Project Documentation
Document DL-SPEC-0002
Revision B
Diffraction-Limited Near-IR Spectropolarimeter
Design Requirements Document
Haosheng Lin, Pei Huang, Helen McGregor, Garry Nitta, Peter Onaka, and Hubert
Yamada
Institute for Astronomy, University of Hawaii
March 12, 2013
Advanced Technology Solar Telescope
950 N. Cherry Avenue
Phone 520-318-8102
atst@nso.edu
http://atst.nso.edu
Tucson, AZ 85719
Fax 520-318-8500
DL-NIRSP DRD
REVISION SUMMARY:
Date: 3/12/2013
Revision: B
Creation of CDP working document from PDR version
Date: 6/10/11 8:49 PM
Revision: A
Changes: PDR version
DL-SPEC-0002, Revision A
Page 2 of 41
DL-NIRSP DRD
Table of Contents
1
REQUIREMENTS OVERVIEW .......................................................... 5
1.1
SCOPE OF THE DOCUMENT .............................................................................. 5
1.2 RELATED DOCUMENTS ..................................................................................... 5
1.2.1 RELATED ATST PROJECT DOCUMENTS ................................................................... 5
1.2.2 INTERFACE CONTROL DOCUMENTS AND DRAWINGS .................................................. 5
1.3
SPECIFIC DEFINITIONS AND TERMINOLOGY .................................................. 6
2
INSTRUMENT DESCRIPTION ........................................................... 7
2.1
SYSTEM OVERVIEW ........................................................................................... 7
2.2
CAMERA SYSTEMS............................................................................................. 7
2.3
MODE OF OPERATION ....................................................................................... 7
2.4 FEED OPTICS ...................................................................................................... 7
2.4.1 FEED OPTICS MODE OF OPERATION ......................................................................... 7
2.5
CONTEXT IMAGER .................................. ERROR! BOOKMARK NOT DEFINED.
2.6
FIBER-OPTIC INTEGRAL FIELD UNIT .... ERROR! BOOKMARK NOT DEFINED.
2.7 SPECTROPOLARIMETERS ................................................................................. 8
2.7.1 SPECTROGRAPH ..................................................................................................... 8
2.7.2 POLARIMETERS ...................................................................................................... 8
3
INSTRUMENT DESCRIPTION ........................................................... 9
3.1
INSTRUMENT SCIENCE REQUIREMENT DOCUMENT SPEC-0067 ................. 9
CONTEXT IMAGING, REGISTRATION AND GUIDING.............................................. 9
3.2
DL-NIRSP OPERATIONAL CONCEPTS DEFINITION (DL-NIRSP-SPEC-0001) ..
............................................................................................................................ 10
3.3 INTERCONNECTS AND SERVICES SPECIFICATION DOCUMENT (SPEC0063) ............................................................................................................................ 10
3.4
SPARE POLICY (SPEC-0041) ........................................................................... 13
3.5 GENERAL SPECIFICATIONS FOR THE DESIGN AND FABRICATION OF
ATST (SPEC-0070)....................................................................................................... 13
3.6
SOFTWARE AND CONTROLS REQUIREMENTS (SPEC-0005) ...................... 15
3.7 INSTRUMENT CONTROL SYSTEM SPECIFICATION DOCUMENT (SPEC0023) ............................................................................................................................ 16
4
DERIVED REQUIREMENTS & SPECIFICATIONS .......................... 17
4.1
4.1.1
4.1.2
4.1.3
OPTICAL SYSTEM ............................................................................................. 17
RMS WAVEFRONT ERROR < 70 NM ....................................................................... 17
LOCATION ............................................................................................................ 17
FEED OPTICS ....................................................................................................... 17
DL-SPEC-0002, Revision A
Page 3 of 41
DL-NIRSP DRD
4.1.4
4.1.5
4.1.6
4.1.7
4.1.8
FIELD SCANNING MIRROR...................................................................................... 19
CONTEXT IMAGER ................................................................................................. 19
FIBER-OPTIC INTEGRAL FIELD UNIT ....................................................................... 20
SPECTROGRAPH ................................................................................................... 21
POLARIMETERS .................................................................................................... 22
4.2 CONTROL SYSTEM ........................................................................................... 24
4.2.1 GENERAL REQUIREMENTS ..................................................................................... 24
4.2.2 FUNCTION REQUIREMENTS .................................................................................... 26
4.2.3 SYSTEM ACTIONS ................................................................................................. 27
4.2.4 SYSTEM SETTING REQUIREMENTS.......................................................................... 29
4.2.5 DL-NIRSP SPECIFIC TO TELESCOPE INTERACTION REQUIREMENTS .......................... 29
4.2.6 SYSTEM MODES REQUIREMENTS ........................................................................... 30
4.2.7 MECHANISM CONTROL REQUIREMENTS .................................................................. 33
4.2.8 INTERFACE REQUIREMENTS ................................................................................... 35
4.2.9 SYSTEM PERFORMANCE REQUIREMENTS ................................................................ 35
4.2.10 MAINTAINABILITY REQUIREMENTS .......................................................................... 36
4.2.11 DOCUMENTATION REQUIREMENTS.......................................................................... 37
4.3
4.3.1
4.3.2
4.3.3
4.3.4
4.3.5
DATA HANDLING REQUIREMENTS ................................................................. 37
USAGE OF ATST DATA HANDLING SYSTEM ............................................................ 37
DATA VOLUME...................................................................................................... 38
DETAILED DISPLAY PLUG-IN .................................................................................. 38
DATA PROCESSING PLUG-INS ................................................................................ 38
METADATA ........................................................................................................... 39
4.4
CAMERA SYSTEM ............................................................................................. 39
5
GENERAL REQUIREMENTS .......................................................... 40
5.1
RELIABILITY ...................................................................................................... 40
5.2
MAINTAINABILITY ............................................................................................. 40
5.3
COMMONALITY OF DESIGNS .......................................................................... 40
5.4
CONDITIONS OF USE........................................................................................ 40
5.5
FACILITY SERVICES INTERFACE .................................................................... 41
5.6
INTERFACES ..................................................................................................... 41
5.7
GENERAL DESIGN REQUIREMENTS .............................................................. 41
5.8
ELECTRICAL SYSTEM REQUIREMENTS ........................................................ 41
5.9
GENERAL FABRICATION REQUIREMENTS ................................................... 41
5.10 SPARES.............................................................................................................. 41
5.11 ENVIRONMENTAL REQUIREMENTS ............................................................... 41
DL-SPEC-0002, Revision A
Page 4 of 41
DL-NIRSP DRD
REQUIREMENTS OVERVIEW
1
1.1 Scope of the Document
This document flows down the Instrument Science Requirements document into detailed design
requirements to facilitate the final design of the instrument.
