRed_100
The contents of this document are subject to configuration control and may not be changed, altered, or
their provisions waived without prior approval of the LSST Change Control Board.
2016-02-09
Page 12 of 39
Large Synoptic Survey Telescope
Camera Subsystem Specifications
Description
LSE-59
Value
Unit
Name
691
nm
rNomRed_50
704
nm
rNomRed_0
the red side.
The nominal r-band 50% relative response wavelength on the
red side.
The nominal r-band zero relative response wavelength on the
red side.
1.2.7.2
rResponseEnv
Last Modified: 12/3/2010
Description
The lower envelope r-band zero relative response
wavelength on the blue side.
The lower envelope r-band 50% relative response
wavelength on the blue side.
The lower envelope r-band 100% relative response
wavelength on the blue side.
The lower envelope r-band 100% relative response
wavelength on the red side.
The lower envelope r-band 50% relative response
wavelength on the red side.
The lower envelope r-band zero relative response
wavelength on the red side.
The upper envelope r-band zero relative response
wavelength on the blue side.
The upper envelope r-band 50% relative response
wavelength on the blue side.
The upper envelope r-band 100% relative response
wavelength on the blue side.
The upper envelope r-band 100% relative response
wavelength on the red side.
The upper envelope r-band 50% relative response
wavelength on the red side.
The upper envelope r-band zero relative response
wavelength on the red side.
1.2.8
Value
Unit
Name
542
nm
rLowerBlue_0
555
nm
rLowerBlue_50
567
nm
rLowerBlue_100
676
nm
rLowerRed_100
689
nm
rLowerRed_50
701
nm
rLowerRed_0
537
nm
rUpperBlue_0
550
nm
rUpperBlue_50
562
nm
rUpperBlue_100
681
nm
rUpperRed_100
694
nm
rUpperRed_50
706
nm
rUpperRed_0
i-band Response
ID: CAM-REQ-0013
Last Modified: 6/16/2011
Specification: The response relative to the in-band average (as measured between [rLowerBlue_100]
and [rLowerRed_100]) of the r-band filter shall lie between the upper and lower envelopes defined in the
tables below.
Discussion: The target relative i-band response is defined by the nominal parameters below.
1.2.8.1
iResponseNom
Last Modified: 12/3/2010
Description
Value
Unit
Name
The contents of this document are subject to configuration control and may not be changed, altered, or
their provisions waived without prior approval of the LSST Change Control Board.
2016-02-09
Page 13 of 39
Large Synoptic Survey Telescope
Camera Subsystem Specifications
Description
The nominal i-band zero relative response wavelength on the
blue side.
The nominal i-band 50% relative response wavelength on the
blue side.
The nominal i-band 100% relative response wavelength on
the blue side.
The nominal i-band 100% relative response wavelength on
the red side.
The nominal i-band 50% relative response wavelength on the
red side.
The nominal i-band zero relative response wavelength on the
red side.
1.2.8.2
LSE-59
Value
Unit
Name
679
nm
iNomBlue_0
691
nm
iNomBlue_50
704
nm
iNomBlue_100
806
nm
iNomRed_100
818
nm
iNomRed_50
831
nm
iNomRed_0
iResponseEnv
Last Modified: 12/3/2010
Description
Value
The lower envelope i-band zero relative response wavelength
on the blue side.
The lower envelope i-band 50% relative response wavelength
on the blue side.
The lower envelope i-band 100% relative response
wavelength on the blue side.
The lower envelope i-band 100% relative response
wavelength on the red side.
The lower envelope i-band 50% relative response wavelength
on the red side.
The lower envelope i-band zero relative response wavelength
on the red side.
The upper envelope i-band zero relative response
wavelength on the blue side.
The upper envelope i-band 50% relative response
wavelength on the blue side.
The upper envelope i-band 100% relative response
wavelength on the blue side.
The upper envelope i-band 100% relative response
wavelength on the red side.
The upper envelope i-band 50% relative response
wavelength on the red side.
The upper envelope i-band zero relative response
wavelength on the red side.
1.2.9
Unit
Name
681
nm
iLowerBlue_0
694
nm
iLowerBlue_50
706
nm
iLowerBlue_100
803
nm
iLowerRed_100
816
nm
iLowerRed_50
828
nm
iLowerRed_0
676
nm
iUpperBlue_0
689
nm
iUpperBlue_50
701
nm
iUpperBlue_100
808
nm
iUpperRed_100
821
nm
iUpperRed_50
833
nm
iUpperRed_0
z-band Response
ID: CAM-REQ-0014
Last Modified: 6/16/2011
Specification: The response relative to the in-band average (as measured between [zLowerBlue_100]
and [zLowerRed_100]) of the z-band filter shall lie between the upper and lower envelopes defined in the
tables below.
Discussion: The target relative z-band response is defined by the nominal parameters below.
The contents of this document are subject to configuration control and may not be changed, altered, or
their provisions waived without prior approval of the LSST Change Control Board.
2016-02-09
Page 14 of 39
Large Synoptic Survey Telescope
1.2.9.1
Camera Subsystem Specifications
LSE-59
zResponseNom
Last Modified: 12/3/2010
Description
The nominal z-band zero relative response wavelength on
the blue side.
The nominal z-band 50% relative response wavelength on
the blue side.
The nominal z-band 100% relative response wavelength on
the blue side.
The nominal z-band 100% relative response wavelength on
the red side.
The nominal z-band 50% relative response wavelength on
the red side.
The nominal z-band zero relative response wavelength on
the red side.
1.2.9.2
Value
Unit
Name
806
nm
zNomBlue_0
818
nm
zNomBlue_50
831
nm
zNomBlue_100
910
nm
zNomRed_100
922
nm
zNomRed_50
935
nm
zNomRed_0
zResponseEnv
Last Modified: 12/3/2010
Description
The lower envelope z-band zero relative response
wavelength on the blue side.
The lower envelope z-band 50% relative response
wavelength on the blue side.
The lower envelope z-band 100% relative response
wavelength on the blue side.
The lower envelope z-band 100% relative response
wavelength on the red side.
The lower envelope z-band 50% relative response
wavelength on the red side.
The lower envelope z-band zero relative response
wavelength on the red side.
The upper envelope z-band zero relative response
wavelength on the blue side.
The upper envelope z-band 50% relative response
wavelength on the blue side.
The upper envelope z-band 100% relative response
wavelength on the blue side.
The upper envelope z-band 100% relative response
wavelength on the red side.
The upper envelope z-band 50% relative response
wavelength on the red side.
The upper envelope z-band zero relative response
wavelength on the red side.