1.2 Related Documents
SPEC-0001 - ATST Science Requirements Document
SPEC-0067 - Instrument Science Requirements Document
1.2.1
Related ATST Project Documents
SPEC-0012 - ATST Acronym List and Glossary
SPEC-0013 - Software Concepts Definitions
SPEC-0014 - Software Design
SPEC-0022 - Software Users’ Manual
SPEC-0023 - ICS Specification
SPEC-0036 - Operational Concepts Definition
SPEC-0070 - ATST Standard Environmental Conditions
ICD 1.1 / 3.1.3 Telescope Mount Assembly to Coudé Station
1.2.2




Interface Control Documents and Drawings
ICD-1.3/3.4.1 TEOA to DL-NIRSP
ICD-3.1.3/3.4.1 Coudé Station to DL-NIRSP
ICD-3.1.4/3.4.1 ICS to DL-NIRSP
ICD-3.4.1/3.6.1 DL-NIRSP to Camera System
DL-SPEC-0002, Revision A
Page 5 of 41
DL-NIRSP DRD
1.3 Specific Definitions and Terminology
Acronym
Meaning
BS
Beam Splitter
DLCI
DL-NIRSP Context Imager
DLF
DL-NIRSP Feed Optics
DLSG
DL-NIRSP Spectrograph
DWDM
Dense Wavelength Division and Multiplexing
FM
Fold Mirror
FSM
Field Scanning Mirror
IFU
Integral Field Unit
FW
Filter Wheel
GT
Grating Turret
OAM
Off-Axis Mirror
OAP
Off-Axis Parabola
SM
Spherical Mirror
SMA
Slit Mask Assembly
SW
Slit Wheel
DL-SPEC-0002, Revision A
Page 6 of 41
DL-NIRSP DRD
2 INSTRUMENT DESCRIPTION
2.1 System Overview
The DL-NIRSP will be a true-imaging multi-wavelength, diffraction grating based spectropolarimeter
designed for study of the static and dynamic properties of solar magnetism with high spatial, spectral, and
temporal resolution over a 2D field of view, and simultaneously at up to three spectral lines between 500
and 2500 nm wavelength range. The instrument is consisted of four major subsystems, namely (1) the
feed optics, (2) the high-resolution fiber-optic Integral Field Unit (IFU), (3) the coronal IFU, and (4) the
spectropolarimeter.
2.2 Camera Systems
The baseline IR camera system for the final design is based on the substrate-removed HAWAII-2RG-18
(H2RG) focal plane arrays (FPA) with 2500 nm cutoff. Two H2RG cameras are needed. An additional
camera sensitive in the visible wavelength range, from 380 nm to 1,000 nm, is needed to cover the visible
part of the spectrum.
2.3 Fiber-Optic Integral Field Unit
DL-NIRSP will be equipped with two fiber-optic IFUs for true-imaging spectropolarimetry.
2.4 Mode of Operation
DL-NIRSP will support two modes of operation:
1. True-imaging mode with fiber-optic integral field unit (IFU), and
2. Large-field mosaic mode using field scanning mirror to cover field larger than the unit IFU field.
These two modes of operation will be supported without major change in the optical configuration of the
whole system.
2.5 Feed Optics
DL-NIRSP will be equipped with a dual-resolution/FOV feed optics system. The high-resolution feed
provides a high-resolution image to the spectrograph but only with a limited FOV coverage. The medium
resolution mode feed optics will provide an image with a large field of view at a medium resolution.
2.5.1
Feed Optics Mode of Operation
The feed optics will be capable of providing light feed to either the input array of the high-resolution IFU
or the coronal IFU at a separate physical location.
DL-SPEC-0002, Revision A
Page 7 of 41
DL-NIRSP DRD
2.6 Spectropolarimeters
2.6.1
Spectrograph
The spectrograph is a diffraction-grating based spectrograph. It is consisted of 1) a multiple-slit, multiplewavelength high-resolution spectrograph, which disperses the incident sunlight into spectra, 2) a beamsplitting system which separates the output beam of the spectrograph into three wavelength ranges, and 3)
three relay optical system that relay the spectral images provided by the beam-splitting system to their
final focal plane. Wavelength-specific optics for the instrument is located within the relay optics systems.
2.6.1.1 Spectrograph Mode of Operation
The spectrograph will be capable of accepting light feed from either the exit arrays of the high-resolution
IFU or from the exit array of the coronal IFU at a separate physical location.
2.6.2
Polarimeters
DL-NIRSP will be equipped with a broadband polarimeter. It consists of 1) a polarimeter, which performs
the separation of the polarization state of the incident sunlight, and 2) a camera system to record the
polarized spectra provided by the polarimeter and the spectrograph.
For operation in the true-imaging mode using fiber-optic IFU, DL-NIRSP will utilize a single broadband
polarimeter system upstream of the IFU provided by the facility. Alternatively a dedicated broadband
polarimeter located immediately in front of the input array of the IFU can be used.
DL-SPEC-0002, Revision A
Page 8 of 41
DL-NIRSP DRD
3 INSTRUMENT DESCRIPTION
This section is to address any requirements the overall assembly itself may have, that are not covered in
the subassembly requirements in the following section.
3.1 Instrument Science Requirement Document SPEC-0067
Reference
Description
Requirement
Goal
Source (section)
ISRD-1
ISRD-2
ISRD-3
Spectral Coverage
Spectral Resolving Power
Spatial Sampling Diffraction
Limited
900nm - 2300nm
50,000 - 2x105
0.057 arcsec pixel size
G: 0.029 arcsec/pixel
500nm-2500nm
Science
Science
Science
ISRD-4
Spatial Field of View
2 arcmin at 0.057
arcsec/pixel sampling
Science
ISRD-5
Multiple-Slit Capability
Science
4.1.7.3
ISRD-6
True 2-D Imaging
Spectropolarimetry
Capability
8 slits (with 2048x2048
FPA)
IFU with 2048 spatial
sampling elements
3 arcmin2 at
0.029
arcsec/pixel
sampling
10 slits
Science
4.1.3.7,
4.1.6,
4.1.7.2
ISRD-7
ISRD-8
Polarimetric Accuracy
Calibration Optics
Polarimetric Accuracy
Temporal, Spatial and
Spectral Modulation
Better than 5x10-4 Ic
5x10-4 Ic
IFU
with
>
10,000 spatial
sampling
elements
5x10-5
5x10-5 Ic
Science
Science
4.1.8.4
4.1.8.3
Science
4.1.8
3
Science
4.1.7
Science
4.1.2
Science
4.1.2
Science
4.1.2
Science
4.1.2
ISRD-15
Multi-Wavelength
simultaneous Observations
Simultaneous Operation with
the Visible Polarimeter
Simultaneous Operation with
the Visible Tunable Filter
Simultaneous Operation with
the Visible Broadband Imager
Simultaneous Operation with
the AO System
Slit Width
<10 sec
wavelength
change
5
Science
4.1.7.4
ISRD-16
Scanning Unit
Science
4.1.4
ISRD-17
Context imaging, Registration
and guiding
2 arcmin with a step size
of /2D at 900 nm
Context imager sampling
at full resolution with
partial field of view of the
spectrograph and 4
selectable wavelengths
between 900 nm and
2500 nm
Science
4.1.5
ISRD-9
ISRD-10
ISRD-11
ISRD-12
ISRD-13
ISRD-14
DL-SPEC-0002, Revision A
Dual beam with at least
10 Hz modulation
Flexible setup to allow
different configurations
Flexible setup to allow
different configurations
Flexible setup to allow
different configurations
Simultaneous operation
with the AO system
/2D at 900 nm for
diffraction limited
sampling
Slit width and
step size 4
times
oversampling
3 arcmin
DRD
section
4.1.1
4.1.7.5
4.1.3.2,
4.1.3.3,
4.1.3.4
4.1.3.4,
4.1.3.5
Page 9 of 41
DL-NIRSP DRD
3.2 DL-NIRSP Operational Concepts Definition (DL-NIRSP-SPEC-0001)
Reference
OCD-1
Description
TBD
Requirement
Goal
Source (section)
DRD
3.3 Interconnects and Services Specification Document (SPEC-0063)
Reference
S63-1
Description
Electrical
S63-2
Electrical power
S63-3
Electrical power
S63-4
Electrical power
S63-5
Electrical power
S63-6
Electrical power
S63-7
Electrical power
S63-8
Electrical power
S63-9
Electrical power
S63-10
Electrical power
S63-11
Electrical power
S63-12
EMI
S63-13
EMI
S63-14
ESD immunity
DL-SPEC-0002, Revision A
Requirement
Assembly designed to
allow removal and
restoration of power
without requirements
on other subsystems
such as rebooting
Must have overcurrent protection
Fuses shall be easily
accessible for
replacement
Shall have a main line
circuit breaker/power
switch
Controlled light
indicator for power
status
Shall comply with
latest release of
National Electrical
Code
All power and signal
cables and leads shall
be shielded, from low
and high-frequency
interference
UPS and normal
power shall not be
installed in the same
breaker panel
A mechanical
disconnect shall be
provided wherever a
power bus feeds a
utility breaker panel
All circuits and subpanels shall feed from
the breaker panel
using rigid and/or flex
EMT conduit
All circuits shall be
wired directly or use
3-wire duplex and
twist locks duplex
outlets
All subsystems shall
minimize EMI in every
part of the design
Coudé lab electronic
equipment shall
comply with FCC Reg.