1.2.10
Value
Unit
Name
808
nm
zLowerBlue_0
821
nm
zLowerBlue_50
833
nm
zLowerBlue_100
909
nm
zLowerRed_100
921
nm
zLowerRed_50
934
nm
zLowerRed_0
803
nm
zUpperBlue_0
816
nm
zUpperBlue_50
828
nm
zUpperBlue_100
914
nm
zUpperRed_100
926
nm
zUpperRed_50
939
nm
zUpperRed_0
y-band Response
ID: CAM-REQ-0015
Last Modified: 6/16/2011
The contents of this document are subject to configuration control and may not be changed, altered, or
their provisions waived without prior approval of the LSST Change Control Board.
2016-02-09
Page 15 of 39
Large Synoptic Survey Telescope
Camera Subsystem Specifications
LSE-59
Specification: The response relative to the in-band average (as measured between [yLowerBlue_100]
and [yLowerRed_100]) of the y-band filter shall lie between the upper and lower envelopes defined in the
tables below.
Discussion: The target relative y-band response is defined by the nominal parameters below.
1.2.10.1
yResponseNom
Last Modified: 12/3/2010
Description
The nominal y-band zero relative response wavelength on
the blue side.
The nominal y-band 50%relative response wavelength on the
blue side.
The nominal y-band 100%relative response wavelength on
the blue side.
The nominal y-band 100%relative response wavelength on
the blue side.
The nominal y-band 50%relative response wavelength on the
blue side.
The nominal y-band zero relative response wavelength on
the blue side.
1.2.10.2
Value
Unit
Name
918
nm
yNomBlue_0
930
nm
yNomBlue_50
943
nm
yNomBlue_100
INDEF
nm
yNomRed_100
N/A
nm
yNomRed_50
N/A
nm
yNomRed_0
yResponseEnv
Last Modified: 12/3/2010
Description
The lower envelope y-band zero relative response
wavelength on the blue side.
The lower envelope y-band 50%relative response wavelength
on the blue side.
The lower envelope y-band 100%relative response
wavelength on the blue side.
The lower envelope y-band 100%relative response
wavelength on the red side.
The lower envelope y-band 50% relative response
wavelength on the red side.
The lower envelope y-band zero relative response
wavelength on the red side.
The upper envelope y-band zero relative response
wavelength on the blue side.
The upper envelope y-band 50% relative response
wavelength on the blue side.
The upper envelope y-band 100% relative response
wavelength on the blue side.
The upper envelope y-band 100% relative response
wavelength on the red side.
The upper envelope y-band 50% relative response
wavelength on the red side.
The upper envelope y-band zero relative response
wavelength on the red side.
Value
Unit
Name
919
nm
yLowerBlue_0
931
nm
yLowerBlue_50
944
nm
yLowerBlue_100
1057
nm
yLowerRed_100
1069
nm
yLowerRed_50
1082
nm
yLowerRed_0
914
nm
yUpperBlue_0
926
nm
yUpperBlue_50
939
nm
yUpperBlue_100
INDEF
nm
yUpperRed_100
N/A
nm
yUpperRed_50
N/A
nm
yUpperRed_0
The contents of this document are subject to configuration control and may not be changed, altered, or
their provisions waived without prior approval of the LSST Change Control Board.
2016-02-09
Page 16 of 39
Large Synoptic Survey Telescope
Camera Subsystem Specifications
LSE-59
1.3 Dynamic Range
ID: CAM-REQ-0016
Last Modified: 6/16/2011
Specification: The LSST Camera system shall have a single exposure unsaturated dynamic range of at
least [camDynamicRange] above the 5-sigma point source r-band limiting magnitude in a standard 15
second exposure.
Discussion; This requirement is referenced to the fiducial conditions used to define the limiting
magnitude requirements.
1.3.1
dynamicRange
Last Modified: 10/5/2010
Description
Value
The camera minimum dynamic range in a single 15 second
exposure.
8
Unit
Name
ABmag
camDynamicRange
1.4 Image bits per pixel
ID: CAM-REQ-0017
Last Modified: 6/16/2011
Specification: The imaging system shall acquire science data with a bit depth of least
[campixelBitDepth].
1.4.1
CampixelBitDepth
Last Modified: 7/29/2010
Description
Value
Bits per pixel
16
Unit
Name
int
CamPixelBitDepth
1.5 Camera max image quality error
ID: CAM-REQ-0018
Last Modified: 6/16/2011
Specification: The maximum delivered image quality error for the camera shall be less than
[CameraImageQuality] FWHM
Discussion: This is the total image quality error allocation to the camera, from all sources
1.5.1
CameraImageQuality
Last Modified: 5/17/2010
Description
Image quality error (FWHM)
Value
0.30
Unit
Name
ArcsecFW CameraImageQuali
ty
HM
The contents of this document are subject to configuration control and may not be changed, altered, or
their provisions waived without prior approval of the LSST Change Control Board.
2016-02-09
Page 17 of 39
Large Synoptic Survey Telescope
Camera Subsystem Specifications
LSE-59
1.6 Camera lifetime
ID: CAM-REQ-0019
Last Modified: 6/16/2011
Specification: The camera and all subsystems and components shall be designed to operate for at least
[CamLifetime]
Discussion: This includes the observatory lifetime plus additional time for camera integration, test, and
observatory commissioning
1.6.1
CamLifetime
Last Modified: 12/2/2010
Description
Camera lifetime
Value
Unit
Name
15
Years
CamLifetime
1.7 Total system read noise
ID: CAM-REQ-0020
Last Modified: 6/3/2011
Specification: The electronic noise from the LSST Camera system shall contribute no more than
camSysNoise per visit to each pixel in the data from the science sensor array.
Discussion: This top level noise budget includes all sources internal to the camera system that
contribute to the base noise in each pixel, including readout noise, residual noise from dark current,
additional noise in the electronics, etc...
1.7.1
iCamReadNoise
Last Modified: 10/6/2010
Description
Value
Camera read noise per visit
10
Unit
Name
electrons
iCamReadNoise
1.8 Detector pixel pitch
ID: CAM-REQ-0021
Last Modified: 6/16/2011
Specification: The detector nominal pixel pitch shall be [PixelPitch]
Discussion: This corresponds to (0.2 arc-second) sampling
1.8.1
PixelPitch
Last Modified: 5/13/2010
Description
Nominal pixel pitch
Value
10
Unit
Name
micron
PixelPitch
1.9 Radioactive background
The contents of this document are subject to configuration control and may not be changed, altered, or
their provisions waived without prior approval of the LSST Change Control Board.
2016-02-09
Page 18 of 39
Large Synoptic Survey Telescope
Camera Subsystem Specifications
ID: CAM-REQ-0022
LSE-59
Last Modified: 6/16/2011
Specification: Charged particle events from radioactive material in the summit facility shall cause a
background of no more than TBD events/cm^2-sec on the detector plane.
Discussion: Additional work is necessary to derive the allocation from the telescope and camera.