part 15, Class B
(TBC)
All electronic equip
shall meet IEC 10004-2
Goal
Source (section)
Engineering
DRD
5.5
Engineering
5.5
Engineering
5.5
Engineering
5.5
Engineering
5.5
Engineering
5.5
Engineering
5.5
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5.5
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5.5
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5.5
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5.5
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5.5
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5.5
Engineering
5.5
Page 10 of 41
DL-NIRSP DRD
S63-15
RFI immunity
S63-16
Power-line disturbances
immunity
S63-17
Electrical fast transient
immunity
S63-18
Surges immunity
S63-19
Grounding
S63-20
Grounding
S63-21
Connectors
S63-22
Connectors
S63-23
Connectors
S63-24
Connectors
S63-25
Connectors
S63-26
Connectors
S63-27
Connectors
S63-28
Connectors
S63-29
Connectors
S63-30
Connectors
S63-31
Connectors
S63-32
Connectors
S63-33
Connectors
DL-SPEC-0002, Revision A
All electronic equip
shall meet IEC 10004-3 and IEC 1000-4-6
All electronic equip
shall meet IEC 10004-9 and IEC 1000-413
All electronic equip
shall meet IEC 10004-4
All electronic equip
shall meet IEC 10004-5
All electronic equip
shall have Safety
Grounds
UPS outlets shall use
orange colored 3-wire
duplex outlets and
shall be tied to GND2
(UPS ground)
All electrical
connectors, cabling,
tubing provided shall
be consistent with
high reliability
operation and EMC
constraints
Connectors shall be
capable of being
rapidly disconnected
for servicing
Connectors shall be
sized so that they
cannot be locally
connected incorrectly
Proper and
appropriate strain
relief shall be
provided
High quality roughservice connectors
shall be used
120 V 3 pin 15A and
20A duplex sockets,
Wall (white), Plug
Strips (Black)
120V UPS – 3 pin
20A duplex sockets,
All (orange)
208 V 3P – 3 prong
30A, twist lock (Black)
MS (threaded)
connectors used for
power
MS (bayonet)
connectors used for
control connections
Back shells and cable
clamps with strain
relief boots shall be
used
Connectors shall be
spaced 2X shell
diameter
One side of the
connectors shall be
ridged and the other
side flexible
Engineering
5.5
Engineering
5.5
Engineering
5.5
Engineering
5.5
Engineering
5.5
Engineering
5.5
Engineering
5.5
Engineering
5.5
Engineering
5.5
Engineering
5.5
Engineering
5.5
Engineering
5.5
Engineering
5.5
Engineering
5.5
Engineering
5.5
Engineering
5.5
Engineering
5.5
Engineering
5.5
Engineering
5.5
Page 11 of 41
DL-NIRSP DRD
S63-34
Connectors
S63-35
Connectors
S63-36
Connectors
S63-37
Connectors
S63-38
Cables
S63-39
Cables
S63-40
Cables
S63-41
Cables
S63-42
Cables
S63-43
Racks
S63-44
Thermal Design
S63-45
Thermal Design
S63-46
Thermal Design
S63-47
Thermal Design
S63-48
Reliability and Lifetime
S63-49
Reliability and Lifetime
DL-SPEC-0002, Revision A
All connections shall
be mounted such that
they are physically
accessible
Connector spacing
must be such that a
gloved hand can
install and remove it
Connectors shall be
unique to avoid
improper connection
during maintenance
Keyed pin/socket
groups must be
approved by AURA
If possible power and
signal wires shall be
routed separately
Ground loops shall be
avoided
Strain reliefs at all
disconnects and end
points
All power and signal
cables shall be clearly
and permanently
labeled at both
terminations
The labeling system
shall be easily
traceable through the
system schematics
All electronic racks
containing heat
generating equipment,
unless otherwise
approved by AURA,
shall be Liebert XDTM
System water-based
cooled racks (TBC)
Components shall not
dissipate more than
20W to the
environment
Insulation shall be of a
non-deteriorating
type, modular and
easily removable and
replaceable
Where overheating
can occur, thermal
sensors shall be
secured within the
insulation and
monitored as a status
signal to the LIC and
a local control system
All equipment that is
cooled shall be
designed such that
there is no
condensation
All systems shall be
designed to exceed
50 (TBC) year lifetime
Due consideration of
fatigue shall be given
to the components
subject to stress
Engineering
5.5
Engineering
5.5
Engineering
5.5
Engineering
5.5
Engineering
5.5
Engineering
5.5
Engineering
5.5
Engineering
5.5
Engineering
5.5
Engineering
5.5
Engineering
5.5
Engineering
5.5
Engineering
5.5
Engineering
5.5
Engineering
5.5
Engineering
5.5
Page 12 of 41
DL-NIRSP DRD
S63-50
Reliability and Lifetime
S63-51
Reliability and Lifetime
S63-52
Reliability and Lifetime
S63-53
Reliability and Lifetime
S63-54
Reliability and Lifetime
S63-55
Maintenance
S63-56
Maintenance
S63-57
Maintenance
S63-58
Maintenance
S63-59
Maintenance
S63-60
Maintenance
fluctuations
All items not designed
to exceed 50 years
(TBC)shall be
identified and
approved by AURA
Total non-scheduled
down time shall not
exceed two days per
year
MTBF>9,000 hours
(TBC)
Friction and wear
components shall be
easily replaced
Servicing instructions
shall include
inspections of friction
and wear components
to evaluate conditions
on a periodic basis
All systems shall be
configured such that
maintenance can be
carried out without
hazard
Weekly inspections
and simple
interventions shall
take less than 6 hours
per week
Six-monthly activities
shall take less than 24
hours total
All maintenance
procedures shall be
approved by AURA
All routine servicing
shall be specified and
provided with final
documentation
All routine
inspections, servicing
and general
maintenance shall be
accomplished by two
trained observatory
staff members with a
minimum of special
tooling
Engineering
5.5
Engineering
5.5
Engineering
5.5
Engineering
5.5
Engineering
5.5
Engineering
5.5
Engineering
5.5
Engineering
5.5
Engineering
5.5
Engineering
5.5
Engineering
5.5
Source (section)
Engineering
DRD
5.10
3.4 Spare Policy (SPEC-0041)
Reference
S41-1
Description
Spares
Requirement
Spare parts will be
provided
Goal
~10%
3.5 General Specifications for the Design and Fabrication of ATST (SPEC-0070)
Reference
S70-1
S70-2
Description
General
General
S70-3
General
DL-SPEC-0002, Revision A
Requirement
Part count to be minimized as much as possible
Performance and functionality to be obtained through
elegance of design
Preference for off-the-shelf components
Source (section)
Engineering
Engineering
DRD
5.9
5.9
Engineering
5.9
Page 13 of 41
DL-NIRSP DRD
S70-4
General
S70-5
General
S70-6
General
S70-7
General
S70-8
General
S70-9
S70-10
Drawings
Drawings
S70-11
Design analysis
S70-12
Drawings
S70-13
Maintenance
S70-14
Maintenance
S70-15
Fabrication
S70-16
Fabrication
S70-17
Fabrication
S70-18
Fabrication
S70-19
Fabrication
S70-20
Fabrication
S70-21
Fabrication
S70-22
Fabrication
S70-23
S70-24
Fabrication
Bolts and
Hardware
S70-25
Bolts and
Hardware
S70-26
Bolts and
Hardware
(Quality
Control?)