1.10
Electromagnetic Emissions
ID: CAM-REQ-0023
Last Modified: 6/3/2011
Specification: The camera shall not emit electromagnetic radiation on any frequency in accordance with
FCC part 15 Class A standards that significantly interferes with itself, the operation of other observatory
subsystems, or any neighboring facility. The specific thresholds are TBR.
Discussion: This requirement does not mean to imply that the LSST Observatory will pursue formal Part
15 certification, but rather to ensure that the design is robust against causing interference with itself or its
neighbors.
1.11
Electromagnetic Susceptibility
ID: CAM-REQ-0024
Last Modified: 6/16/2011
Specification: The camera shall not be susceptible to electromagnetic emissions consistent with FCC
Part 15 standards and commercial sources within and external to the Summit Facility (TBR)
Discussion: The camera cannot use shielding for RF coming in through L3. A system level analysis
needs to be performed to quantify both performance and damage levels. Camera performance
requirements and observatory mitigation requirements can then be determined.
1.12
Light Emissions
ID: CAM-REQ-0025
Last Modified: 6/3/2011
Specification: Light sources within the camera shall not escape out of the camera or cause camera
performance to go out of specification
2 Camera Optical Design
Last Modified: 6/15/2011
Discussion: The Camera optical prescription is a direct copy of the observatory prescription specified in
the Observatory System Spec (OSS).
The Camera optical prescription is given below with details and performance discussed in document LSE11. The presciption contains parameters to define each surface, their separations, and clear apertures.
All parameters follow the sign conventions used by the Zemax raytracing software.
https://www.lsstcorp.org/docushare/dsweb/Services/LSE-11
2.1 L1 Lens Prescription
ID: CAM-REQ-0026
Last Modified: 6/15/2011
The contents of this document are subject to configuration control and may not be changed, altered, or
their provisions waived without prior approval of the LSST Change Control Board.
2016-02-09
Page 19 of 39
Large Synoptic Survey Telescope
Camera Subsystem Specifications
LSE-59
Specification: The prescription of the L1 lens shall be defined by the table of parameters
[L1LensPrescription]
Discussion: This prescription is a copy of the prescription called out in the Observatory System Spec
(OSS), and defines only nominal values; tolerances on figure and position are derived at a lower level
from image quality requirements
2.1.1
L1LensPrescription
Last Modified: 5/12/2010
Description
Value
The radius of the first surface (s1) of the first lens (L1) shall
be [L1-S1-Radius]
The radius of the second surface (s2) of the first lens (L1)
shall be [L1-S2-Radius].
The center thickness of the first lens (L1) shall be
[L1CenThick]
The first lens (L1) shall be fabricated from [L1GlassType]
The clear aperture radius of the first lens (L1) shall be
[L1OuterCA]
Unit
Name
-2824.0
mm
L1-S1-Radius
-5021.00
mm
L1-S2-Radius
82.23
mm
L1CenThick
Fused
Silica
775
L1GlassType
mm
L1OuterCA
2.2 L2 Lens Presciption
ID: CAM-REQ-0027
Last Modified: 6/15/2011
Specification: The prescription of the L2 lens shall be defined by the table of parameters
[L2LensPrescription]
Discussion: This prescription is a copy of the prescription called out in the Observatory System Spec
(OSS), and defines only nominal values; tolerances on figure and position are derived at a lower level
from image quality requirements
2.2.1
L2LensPresciption
Last Modified: 12/3/2010
Description
Value
The radius of the first surface (S1) of the second lens (L2)
shall be [L2-S1-Radius]
The second surface 6th order aspheric coefficient on the
second lens shall be [L2-S2-6thAsphere].
The second surface (s2) conic constant on the second lens
(L2) shall be [L2-S2Conic].
The radius of the second surface (s2) of the second lens (L2)
shall be [L2-S2-Radius].
The center thickness of the second lens (L2) shall be
[L2CenThick].
The second lens (L2) shall be fabricated from [L2GlassType]
Infinite
The clear aperture radius of the second lens (L2) shall be
[L2OuterCA].
Unit
Name
L2-S1-Radius
L2-S2-6thAsphere
1.656e18
-1.5700
mm^-5
-2529.0
mm
L2-S2-Radius
30.00
mm
L2CenThick
Fused
Silica
551.0
L2-S2Conic
L2GlassType
mm
L2OuterCA
The contents of this document are subject to configuration control and may not be changed, altered, or
their provisions waived without prior approval of the LSST Change Control Board.
2016-02-09
Page 20 of 39
Large Synoptic Survey Telescope
Camera Subsystem Specifications
LSE-59
2.3 Filter Prescription
ID: CAM-REQ-0028
Last Modified: 6/15/2011
Specification: The presciption of the filter substrates shall be defined by the table of parameters
[FilterPrescription]
Discussion: This prescription is a copy of the prescription called out in the Observatory System Spec
(OSS), and defines only nominal values; tolerances on figure and position are derived at a lower level
from image quality requirements
2.3.1
filterPrescription
Last Modified: 12/3/2010
Description
Value
The third lens (L3) shall be fabricated from l3GlassType
Fused
Silica
378.0
mm
filterOuterCa
-5632.0
mm
filter_s1Radius
26.60
mm
filterThick_u
21.50
mm
filterThick_g
17.90
mm
filterThick_r
15.70
mm
filterThick_i
14.4
mm
filterThick_z
13.60
mm
filterThick_y
-5530.0
mm
filter_s2Radius_u
-5576.0
mm
filter_s2Radius_g
-5606.0
mm
filter_s2Radius_r
-5623.0
mm
filter_s2Radius_i
-5632.0
mm
filter_s2Radius_z
-5640.0
mm
filter_s2Radius_y
The clear aperture radius of the filter substrates shall be
filterOuterCa
The radius of the first surface (s1) of the filter substrates shall
be filter_s1Radius
The thicknes of the u-band filter substrate shall be
filterThick_u
The thicknes of the g-band filter substrate shall be
filterThick_g
The thicknes of the r-band filter substrate shall be
filterThick_r
The thicknes of the i-band filter substrate shall be
filterThick_i
The thicknes of the z-band filter substrate shall be
filterThick_z
The thicknes of the y-band filter substrate shall be
filterThick_y
The radius of the second surface (s2) of the u-band filter
substrate shall be filter_s2Radius_u
The radius of the second surface (s2) of the g-band filter
substrate shall be filter_s2Radius_g
The radius of the second surface (s2) of the r-band filter
substrate shall be filter_s2Radius_r
The radius of the second surface (s2) of the i-band filter
substrate shall be filter_s2Radius_i
The radius of the second surface (s2) of the z-band filter
substrate shall be filter_s2Radius_z
The radius of the second surface (s2) of the y-band filter
substrate shall be filter_s2Radius_y
Unit
Name
filterGlassType
2.4 L3 Lens Prescription
ID: CAM-REQ-0029
Last Modified: 6/15/2011
Specification: The prescription of the third lens (L3) shall be defined by the table of parameters
[L3LensPrescription]
Discussion: This prescription is a copy of the prescription called out in the Observatory System Spec
(OSS), and defines only nominal values; tolerances on figure and position are derived at a lower level
The contents of this document are subject to configuration control and may not be changed, altered, or
their provisions waived without prior approval of the LSST Change Control Board.
2016-02-09
Page 21 of 39
Large Synoptic Survey Telescope
Camera Subsystem Specifications
LSE-59
from image quality requirements
2.4.1
L3LensPresciption
Last Modified: 12/3/2010
Description
Value
The first surface (s1) conic constant on the third lens (L3)
shall be [L3-S1Conic].
The radius of the first surface (s1) of the third lens (L3) shall
be [L3-S1-Radius].
The radius of the second surface (s2) of the third lens (L3)
shall be [L3-S2-Radius].
The center thickness of the third lens (L3) shall be
[L3CenThick].
The third lens (L3) shall be fabricated from [L3GlassType].
The clear aperture radius of the third lens (L3) shall be
[L3OuterCA].
Unit
Name
L3-S1Conic
-0.9620
-3169.0
mm
L3-S1-Radius
13360.0
mm
L3-S2-Radius
60.00
mm
L3CenThick
Fused
Silica
361.0
L3GlassType
mm
L3OuterCA
2.5 Camera optics spacings
ID: CAM-REQ-0030
Last Modified: 1/6/2011
Specification: The prescription for the separation of the Camera optical elements shall be defined by the
parameters in table [CameraOpticsSpacings].
Discussion: This prescription is a copy of the prescription called out in the Observatory System Spec
(OSS), and defines only nominal values; tolerances on figure and position are derived at a lower level
from image quality requirements.
2.5.1
CameraOpticsSpacings
Last Modified: 12/3/2010
Description
The distance from the vertex of the second surface of L1 to
the vertex of the first surface of L2 shall be l1_l2Spacing.
The distance from the vertex of the second surface of L2 to
the vertex of the first surface of the filter substrate shall be
L2_filterSpacing.
The distance from the vertex of the second surface of the uband filter substrate to the vertex of the first surface of L3
shall be L3_filterSpacing_u.
The distance from the vertex of the second surface of the gband filter substrate to the vertex of the first surface of L3
shall be L3_filterSpacing_g.
The distance from the vertex of the second surface of the rband filter substrate to the vertex of the first surface of L3
shall be L3_filterSpacing_r.
The distance from the vertex of the second surface of the iband filter substrate to the vertex of the first surface of L3
shall be L3_filterSpacing_i.
Value
Unit
Name
-412.642
mm
l1_l2Spacing
-349.58
mm
l2_filterSpacing
-42.40
mm
l3_filterSpacing_u
-47.50
mm
l3_filterSpacing_g
-51.10
mm
l3_filterSpacing_r
-53.30
mm
l3_filterSpacing_i
The contents of this document are subject to configuration control and may not be changed, altered, or
their provisions waived without prior approval of the LSST Change Control Board.
2016-02-09
Page 22 of 39
Large Synoptic Survey Telescope
Camera Subsystem Specifications
LSE-59
Description
Value
Unit
Name
The distance from the vertex of the second surface of the zband filter substrate to the vertex of the first surface of L3
shall be L3_filterSpacing_z.
The distance from the vertex of the second surface of the yband filter substrate to the vertex of the first surface of L3
shall be L3_filterSpacing_y.
The distance from the vertex of the second surface of L3 to
the focal plane array (FPA) shall be l3_fpaSpacing.
-54.60
mm
l3_filterSpacing_z
-55.40
mm
l3_filterSpacing_y
-28.50
mm
l3_fpaSpacing
2.6 Detector plane+L3+Filter gap adjustability to L2
ID: CAM-REQ-0031
Last Modified: 6/16/2011
Specification: The detector plane + L3 + Filter shall be capable of being adjusted one time by +/[DetL3FilterAdjust] with respect to L2
Discussion: This provides compensation for the as-built figure errors in the mirrors
2.6.1
DetL3FilterAdjust
Last Modified: 5/17/2010
Description
L2 to L3+filter+detector plane spacing adjustability
Value
Unit
Name
5
mm
DetL3FilterAdjust
2.7 Detector plane-L3 gap adjustability
ID: CAM-REQ-0032
Last Modified: 1/6/2011
Specification: The gap between the detector plane and L3 shall be capable of being adjusted one time
by +/- [Det-L3GapAdjust]
Discussion: This provides compensation for the as-built figure errors in the mirrors
2.7.1
Det-L3GapAdjust
Last Modified: 12/2/2010
Description
Detector plane to L3 spacing adjustability
Value
Unit
Name
3.5
mm
Det-L3GapAdjust
3 Camera Stray and Scattered Light
Last Modified: 12/3/2010
3.1 Lens Maximum Reflectance
ID: CAM-REQ-0033
Last Modified: 6/16/2011
Specification: The reflectance of each lens surface shall be less than [lensReflection]
The contents of this document are subject to configuration control and may not be changed, altered, or
their provisions waived without prior approval of the LSST Change Control Board.
2016-02-09
Page 23 of 39
Large Synoptic Survey Telescope
3.1.1
Camera Subsystem Specifications
LSE-59
Maximum lens reflectance
Last Modified: 6/16/2011
Description
Maximum lens surface reflectance
Value
Unit
Name
2
Percent
lensReflection
3.2 Reflective surface treatments
ID: CAM-REQ-0034
Last Modified: 6/16/2011
Specification: Reflective surfaces near the main beam shall either be shielded by light baffles, painted
flat black or treated/shaped to minimize scattering.
3.3 Optical Baffling
ID: CAM-REQ-0035
Last Modified: 4/13/2011
Specification: The camera shall be baffled such that there are no direct specular paths to the focal
plane from celestial sources that are outside the nominal field of view
4 Photometric Requirements
Last Modified: 12/3/2010
4.1 Camera optical throughput variation
ID: CAM-REQ-0036
Last Modified: 6/21/2011
Specification: The maximum variation in camera optical throughput over the entire field of view on the
detector plane shall be < [ThroughputVarOverFOV]
Discussion: Table 7 of SRD drives this requirement. Expect the TBR to be resolved when this
observatory level analysis is complete
4.1.1
ThroughputVarOverFOV
Last Modified: 6/5/2010
Description
Allowed throughput variation over the field of view
Value
10 (TBR)
Unit
Name
Percent
ThroughputVarOve
rFOV
4.2 Exposure duration accuracy
ID: CAM-REQ-0037
Last Modified: 1/6/2011
Specification: The accuracy of the shutter exposure duration shall be <[ExposureDurationAccuracy]
The contents of this document are subject to configuration control and may not be changed, altered, or
their provisions waived without prior approval of the LSST Change Control Board.