Bolts and
Hardware
Bolts and
Hardware
Bolts and
Hardware
Bolts and
Hardware
Bolts and
Hardware
S70-27
S70-28
S70-29
S70-30
S70-31
S70-32
S70-33
Surface Finish,
Coatings and
Paint
Surface Finish,
DL-SPEC-0002, Revision A
Design using efficient and effective manufacturing
processes
Modular design approach to aid in
mounting/disassembling servicing
Parts needing alignments mounted with adjustment
screws and locking mechanisms
Written instructions for assembly, disassembly,
servicing, and alignment
Alignment and calibration tools (incl. software) to be
provided to the customer
Shall conform to AMSE Y14.5M-1982
Shall be in SI units with Imperial units shown in
parentheses
Shall be performed in SI units with Imperial units
shown in parentheses
Shall be provided in the latest version of SolidWorks
(2D and 3D)
Routine servicing and general maintenance <8 hours
for two trained observatory staff members
All special tools and equipment required for set-up,
maintenance and servicing is required throughout the
design lifetime
All materials shall be new and of high grade
commercial quality
Engineering
5.9
Engineering
5.9
Engineering
5.9
Engineering
5.9
Engineering
5.9
Engineering
Engineering
5.9
5.9
Engineering
5.9
Engineering
5.9
Engineering
5.9
Engineering
5.9
Engineering
5.9
All materials shall be sound and free of defects (NonDestructive Inspection?)
Material certification required for all major structural
components
Workmanship shall be of high grade of commercial
practice and adequate to achieve the accuracies and
surface finishes called for on all drawings and in the
specifications
All manufacturing processes shall be specified and
followed
All metal edges shall be free of burrs and sharp
corners
Materials used shall be consistent with all
requirements, incl. life cycle ,reliability and
maintainability
Material substitution requires written approval from
AURA
Traceability of materials
All bots, nuts, screws and other fasteners shall
conform to appropriate ANSI or AISC standards,
unless otherwise specified by AURA
All bots, nuts, screws and other fasteners shall be
installed in an approved method, specified in the
standards
Close tolerance bolts and their washer faced nuts
shall be manufactured to approved dimensions
Engineering
5.9
Engineering
5.9
Engineering
5.9
Engineering
5.9
Engineering
5.9
Engineering
5.9
Engineering
5.9
Engineering
Engineering
5.9
5.9
Engineering
5.9
Engineering
5.9
Only new bolts, washers, nuts and other fastening
hardware shall be used
Procurement and installation of bolts per specification
Engineering
5.9
Engineering
5.9
Specification shall conform to an appropriate standard
Engineering
5.9
All bolts shall be properly lubricated at the time of
installation
Dimensions and washer requirements for oversize,
short slotted and long slotted holes, shall conform to
an appropriate high strength bolting specification
All exposed machined surfaces shall have a surface
finish of 64-microinches or better
Engineering
5.9
Engineering
5.9
Engineering
5.9
Surface finishes have to be approved by AURA
Engineering
5.9
Page 14 of 41
DL-NIRSP DRD
S70-34
S70-35
S70-36
S70-37
S70-38
S70-39
S70-40
S70-41
S70-42
S70-43
S70-44
Coatings and
Paint
Surface Finish,
Coatings and
Paint
Surface Finish,
Coatings and
Paint
Surface Finish,
Coatings and
Paint
Safety
Metrology,
Inspection
Metrology,
Inspection
Packing and
Shipping
Packing and
Shipping
Packing and
Shipping
Packing and
Shipping
Packing and
Shipping
S70-45
Packing and
Shipping
S70-46
Packing and
Shipping
Site Assembly
and Installation
Environmental
Conditions
S70-47
S70-48
S70-49
S70-50
S70-51
Environmental
Conditions
Environmental
Conditions
Environmental
Conditions
These finishes shall not adversely affect the
functioning of the telescope, nor require additional
maintenance during the life of the telescope
All protective coatings shall be of high quality and
long life
Engineering
5.9
Engineering
5.9
All metallic surfaces, other than mating machined
surfaces, shall be painted or otherwise permanently
protected against atmospheric corrosion
Shall conform to ATST SPEC-0086 and associated
documents (SPEC-0060, SPEC-0031, SPEC-0030,
SPEC-0035)
All equipment and standards shall be calibrated and
traceable to established standards
Final deliverable cables and hoses shall be used in all
acceptance testing
All materials and equipment for shipment shall protect
them to damage in transit and storage
Bearing surfaces and other exposed critical surfaces
shall be particularly protected to avoid damage
Electrical and electronic components shall be packed
with a dehumidifying agent
All parts shall be properly identified
Engineering
5.9
Engineering
5.9
Engineering
5.9
Engineering
5.9
Engineering
5.9
Engineering
5.9
Engineering
5.9
Engineering
5.9
All packaging, packing materials, slinging, and
handling equipment design shall be approved for use
by AURA
The instrument shall be disassembled into a minimum
number of parts and subassemblies after completion
of acceptance testing
Parts and subassemblies shall be packaged in
approved shipping containers
Components shall be designed for a straight-forward
handling and installation at the Site
The instrument shall be designed to function properly
under the environmental conditions defined in SPEC0070 (daytime hours)
The instrument shall be designed to survive the Site
Survival Conditions defined in SPEC-0070
All components shall be vented to prevent damage or
failure when going from sea level to the observatory
site
Any equipment and motors designed to operate at
normal atmospheric air pressures and incorporating
air cooling shall be de-rated
Engineering
5.9
Engineering
5.9
Engineering
5.9
Engineering
5.9
Engineering
5.9
Engineering
5.9
Engineering
5.9
Engineering
5.9
Note: all these specifications seem to apply to the telescope more than to the instrument. Confirm
requirements
3.6 Software and Controls Requirements (SPEC-0005)
Reference
Description
Requirement
S05/0600X
Documentation
Source code, revisions, and
operator documents
DL-SPEC-0002, Revision A
Source (section)
DRD
section
Error!