2016-02-09
Page 24 of 39
Large Synoptic Survey Telescope
Camera Subsystem Specifications
LSE-59
Discussion: The accuracy is the difference between the actual duration and what was requested
4.2.1
ExposureDurationAccuracy
Last Modified: 6/1/2010
Description
Exposure duration accuracy
Value
Unit
Name
50
m-sec
ExposureDurationA
ccuracy
4.3 Exposure duration repeatability
ID: CAM-REQ-0038
Last Modified: 1/6/2011
Specification: The repeatability of the exposure duration shall be < [ExposureDurationRepeatability]
Discussion: Repeatability is the variation in exposure duration across many exposures
4.3.1
ExposureDurationRepeatability
Last Modified: 6/1/2010
Description
Exposure duration repeatability
Value
Unit
Name
5
m-sec
ExposureDurationR
epeatability
4.4 Exposure duration uniformity
ID: CAM-REQ-0039
Last Modified: 1/6/2011
Specification: The uniformity of the exposure duration for all pixels shall be <
[ExposureDurationUniformity]
Discussion: Uniformity is the variation of actual exposure duration for all pixels on the focal plane
4.4.1
ExposureDurationUniformity
Last Modified: 6/1/2010
Description
Exposure duration uniformity
Value
Unit
Name
5
m-sec
ExposureDurationU
niformity
4.5 Filter positioning for photometric precision
ID: CAM-REQ-0040
Last Modified: 6/3/2011
Specification: The positioning of the filters must be adequately precise and reproducible that there are
no significant errors induced in the photometric quality of the survey data, here defined as <
[FilterPosPhotoError] in addition to survey photometric precision
4.5.1
FilterPosPhotoError
The contents of this document are subject to configuration control and may not be changed, altered, or
their provisions waived without prior approval of the LSST Change Control Board.
2016-02-09
Page 25 of 39
Large Synoptic Survey Telescope
Camera Subsystem Specifications
LSE-59
Last Modified: 6/1/2010
Description
Filter positioning contribution to camera photometric stability
Value
Unit
Name
0.5
mili-Mag
FilterPosPhotoError
4.6 Throughput as-built knowledge
ID: CAM-REQ-0041
Last Modified: 1/6/2011
Specification: The as-built camera throughput shall be measured separately from the telescope with
relative accuracy of [ThroughputOverFOV] over spatial scales of 1 degree on the focal plane
(approximately the size of a raft) for light at normal incidence and in LSST griz bands. The angular
dependence of the throughput shall be measured over the range 14-26 degrees at least at one point on
the focal plane.
Discussion: This is to provide data for use in extraction of dome flat illumination corrections.
4.6.1
ThroughputOverFOV
Last Modified: 6/5/2010
Description
Value
Throughput as built knowledge relative accuracy
0.25
Unit
Name
Percent
ThroughputOverFO
V
4.7 Throughput stability
ID: CAM-REQ-0042
Last Modified: 1/6/2011
Specification: Over an inverval of 12 hours the overall camera throughput shall be controlled or
measured to within [ThroughputStability] RMS.
4.7.1
ThroughputStability
Last Modified: 6/5/2010
Description
Throughput stability contribution to camera photometric
stability
Value
Unit
Name
0.5
mili-Mag
ThroughputStability
5 Guiding
Last Modified: 12/3/2010
5.1 Guide Sensors
ID: CAM-REQ-0043
Last Modified: 6/16/2011
Specification: The camera shall provide guide sensors to support telescope guiding
The contents of this document are subject to configuration control and may not be changed, altered, or
their provisions waived without prior approval of the LSST Change Control Board.
2016-02-09
Page 26 of 39
Large Synoptic Survey Telescope
Camera Subsystem Specifications
LSE-59
Discussion: The requirements for these guide sensors are in the Camera to Telescope Guiding ICD
(LSE-66)
6 Wavefront Sensing
Last Modified: 12/3/2010
6.1 Wavefront Sensor Data
ID: CAM-REQ-0044
Last Modified: 6/15/2011
Specification: For the purposes of archiving and buffering the wavefront sensor imaging data shall be
treated the same as science image data.
6.2 Wavefront Sensors
ID: CAM-REQ-0045
Last Modified: 6/16/2011
Specification: The camera shall provide 4 wavefront sensors located near the corners of the inscribed
square to the 3.5 degree FOV.
Discussion: The wavefront sensor requirements are in the Camera to Telescope Wavefront Sensing ICD
(LSE-67)
7 Camera operations
Last Modified: 12/3/2010
7.1 Camera command and telemetry
Last Modified: 12/5/2010
7.1.1
Commanding from OCS
ID: CAM-REQ-0046
Last Modified: 6/16/2011
Specification: The camera shall support commands from the OCS to power-up and initialize the camera,
to change filters and to take exposures
Discussion: The full list of commands is defined in the OCS to Camera ICD. (LSE-71)
7.1.2
Camera telemetry transfer method
ID: CAM-REQ-0047
Last Modified: 6/16/2011
Specification: The camera shall publish telemetry using the Observatory specified protocol as defined in
the OCS Architecture and Protocol ICD (LSE-70)
The contents of this document are subject to configuration control and may not be changed, altered, or
their provisions waived without prior approval of the LSST Change Control Board.
2016-02-09
Page 27 of 39
Large Synoptic Survey Telescope
7.1.3
Camera Subsystem Specifications
LSE-59
Camera meta-data availability
ID: CAM-REQ-0048
Last Modified: 6/14/2011
Specification: The camera telemetry shall include all required information (metadata) needed for the
scientific analysis of the survey data.
Discussion: This includes metadata to maintain the required photometric precision and accuracy during
operations between daily and periodic calibration
7.1.4
Camera State Notification
ID: CAM-REQ-0049
Last Modified: 6/16/2011
Specification: The camera shall report any changes in its major internal state.
7.1.5
Camera Status
ID: CAM-REQ-0050
Last Modified: 6/15/2011
Specification: The Camera shall assess and report an overall hardware health status for major camera
components.
Discussion: The primary purpose of these status indicators is for the OCS to be able to orchestrate
normal operations and handle out of normal conditions.
7.2 Exposure Control Operations
Last Modified: 5/20/2010
7.2.1
Visit timing
ID: CAM-REQ-0051
Last Modified: 6/15/2011
Specification: The camera shall complete each visit (not including the readout of the last exposure in the
visit) within [CamVisitTiming]
Discussion: This requirement is based on two 15 second exposures per visit.
7.2.1.1
CamVisitTiming
Last Modified: 7/29/2010
Description
Visit duration, not counting readout of the second exposure
7.2.2
Value
Unit
Name
34
Seconds
CamVisitTiming
Bias/zero exposures
ID: CAM-REQ-0052
Last Modified: 1/6/2011
Specification: The camera shall be able to perform bias/zero exposures.