Reference
source
not
found.
Error!
Reference
source
not
found.
Page 15 of 41
DL-NIRSP DRD
S05/0700X
S05/0800X
Security
Safety
Unauthorized access is not allowed
Cannot interfere with safety
systems, interlock
S05/09006
Simulation
Control system must support
simulation
TBD
Error!
Reference
source
not
found.
TBD
S05/1
S05/1
S05/1
S05/1
S05/1
S05/1
3.7 Instrument Control System Specification Document (SPEC-0023)
Reference
Description
S23/3.1.40005
S23/3.1.40006
Instrument Management
S23/3.1.40010
Best Software Practices
S23/3.1.40015
S23/3.1.40025
Control
S23/3.1.40030
Logging
S23/3.1.40030
Availability
S23/3.1.40040
Persistence of Data
Requirement
DL-SPEC-0002, Revision A
DRD
section
TBD
Error!
Reference
source
not
found.
Error!
Reference
source
not
found.
Error!
Reference
source
not
found.
TBD
Standard Software
Components
Health
Source (section)
Determine and report health every 3
seconds
Static info required for operation
shall be recoverable
Error!
Reference
source
not
found.
Error!
Reference
source
not
found.
Error!
Reference
source
not
found.
Error!
Reference
source
not
found.
Page 16 of 41
DL-NIRSP DRD
Default State
S23/3.1.40060
Restart
S23/3.1.40100
S23/3.1.40110
S23/3.1.40120
S23/3.1.41000
Control of instruments in an
observation
Facility instruments and
science capabilities
Coordinated Observations
S23/3.1.41010
Command Response Time
S23/3.1.41020
Boot Time
Control system shall become
available within 5 min after boot
S23/3.1.41040
Computer Resources
Shall not consume more than 50%
CPU resources
S23/3.1.41210
Common Services
Framework
Control system will be built using
CSF
S23/3.1.41250
S23/3.1.41300
S23/3.1.41305
Traceability
Error!
Reference
source
not
found.
Error!
Reference
source
not
found.
Error!
Reference
source
not
found.
Error!
Reference
source
not
found.
Error!
Reference
source
not
found.
TBD
Engineering User Interface
TBD
Time Standard
TBD
Time to Accept or Reject
Command
DL-SPEC-0002, Revision A
Control system must have a default
state
Error!
Reference
source
not
found.
Error!
Reference
source
not
found.
TBD
S23/3.1.40050
TDB
TBD
Accept or reject commands in 0.1s
Page 17 of 41
DL-NIRSP DRD
4 DERIVED REQUIREMENTS & SPECIFICATIONS
Derived requirements flow down from the top-level requirements given in section 3, application of
requirements for safety, and common engineering practices and through the DL-NIRSP design given in the
DL-NIRSP Preliminary Design Document, SPEC-00xx.
4.1 Optical System
4.1.1
RMS Wavefront Error < 70 nm
To achieve diffraction-limited performance at 900 nm, the RMS wavefront error of the system cannot be
greater than 70 nm.
Verification: Test
Requirement Origin: DL-NIRSP ISRD-3
4.1.2
Location
The DL-NIRSP shall be located in the coudé station optically behind the Adaptive Optics System to take
advantage of its wavefront correction. It shall also be located behind the facility beamsplitter train that
feeds the other facility instrument; enabling it to be operated simultaneously with the Visible Broadband
Imager (VBI), the Visible Spectropolarimeter (ViSP), and the Visible Tunable Filter (VTF).
Verification: Design
Requirement Origin: DL-NIRSP ISRD-14
4.1.3
Feed Optics
4.1.3.1 All Reflecting Optics
DL-NIRSP will observe spectral lines spanning a broad wavelength range, from 900 nm to 2500 nm, with
a goal of 600 nm to 2500 nm. To achieve this broad wavelength coverage without compromise in image
quality and system efficiency, while maintaining a common focal plane for the entire wavelength range,
an all-reflecting optical design is required.
Verification: Design
Requirement Origin: DL-NIRSP ISRD-1, Engineering
4.1.3.2 Dual Resolution/FOV Feed Optics
DL-NIRSP will support science observations with diverse requirement for spatial resolution and field of
view coverage. However, it should be noted that the diffraction-limited spatial resolution (ISRD-3)
and the 2-arcmin field of view (ISRD-4) requirements cannot be met simultaneously with current
technology, nor is it necessary to achieve the science objectives of the instrument. Meeting these two
requirements simultaneously requires the use of 8,096 x 8,096 format camera, which is not considered
feasible by the Project. It also places extremely demanding, if not outright impossible requirements on the
optical design.
DL-SPEC-0002, Revision A
Page 18 of 41
DL-NIRSP DRD
A flexible feed optical system that allows for rapid switching between a high spatial resolution
configuration and a large field of view configuration will meet all the science objectives of the
instrument.
Verification: Test
Requirement Origin: DL-NIRSP ISRD-3, 4, Engineering
4.1.3.3 High-Resolution F/63 Mode
The F/# (and therefore the plate scale) of the feed optics is uniquely determined by three parameters,
namely: 1) the aperture of the telescope (4 m), 2) the spatial resolution requirement (diffraction-limited at
900 nm), and 3) the spatial sampling size of the instrument. The HAWAII-2RG-18 (H2RG-18) IR camera
is designated as the baseline camera for the DL-NIRSP, with an upgrade path to the HAWAII-4RG-15
(H4RG-15), currently under development. For spectroscopic performance considerations (See TBD), the
spectrograph will observe the solar features with a spatial sampling size equal to the size of two camera
pixels, or 36 (30) µm using the HAWAII-2RG-18 (HAWAII-4RG-15) camera. To achieve diffractionlimited resolution at 900 nm, the spatial sampling size should be equal to or less than ½ the Airy disk size
of the 4 m aperture of the ATST, or 0.0283”. A F/63 feed optics will yield a spatial sampling size of
0.029” for the H2RG-18 camera, equal to (1.04) the 2X critical sampling size.
Verification: Test
Requirement Origin: DL-NIRSP ISRD-3, Engineering
4.1.3.4 F/63 Feed Optics Resolution: Diffraction-Limited at 900 nm
DL-NIRSP will perform diffraction-limited observation using the F/63 feed optics system. The optical
performance needs to be equal to or better than diffraction-limited at 900 nm.
Verification: Test
Requirement Origin: DL-NIRSP ISRD-3 4, Engineering
4.1.3.5 Large-FOV F/24 Feed Mode
A F/24 feed optics will yield a field of view of 2 arcmin for the H4RG-15 camera. For the baseline
H2RG-18 camera, the field of view is 80”. DL-NIRSP will be equipped with a field scanning mirror
(DLF-OAM2) to perform 2 x 2 mosaic to obtain 160” x 160” (2.7’ x 2.7’) FOV. The field of view of the
instrument when H4RG-15 detector upgrade is implemented will be 120” x 120” (2’ x 2’) without
mosaic, meeting the 2’ x 2’ FOV requirement.
Verification: Test
Requirement Origin: DL-NIRSP ISRD-4, Engineering
4.1.3.6 F/24 Feed Optics Resolution: Diffraction-Limited at 2500 nm
In F/24 mode, the 36 µm slit samples a 0.08”-wide slice of the Sun. This is equivalent to the critical
sampling size of 0.16”, or the diffraction limit of the ATST at 2500 nm.
Verification: Test
Requirement Origin: DL-NIRSP ISRD-3 4, Engineering
DL-SPEC-0002, Revision A
Page 19 of 41
DL-NIRSP DRD
4.1.3.7 Flexible Feed Optics Focal Plane Location
DL-NIRSP will operate in either the conventional scanning long-slit spectrograph mode or the trueimaging fiber-optic IFU mode. The baseline fiber-optic IFU will be constructed with conventional
flexible fused-silica optical fiber. This construction allows for the input array of the IFU to be placed at a
convenient location different from the focal plane of the slit mask assembly of the spectrograph when
operating in the long slit mode. The feed optics shall have the capability to place the focal plane at either
the location of the IFU, or at the slit mask of the spectrograph without physically moving the
spectrograph.
Verification: Test
Requirement Origin: DL-NIRSP ISRD-6, engineering
4.1.4
Field Scanning Mirror
The requirements for the field-scanning mirror are summarized in the following table. Rationales and
derivations of the requirements are documented in the DL-NIRSP Preliminary Design Document.
Repeatability
Accuracy
Minimum Step size
Maximum range of motion
Rotation-to-Translation Crosstalk
Time to Next Position
Minimum speed
Run-out
REQUIREMENTS
0.3 rad (0.06”)
0.3 rad (0.06”)
3 rad (0.6”)
7.3 × 205 × 7 = 10,475 rad (0.6 deg)
< 50 m
< 100 ms
> 1.7 deg/s
< 0.3 rad (0.06”)
Verification: Test
Requirement Origin: DL-NIRSP ISRD-16, Preliminary Design
4.1.5
Context Imager
4.1.5.1 Context Imager: All-Reflective Optical Design
The context imager is required to observe over a broad wavelength range from 900 to 2500 nm.
Diffraction-limited resolution is required over one-half of the field of view of the spectrograph. To
achieve this broad wavelength coverage without compromise in image quality and system efficiency,
while maintaining a common focal plane for all the wavelengths to eliminate the need of a high-speed
focus mechanism, an all-reflecting optical design is required.
Verification: Test
Requirement Origin: DL-NIRSP ISRD-17, Engineering
DL-SPEC-0002, Revision A
Page 20 of 41
DL-NIRSP DRD
4.1.5.2 Context Imager High-Speed Filter Wheel Assembly: 5-position filter wheel.
For ground-based observation, differential atmospheric refraction results in small shift of images at
different wavelengths. For proper alignment of DL-NIRSP images, it requires at least pseudosimultaneous context images spanning over the design wavelength range of the instrument for each
Stokes observation to directly measure the image shifts at the observing wavelength. A 5-position filter
wheel will provide coverage at four wavelengths plus a dark field.
Verification: Test
Requirement Origin: DL-NIRSP ISRD-17
4.1.5.3 Context Imager Camera Wavelength Range: 500 nm to 2500 nm
Observations over the entire instrument wavelength range are required.
Verification: Test
Requirement Origin: DL-NIRSP ISRD-17
4.1.5.4 Context Imager Camera Pixel Format
Observations covering only a fraction of the instrument field of view will be sufficient for image
registration purpose. A camera with approximately ½ the pixel format of the instrument science camera
will be identified for use with the context imager.
Verification: Test
Requirement Origin: DL-NIRSP ISRD-17
4.1.6
Fiber-Optic Integral Field Unit
Two distinctive classes of science cases require true-imaging spectropolarimetric capability, namely 1)
study of small-scale surface magnetism with short dynamic time scale, and 2) coronal magnetometry
which requires very long integration time, even for low-spatial-resolution observation, to achieve the
polarization sensitivity required for the detection of the weak coronal magnetic field signals. However,
these two classes of observation have very different spatial sampling requirements. The fiber-optic IFU
for Phase I of the DL-NIRSP project will be optimized for low spatial and spectral resolution coronal
magnetometry observations.
4.1.6.1 Fiber-Optic IFU Spatial Sampling Resolution: 1”
The fiber-Optic IFU will sample the field with 1" resolution, optimized for low spatial resolution coronal
magnetometry observations.
Verification: Test
Requirement Origin: DL-NIRSP ISRD-6, Preliminary Design
4.1.6.2 Fiber-Optic IFU Field of View Coverage: 1 arcmin
The fiber-optic IFU will cover a field of 1' x 1', limited by the H2RG-18 camera, and the maximum
packing ratio of the fiber-optic array.
Verification: Test
Requirement Origin: DL-NIRSP ISRD-6, Preliminary Design
DL-SPEC-0002, Revision A
Page 21 of 41
DL-NIRSP DRD
4.1.6.3 Microlens Array Coupled Fiber-Optic IFU Input Array
A microlens array will be coupled to the input array of the fiber-optic IFU for high efficiency between the
telescope system and the fiber-optic IFU.
Verification: Test
Requirement Origin: DL-NIRSP ISRD-6, Preliminary Design
4.1.6.4 Multiple-Slit Fiber-Optic IFU Exit Array
The fiber-optic IFU for DL-NIRSP will be equipped with multiple parallel exit arrays to maximize the
utilization of available pixels of the camera systems.
Verification: Test
Requirement Origin: DL-NIRSP ISRD-6, Preliminary Design
4.1.7
Spectrograph
4.1.7.1 All-Reflective Optical Design
DL-NIRSP will simultaneously observe spectral lines spanning a broad wavelength range, from 900 nm
to 2500 nm, with a goal of 600 nm to 2500 nm. To achieve this broad wavelength coverage without
compromise in image quality and system efficiency, while maintaining a common entrance slit location
for the entire wavelength range, an all-reflecting optical design is required.
Verification: Test
Requirement Origin: DL-NIRSP ISRD-1, 10, Preliminary Design
4.1.7.2 Flexible Entrance Location
DL-NIRSP will operate in either the conventional scanning long-slit spectrograph mode or the trueimaging fiber-optic IFU mode. The fiber-optic IFU will be constructed with conventional flexible fusedsilica optical fiber. This construction allows for the exit array of the IFU to be placed at a convenient
location different from the entrance slit of the spectrograph when operating in the long slit mode. The
spectrograph optical system shall have the capability to accept light from the exit array of fiber-optic IFU,
or from the entrance slit of the spectrograph in the conventional scanning long-slit mode without
physically moving the spectrograph.
Verification: Test
Requirement Origin: DL-NIRSP ISRD-6, Preliminary Design
4.1.7.3 Multiple-Slit Capability
Multiple-slit capability will be provided by a set of slit masks constructed from etched slits on reflecting
surfaces coated on precision window substrates using photolithography processes. The number of slits
and separation between adjacent slits will be optimized for science goals and bandwidth of bandpass
isolation filters.
Verification: Test
Requirement Origin: DL-NIRSP ISRD-5
DL-SPEC-0002, Revision A
Page 22 of 41
DL-NIRSP DRD
4.1.7.4 4-Position Slit Mask Wheel
To accommodate the broad science goals of the DL-NIRSP, and to allow for spectral flatfielding utilizing
facility flatfield calibration lamps, multiple-slit masks with assorted slit widths are required. A motorized
4-position slit mask wheel will allow quick change of the slit masks.