The contents of this document are subject to configuration control and may not be changed, altered, or
their provisions waived without prior approval of the LSST Change Control Board.
2016-02-09
Page 28 of 39
Large Synoptic Survey Telescope
Camera Subsystem Specifications
LSE-59
Discussion: These exposures are taken without any CCD integration time. Otherwise the CCDs are
prepared for an exposure as usual. At the time the shutter would normally open, the CCD readout will
start.
7.2.3
Closed-shutter integration
ID: CAM-REQ-0053
Last Modified: 1/6/2011
Specification: The camera shall be able to perform exposures without opening the shutter
Discussion:
7.2.4
Max exposure duration
ID: CAM-REQ-0054
Last Modified: 1/6/2011
Specification: The camera shall be capable of exposures longer than the nominal duration of 15
seconds, but single image specifications need not be met.
7.2.5
Min exposure duration
ID: CAM-REQ-0055
Last Modified: 6/16/2011
Specification: The camera shall be capable of a minimum exposure duration of [ExposureDuration]
Discussion: The nominal exposure duration is 15 seconds. This requirement does not cover special
exposures required for calibration.
7.2.5.1
MinExposureDuration
Last Modified: 7/21/2010
Description
Minimum exposure duration
Value
Unit
Name
5
Seconds
MinExposureDurati
on
7.3 Science data read-out
Last Modified: 6/16/2011
Discussion: The science data read-out requirements defined below are refined in the DM to Camera ICD
(LSE-68)
7.3.1
Science Image Identifier
ID: CAM-REQ-0056
Last Modified: 6/15/2011
Specification: The camera shall deliver each image with a unique identifier per device per exposure
7.3.2
Cross-talk corrected image data
ID: CAM-REQ-0057
Last Modified: 6/16/2011
The contents of this document are subject to configuration control and may not be changed, altered, or
their provisions waived without prior approval of the LSST Change Control Board.
2016-02-09
Page 29 of 39
Large Synoptic Survey Telescope
Camera Subsystem Specifications
LSE-59
Specification: The camera shall provide cross-talk corrected science pixel data to client subscribers
Discussion: The DM will provide the cross-talk coefficients and correction algorithm as defined in the DM
to Camera ICD (LSE-68)
7.3.3
Raw Image Data
ID: CAM-REQ-0058
Last Modified: 6/16/2011
The camera shall provide raw science pixel data in response to a request for one or more specific images
7.3.4
Persistence of raw data
ID: CAM-REQ-0059
Last Modified: 1/6/2011
Specification: The camera shall persist the raw pixel data for [CamPersist]
7.3.4.1
CamPersist
Last Modified: 6/16/2011
Description
Science data buffer capability
7.3.5
Value
Unit
Name
2
Days
CamPersist
Raw data buffer readout
ID: CAM-REQ-0060
Last Modified: 1/6/2011
Specification: The camera shall be able to transmit the persisted raw data in [PersistReadout] in
parallel with routine observing operations.
7.3.5.1
PersistReadout
Last Modified: 12/2/2010
Description
Science data buffer maximum readout duration
7.3.6
Value
Unit
Name
1
Days
PersistReadout
Wavefront data to DM
ID: CAM-REQ-0061
Last Modified: 6/15/2011
Specification: The camera shall provide wave front data to DM
7.4 Time Reference
Last Modified: 8/26/2010
The contents of this document are subject to configuration control and may not be changed, altered, or
their provisions waived without prior approval of the LSST Change Control Board.
2016-02-09
Page 30 of 39
Large Synoptic Survey Telescope
7.4.1
Camera Subsystem Specifications
LSE-59
Reference clock
ID: CAM-REQ-0062
Last Modified: 6/16/2011
Specification: The reference clock for the camera shall be in International Atomic Time (TAI)
7.4.2
Reference to master clock
ID: CAM-REQ-0063
Last Modified: 8/3/2010
Specification: The camera shall reference times to the observatory wide standard time reference
7.4.3
Time accuracy
ID: CAM-REQ-0064
Last Modified: 6/15/2011
Specification: All time tagged events reported by the camera shall be done with an absolute accuracy
of [CamTimeAbsAcc] with respect to the external time standard.
Discussion: This implies that the observatory master clock is significantly better than this (e.g. absolute
accuracy of 1ms) to allow latency in the various subsystems to meet this requirement.
7.4.3.1
CamTimeAbsAcc
Last Modified: 12/2/2010
Description
Absolute time tag accuracy
7.4.4
Value
Unit
Name
.010
Seconds
CamTimeAbsAcc
Time precision
ID: CAM-REQ-0065
Last Modified: 6/15/2011
Specification: All internal events within the camera shall be recorded with a precision relative to the
master clock of relTime.
7.4.4.1
CamTimePrecision
Last Modified: 12/2/2010
Description
Time tag precision
Value
Unit
Name
.001
Seconds
CamTimePrecision
7.5 Filter Operations
Last Modified: 12/5/2010
7.5.1
Filter swap in place
ID: CAM-REQ-0066
Last Modified: 6/16/2011
The contents of this document are subject to configuration control and may not be changed, altered, or
their provisions waived without prior approval of the LSST Change Control Board.
2016-02-09
Page 31 of 39
Large Synoptic Survey Telescope
Camera Subsystem Specifications
LSE-59
Specification: The internal filter complement of the camera shall be reconfigurable without requiring the
removal of the camera from the telescope.
7.5.2
Filter complement
ID: CAM-REQ-0067
Last Modified: 1/6/2011
Specification: The camera shall accommodate [NumFilters] filters on board the camera at any time
Discussion: This presumes that a filter swap-out for a spare filter requires a daytime access
7.5.2.1
NumFilters
Last Modified: 5/17/2010
Description
Number of on-board filters
7.5.3
Value
Unit
Name
5
int
NumFilters
Filter exchange duration
ID: CAM-REQ-0068
Last Modified: 1/6/2011
Specification: The camera shall require less than [FilterExchangeDuration] to change between any
two filters that are resident inside the camera
Discussion: This duration covers all required camera operations, but does not include any additional
telescope or OCS times
7.5.3.1
FilterExchangeDuration
Last Modified: 5/17/2010
Description
Value
Maximum filter exchange duration
7.5.4
90
Unit
Name
Seconds
FilterExchangeDur
ation
Filter swap-out duration
ID: CAM-REQ-0069
Last Modified: 6/17/2011
Specification: The Camera shall allow for swapping out any of the on-board filters for a new filter during
the day, with a total time to swap out the filter of [FilterSwapOutDuration] after safe access to the
Camera has been established
Discussion: This duration covers all required camera operations and verification tests, but does not
include any additional telescope time needed to access the camera or recover
7.5.4.1
FilterSwapOutDuration
Last Modified: 12/5/2010
Description
Value
Unit
Name
The contents of this document are subject to configuration control and may not be changed, altered, or
their provisions waived without prior approval of the LSST Change Control Board.