The slit width for science observation will at least 2X oversamples the diffraction spot size of the ATST
at 900 nm.
Verification: Test
Requirement Origin: DL-NIRSP ISRD-5, Preliminary Design
4.1.7.5 3-Position Grating Turret
In order to meet the large spectral resolution requirements (from R ~ 50,000 to 200,000), the spectrograph
will be equipped with a 3-slot grating turret to accommodate gratings with different blaze angle.
Verification: Test
Requirement Origin: DL-NIRSP ISRD-2, Preliminary Design
4.1.7.6 Spectrograph: Dichroic Beam Splitter System
A beam-splitting system consisting of a series of three dichroic beam splitters, and a final fold mirror, will
split the exit beam of the spectrograph into four wavelength bands.
Verification: Test
Requirement Origin: DL-NIRSP ISRD-1, 10, Preliminary Design
4.1.7.7 Spectrograph: Relay Optics System
Four relay optical systems will relay the four exit beams provided by the beam-splitter system to four
final focal planes. The relay optics will have identical prescriptions except for anti-reflection coating
optimized for each wavelength band.
Verification: Test
Requirement Origin: DL-NIRSP ISRD-1, 10, Preliminary Design
4.1.8
Polarimeters
4.1.8.1 High-Speed Wavelength-Specific Polarization Modulation Units
DL-NIRSP will be equipped with four high-speed SWIFT Liquid Crystal Variable Retarder (LCVR)based Polarization modulators in the four relay arms, each optimized for the wavelength range of the
relay arm, for observation in the multiple long-slit mode.
Verification: Test
Requirement Origin: DL-NIRSP ISRD-7, Engineering
DL-SPEC-0002, Revision A
Page 23 of 41
DL-NIRSP DRD
4.1.8.2 Broadband Polarization Modulation Unit
The baseline fiber optics IFU will be constructed with conventional, non-polarization-maintenance multimode fibers. Polarization analysis will needs to be performed upstream of the fibers. DL-NIRSP will be
capable of utilizing the facility broadband polarization modulator located at the Gregorian Optical Station
(GOS) of the telescope for observation in the fiber optics IFU mode.
Verification: Test
Requirement Origin: DL-NIRSP ISRD-7, Engineering
4.1.8.3 Polarization Calibration Optics
DL-NIRSP shall be able to utilize the facility GOS polarization calibration optics to perform instrumental
polarization crosstalk calibration.
Verification: Test
Requirement Origin: DL-NIRSP ISRD-7, Engineering
4.1.8.4 Polarization Accuracy
DL-NIRSP shall utilize the cross correlation telescope polarization calibration method to calibrate and
correct for the end-to-end polarization crosstalk of the instrument. This is the baseline polarization
crosstalk calibration method for the ATST, currently under development with close collaboration between
the DL-NIRSP instrument team and the ATST instrument scientist, and expected to achieve 5 x 10 -4
polarization accuracy.
Verification: Test
Requirement Origin: DL-NIRSP ISRD-7, Engineering
4.1.8.5 Simultaneous observation of two orthogonal polarization states
DL-NIRSP will be equipped with four Wollaston polarizing beam splitter in the four relay arms for dual
beam polarimetry when operating in the multiple long-slit mode.
Additionally, a Wollaston polarizing beam splitter will be located in front of the input array of the fiberoptic IFU for observation in the true-imaging mode.
Verification: Test
Requirement Origin: DL-NIRSP ISRD-9, Engineering
DL-SPEC-0002, Revision A
Page 24 of 41
DL-NIRSP DRD
4.1.8.6 Cameras
4.1.8.6.1 Camera 1 & 2
Camera 1
Wavelength Range
Format
Pixel Size
% Pixel Operability
Frame Rate
Quantum Efficiency
Full-Well Capacity
Read Noise
400 nm - 1,000 nm
2048 x 2048
0.018 mm
> 95 %
78 FPS
> 60%
> 100,000 e30 e-
Verification: Test
Requirement Origin: DL-NIRSP ISRD-1, 2, 3, 4, 5, 6, 10
4.1.8.6.2 Camera 3 & 4
Camera 2
Wavelength Range
Format
Pixel Size
% Pixel Operability
Frame Rate
Quantum Efficiency
Full-Well Capacity
Read Noise
400 nm - 2,500 nm
2048 x 2048
0.018 mm
> 95 %
78 FPS
> 60%
> 100,000 e30 e-
Verification: Test
Requirement Origin: DL-NIRSP ISRD-1, 2, 3, 4, 5, 6, 10
4.2 Control System
4.2.1
General Requirements
4.2.1.1 Control Software Standards
The DL-NIRSP CS shall conform to the software standards for ATST control systems. These standards
are defined by the ATST Software Requirements (SPEC-0005), Software Operational Concepts (SPEC0013, and the Software Design (SPEC-0014). This requires that the DL-NIRSP CS shall use the ATST
Common Services software framework (SPEC-0022).
DL-SPEC-0002, Revision A
Page 25 of 41
DL-NIRSP DRD
The ATST Common Services framework specifies that software control systems use the ATST controller
model, where the control system is comprised of a hierarchical set of controller components. These
components use the ATST services (such as events, logging, and properties) to communicate with each
other and with other parts of the ATST software system.
Any deviation from the use of the framework should be justified, reviewed by the ATST software team,
and well documented.
Verification: Design Review, Test
Source: Engineering (SPEC-0023)
4.2.1.2 Common Services Framework
The DL-NIRSP CS shall use the ATST Common Services Framework for all communications on the
Control LAN.
Verification: Design Review
4.2.1.3 Instrument Controller (IC)
The DL-NIRSP CS shall perform as the instrument controller for the DL-NIRSP. As an instrument
controller, the DL-NIRSP CS shall follow all commands delivered from the ICS to control the DL-NIRSP
and communicate required status information back to the ICS.
The DL-NIRSP shall be constructed using the ICS framework as much as possible. This may include, but
is not limited to, framework components such as the Instrument Sequencer, Motion Controller, Detector
Controller, and Hardware Controller.
Verification: Design Review
Source: Engineering (SPEC-0023)
4.2.1.4 Control System
The systems within the DL-NIRSP shall be controlled and monitored by the DL-NIRSP Control System.
It shall be responsible for coordinating the activities that use the mechanical and detector subsystems. It
shall directly control these subsystems, read their status, and provide direction as required.
Verification: Design Review
Source: Engineering (SPEC-0023)
4.2.1.5 Containers and Components
The DL-NIRSP CS shall use container and components as described by the Software Concepts Definition
(SPEC-0013) and defined in the CSF Users’ Manual (SPEC-0022-1).
Verification: Design Review
Source: Engineering (SPEC-0013)
4.2.1.6 Configuration Identifiers
The DL-NIRSP CS shall use the proper configuration identifier in all communications. A configuration
identifier is supplied to the DL-NIRSP CS for each and every configuration sent to it from the ICS. The
DL-NIRSP CS shall use configuration identifiers to track actions throughout the DL-NIRSP CS.
Verification: Design Review
Source: Engineering (SPEC-0013)
DL-SPEC-0002, Revision A
Page 26 of 41
DL-NIRSP DRD
4.2.1.7 Time Standard
The DL-NIRSP CS shall use UTC for reporting time in displays, logging, headers, status, events, and
alarms.