2016-02-09
Page 32 of 39
Large Synoptic Survey Telescope
Camera Subsystem Specifications
Description
Maximum filter swap duration
7.5.5
LSE-59
Value
Unit
Name
1.5
Hours
FilterSwapOutDurat
ion
Number of filter exchanges
ID: CAM-REQ-0070
Last Modified: 6/16/2011
Specification: the Camera shall be capable of a total of [dailyFiltChanges] plus [nightlyFiltChanges]
filter changes per day during its design lifetime
7.5.5.1
NumFilterChanges
Last Modified: 12/5/2010
Description
Value
Unit
Name
Daily filter changes
8
int
dailyFiltChanges
Nightly filter changes
4
int
nightlyFiltChanges
7.5.6
Number of filter swap-outs
ID: CAM-REQ-0071
Last Modified: 6/16/2011
Specification: For design purposes the number of monthly filter swaps shall be at least
[monthlyFiltSwaps].
7.5.6.1
NumManualFilterChanges
Last Modified: 6/16/2011
Description
Value
Maximum number of manual filter swaps per month
2
Unit
Name
int
monthlyFiltSwaps
7.6 Camera Power-on
ID: CAM-REQ-0072
Last Modified: 6/16/2011
Specification: Upon activation, the camera shall be able to initialize itself and be ready for
communication with the OCS without further human intervention. This activation process shall take less
than [CamActivationTime].
Discussion: This does not place any requirements the camera in terms of being ready to take data. For
example, the Camera cool down (which requires activation) will take considerable longer than the
specified activation time.
This requirement assumes a warm restart or activation with the appropriate computer(s) up and running.
7.6.1
CamActivationTime
Last Modified: 8/3/2010
The contents of this document are subject to configuration control and may not be changed, altered, or
their provisions waived without prior approval of the LSST Change Control Board.
2016-02-09
Page 33 of 39
Large Synoptic Survey Telescope
Camera Subsystem Specifications
Description
Value
Camera activation time
1
LSE-59
Unit
Name
Minute
CamActivationTime
7.7 Camera Initialization
ID: CAM-REQ-0073
Last Modified: 6/15/2011
Specification: The camera at power up shall be initialized into a known safe state without human
intervention
7.8 Camera Stand-alone Operations
ID: CAM-REQ-0074
Last Modified: 6/15/2011
Specification: The camera shall maintain technical health, safety and status without any other
subsystem operational
7.9 Camera Engineering and Maintenance
ID: CAM-REQ-0075
Last Modified: 6/15/2011
Specification: The camera shall support operations necessary for engineering and maintenance
7.10
Remote Operation Capabilities
ID: CAM-REQ-0076
Last Modified: 6/16/2011
Specification: The camera shall be remotely operable from any of the LSST Facilities or other Project
designated site (e.g. SLAC for camera troubleshooting), subject to cyber security policy. A local operator
shall be always available to regain local control when conditions or safety considerations merit.
Discussion: This provides the opportunity to establish a single operations center for the various functions
of Data Management. Note that cyber security policies must be enforced
7.11
Camera Scheduled Maintenance
ID: CAM-REQ-0077
Last Modified: 6/15/2011
Specification: The camera shall contribute no more than [CamMaintenanceTime] of observatory
downtime due to planned maintenance requirements
Discussion:
7.11.1
CamMaintenanceTime
Last Modified: 12/5/2010
Description
Maximum scheduled maintenance per year
Value
7
Unit
Name
Days
CamMaintenanceTi
me
The contents of this document are subject to configuration control and may not be changed, altered, or
their provisions waived without prior approval of the LSST Change Control Board.
2016-02-09
Page 34 of 39
Large Synoptic Survey Telescope
7.12
Camera Subsystem Specifications
LSE-59
Maintenance Recommendations
ID: CAM-REQ-0078
Last Modified: 6/15/2011
Specification: The camera team shall provide a preventive maintenance program to the Observatory
7.13
Camera unscheduled downtime
ID: CAM-REQ-0079
Last Modified: 1/6/2011
Specification: The camera shall contribute no more than [CamDowntime] (TBD) of observatory
downtime due to unplanned camera failures or unplanned maintenance requirements
Discussion:
7.13.1
CamDowntime
Last Modified: 12/5/2010
Description
Maximum unplanned downtime per year
7.14
Value
Unit
Name
TBD
Days
CamDowntime
Number of shutter actuations
ID: CAM-REQ-0080
Last Modified: 6/21/2011
Specification: The camera shall be designed for nRawExpYear shutter actuations per year.
Discussion: Includes science and calibration exposures as defined in OSS-REQ-0190 and -0323
7.14.1
nRawExpYear
Last Modified: 12/5/2010
Description
Minimum number of raw science exposures required to be
supported by the LSST Observatory over the course of a
single year
7.15
Value
Unit
Name
750000
int
nRawExpYear
Safety System
ID: CAM-REQ-0081
Last Modified: 6/15/2011
Specification: The camera shall implement a non-software based safety system in areas where injury or
harm to personnel and or equipment can occur
7.16
Baseline Performance
ID: CAM-REQ-0082
Last Modified: 6/16/2011
Specification: The camera shall provide the initial baseline performance as determined during
The contents of this document are subject to configuration control and may not be changed, altered, or
their provisions waived without prior approval of the LSST Change Control Board.
2016-02-09
Page 35 of 39
Large Synoptic Survey Telescope
Camera Subsystem Specifications
LSE-59
acceptance testing and system integration and test.
Discussion: The baseline analysis is a deliverable of the subsystem and will be part of the acceptance
process. It is expected that over time the observatory staff will modify and add to the analysis as
knowledge of the subsystems improves.
7.17
Trend analysis
ID: CAM-REQ-0083
Last Modified: 6/16/2011
Specification: The camera shall provide a telemetry trend analysis specific to the camera design using
the provided toolkit
Discussion: It is expected that over time the observatory staff will modify and add to the analysis as
knowledge of the subsystems improves.
8 Camera Environmental Requirements
Last Modified: 12/3/2010
8.1 Normal Operations
ID: CAM-REQ-0084
Last Modified: 6/3/2011
Specification: The camera shall meet performance requirements under normal operating conditions as
defined in table normEnvironment.
8.1.1
normEnvironment
Last Modified: 6/3/2011
Description
The mean temperature for normal operations at the summit
shall be normTempMean.
The minimum temperature for normal operations at the
summit shall be normTempMin.
The maximum temperature for normal operations at the
summit shall be normTempMax.
The rate of change for design purposes shall be
normTempGrad.
When design considerations require operational wind
specifications all summit based systems shall use the
extreme operational wind speed, normWindMax.
When design considerations require humidity specifications
all summit based systems shall use the normal maximal
operational relative humidity (non-condensing)
normHumidityMax
When design considerations require humidity specifications
all summit based systems shall use the normal mean
operational relative humidity (non-condensing)
normHumidityMean.
When design considerations require barometric pressure
Value
Unit
Name
11.5
Celsius
normTempMean
-3.0
Celsius
normTempMin
19.0
Celsius
normTempMax
0.7
C/Hour
normTempGrad
12
m/sec
normWindMax
90
Percent
normHumidityMax
40
Percent
normHumidityMean
749.3
milibar
normBaroMean
The contents of this document are subject to configuration control and may not be changed, altered, or
their provisions waived without prior approval of the LSST Change Control Board.
2016-02-09
Page 36 of 39
Large Synoptic Survey Telescope
Camera Subsystem Specifications
Description
specifications all summit based systems shall use the mean
pressure normBaroMean.
The maximum barometric pressure for normal operations at
the summit shall be normBaroMax (TBR).
The minimum barometric pressure for normal operations at
the summit shall be normBaroMax (TBR).
LSE-59
Value
Unit
Name
786.8
milibar
normBaroMax
711.8
milibar
normBaroMin
8.2 Marginal Condition Operations
ID: CAM-REQ-0085
Last Modified: 6/16/2011
Specification: The camera shall operate under marginal operating conditions as defined in table
marginalEnvironment, but need not meet specification.
8.2.1
marginalEnvironment
Last Modified: 6/3/2011
Description
The temperature rate of change for degraded operations is
marginalTempGradient
The maximum temperature for degraded operations at the
summit shall be marginalTempMax.
The minimum temperature for degraded operations at the
summit shall be marginalTempMin.
the summit shall be marginalWind
Value
Unit
Name
2.0
C/Hour
30
Celsius
marginaltempGradi
ent
marginalTempMax
-5
Celsius
marginalTempMin
20
m/sec
marginalWind
8.3 Survival Condition Operations
ID: CAM-REQ-0086
Last Modified: 6/3/2011
Specification: The camera shall survive the survival conditions as defined in table
survivalEnvironment, but need not be operating.
8.3.1
survivalEnvironment
Last Modified: 6/3/2011
Description
All equipment on the summit must be capable of surviving a
maximum humidity of survivalHumidity without damage.
All equipment located on the summit must be capable of
surviving an ambient air temperature of
survivalTemperature.
The equipment in the interior of the Summit Facility must be
capable of surviving an exterior 10-second wind gust speed
of survivalWindGust.
The equipment in the interior of the Summit Facility must be
capable of surviving a constant wind speed of survivalWind.
Value
Unit
Name
100
Percent
survivalHumidity
-10
Celsius
survivalTemperatur
e
25
m/sec
survivalWindGust
25
m/sec
survivalWind
The contents of this document are subject to configuration control and may not be changed, altered, or
their provisions waived without prior approval of the LSST Change Control Board.
2016-02-09
Page 37 of 39
Large Synoptic Survey Telescope
Camera Subsystem Specifications
LSE-59
8.4 Transportation Condition Design
ID: CAM-REQ-0087
Last Modified: 6/3/2011
Specification: The camera and shipping container shall be designed to withstand the transportation
conditions as defined in table Transportation/Shipping.
8.4.1
Transportation/Shipping
Last Modified: 6/3/2011
Description
Value
During transportation, the altitude can change between sea
Sea level
level and 2700m.
to 2700m
The ambient temperature range is between -15C to +30C for
-15C to
transportation to the summit
+40C
The relative humidity range is from 10% to 100% with
10% to
condensation for transportation to the summit
100%
Wind speed may reach up to 45m/s during transportation to
45
the summit
Pressure will change during transportation to the summit from 1000 to
1000mbar at sea level down to 750mbar at the summit
750
Containers have to be designed to limit dust, sand and insect
access during transportation
Dirt roads will be used during transportation to the summit
16
with grades up to 16%
During transportation to the summit, some roads have vehicle
TBD
weight restrictions.
Gross Vehicle Weight GVW = TBD
Weight/axle = TBD
The container dimensions are limited by the Puclaro Dam
9
tunnel located on the road between La Serena and the
summit.
Unit
Name
Meters
Altitude
Celcius
m/sec
Temperature
Range
Relative Humidity
Range
Wind Speed
milibar
Pressure
Percent
Dirt
Percent
Roads
kg
GVW
Meters
Tunnel
8.5 Seismic Design
ID: CAM-REQ-0088
Last Modified: 6/3/2011
Specification: The camera shall be designed to withstand the specified seismic loads as defined in table
SeismicParameters
8.5.1
SeismicParameters
Last Modified: 6/3/2011
Description
All Summit Facilities and equipment not permanently
attached to bedrock shall be design to loads generated from
a peak design acceleration of at least seismicDesignAccel.
The vertical accelerations used shall match the horizontal
accelerations. The seismic design acceleration
seismicDesignAccel includes the effects of the peak ground
acceleration, damping and resonance effects.
Value
Unit
Name
0.8
g
seismicDesignAcce
l
The contents of this document are subject to configuration control and may not be changed, altered, or
their provisions waived without prior approval of the LSST Change Control Board.
2016-02-09
Page 38 of 39
Large Synoptic Survey Telescope
Camera Subsystem Specifications
LSE-59
9 Standards
Last Modified: 12/3/2010
9.1 Component Standards
ID: CAM-REQ-0089
Last Modified: 6/16/2011
Specification: The camera shall comply with component and procedure standards defined in the LSST
System Standards document (LSE-xx)
9.2 Electrical and control standards
ID: CAM-REQ-0090
Last Modified: 6/16/2011
Specification: The camera shall comply with the Summit Facility electrical and controls standards
(Document-TBD)
9.3 Cyber Security
ID: CAM-REQ-0091
Last Modified: 6/3/2011
Specification: The camera shall comply with funding agency requirements for cyber security based on a
low-low threat assessment
9.4 Health
ID: CAM-REQ-0092
Last Modified: 6/15/2011
Specification: The camera shall be compliant with the Camera Performance and Safety Assurance Plan
(LCA-138)
9.5 Safety
ID: CAM-REQ-0093
Last Modified: 6/15/2011
Specification: The camera shall comply with the LSST Safety Policy (LPM-18) and Hazard Analysis and
Safety Practices (LPM-49)
9.6 Software Standards
ID: CAM-REQ-0094
Last Modified: 6/3/2011
Specification: The camera shall be compliant with the observatory software standards (Document TBD)
The contents of this document are subject to configuration control and may not be changed, altered, or
their provisions waived without prior approval of the LSST Change Control Board.
2016-02-09
Page 39 of 39