Verification: Design Review, Test
Source: Engineering (SPEC-0013).
4.2.2
Function Requirements
4.2.2.1 Logging
The DL-NIRSP CS shall log pertinent data to the ATST facility log mechanism. Pertinent data shall
include, but not be limited to, state changes, configuration changes, errors, alarms and warnings, and any
other information that may assist in reconstructing the operation of the DL-NIRSP CS. The DL-NIRSP
CS logging level shall be user selectable for the depth of information.
Verification: Design Review, Test
Source: Engineering (SPEC-0023)
4.2.2.2 Default State
The DL-NIRSP CS shall have a defined default state for all operations and control loops that it controls,
including but not limited to: positioning of mechanical components, thermal control, and detector state.
The default state of DL-NIRSP CS shall be that all mechanisms are in an inert, non-moving, but powered
condition. The DL-NIRSP CS shall assume this default state after startup.
Verification: Design Review, Test
Source: Engineering (SPEC-0023)
4.2.2.3 Restart
The DL-NIRSP CS shall perform all action requests sent through its public interface without need of
reboot or re-initialization, unless the request demands such an operation.
Verification: Design Review, Test
Source: Engineering (SPEC-0023)
4.2.2.4 Health
The DL-NIRSP CS shall be capable of determining its health and report that health through the Common
Services Framework health mechanism. The DL-NIRSP CS shall be able to determine if it is performing
within its operational specifications, and return a result of good, ill, or bad for DL-NIRSP CS health states
that are operational, performing below specification, and not performing at all, respectively. The DLNIRSP CS health report shall include information on the particular DL-NIRSP CS systems that are
performing below specification and the possible reason for the poor health. The DL-NIRSP CS shall
determine and report the health at least every 3 seconds.
Verification: Design Review, Test
Source: Engineering (SPEC-0023)
4.2.2.5 Availability
The DL-NIRSP CS shall always be available to accept or reject commands. It shall not block any
command request while processing another command request.
This requirement prevents the DL-NIRSP CS from processing a command in one thread, essentially
blocking subsequent commands until the first one is completed. This behavior is necessary to perform
DL-SPEC-0002, Revision A
Page 27 of 41
DL-NIRSP DRD
commands such as stop and pause after an initial start command; otherwise it would be difficult to stop an
ongoing operation.
Verification: Design Review, Test
Source: Engineering (SPEC-0023)
4.2.2.6 Persistence of Data
Static information required by the DL-NIRSP CS to operate shall be recoverable after a restart or reboot.
This information may include, but is not limited to, default mechanical positions, named mechanical
positions, and configuration parameters.
Verification: Design Review, Test
Source: Engineering (SPEC-0023)
4.2.2.7 Command/Action/Response directives
The DL-NIRSP CS shall obey the ATST Common Services Framework command interface when issuing
all commands to the DL-NIRSP CS subsystems.
Verification: Design Review
Source: Engineering (SPEC-0013)
4.2.2.8 Events
The DL-NIRSP CS shall use the ATST Common Services event interface to send and receive
asynchronous information between itself and the subsystems.
Verification: Design Review
Source: Engineering (SPEC-0013)
4.2.2.9 Sequencing
The DL-NIRSP CS shall be responsible for maintaining any sequence or order of command execution for
commands sent by the ICS. Commands from the ICS shall be executed in the order they are received or, if
given with associated start times, in the order of the start times. All valid commands shall be queued by
the DL-NIRSP CS for execution.
Verification: Design Review, Test
Source: Engineering (SPEC-0013)
4.2.2.10
Alarms
The DL-NIRSP CS shall generate alarms for any errors or problems it detects that require operator
notification or intervention. Alarms shall be generated for loss of control or contact with its subsystems or
any mechanism end-of-travel.
Verification: Design Review, Test
Source: Engineering (SPEC-0013).
4.2.3
System Actions
4.2.3.1 Start
The DL-NIRSP CS shall allow users of its public interface to command it to start performing the
activities necessary to meet the specified configuration (i.e. mode and parameters).
Verification: Design Review, Test
Source: …
DL-SPEC-0002, Revision A
Page 28 of 41
DL-NIRSP DRD
4.2.3.2 Pause
The DL-NIRSP CS shall allow users of its public interface to command it to pause the current action
being performed.
Idle – stays idle
Motion – after motion is finished
Data Collection – at end of frame set
Engineering image computation / Property Update – pause before next image computation OR after
property update is complete
Verification: Design Review, Test
Source: Engineering (OCD)
4.2.3.3 Resume
The DL-NIRSP CS shall allow users of its public interface to command it to resume an action that had
been paused.
Idle – Remain idle
Motion – Continue with next script action
Data Collection – Continue with next script action
Engineering Image Computation – Continue with next script action
Verification: Design Review, Test
Source: Engineering (OCD)
4.2.3.4 Cancel
The DL-NIRSP CS shall allow users of its public interface to command it to cancel the current action
being performed.
Idle – Remain idle
Motion – Finish current motion then terminate script
Data Collection – Finish current frame set then terminate script
Engineering image computation / Properties Update – Terminate script before next engineering image
request OR after properties update
Verification: Design Review, Test
Source: Engineering (OCD)
4.2.3.5 Abort
The DL-NIRSP CS shall allow users of its public interface to command it to abort the current action
being performed.
Idle – Remain idle
Motion – Terminate current motion and exit script
Data Collection – Terminate current data collection and exit script
Engineering image computation / Properties Update – Terminate current computation or properties update
Verification: Design Review, Test
Source: Engineering (OCD)
DL-SPEC-0002, Revision A
Page 29 of 41
DL-NIRSP DRD
4.2.4
System Setting Requirements
4.2.4.1 Instrument parameters
This section contains all requirements for the DL-NIRSP instrument settings.
Setting
Resolution
Light source
Slit mask
Polarimeter
Scan mode
Scan step size
Number of scans
Number of scan
steps
Time interval
between 2 steps
Values /
units
Low, High
IFU, beam
1,2,3,4
On, Off
Continuous,
dither
Default
ISRD #5
auto
1 to max
allowable
steps
Integer or
‘free run
mode’
auto
auto
(aka loops, maps, cycles)
Tick marks for synchronization
- Information is needed for timeout,
observations and synchronization
purposes
- ‘free run mode’ = as fast as possible
Wavelengths
Number of
measurements
Exposure time
Source
requirement
Additional explanation
Milliseconds
Co-add
Camera spectral
binning
Camera spatial
binning
CI Camera spatial
binning
Instr. Polarimeter
tuning parameters
Facility Polarimeter
initial position
Facility Polarimeter
increment step
Number of exposures of one specific type
of observation added together (i.e. one
state of the modulator) to produce one
single image (i.e. contains X frames to ‘coadd’).
Binning in (X) direction
Arm/
CI
Arm/
CI
Arm/
CI
Arm/
CI
Arm
Binning in (Y) direction
Arm
Binning in (X,Y) direction
CI
Arm
Arm
Arm
Table 1 - Instrument parameters.
Verification: Design Review, Test
4.2.5
DL-NIRSP specific to telescope interaction requirements
4.2.5.1 Exposure Synchronization with the Polarimeter
The polarimeter will be implemented within the DL-NIRSP instrument. Moreover, the DL-NIRSP
instrument will also use the telescope polarimeter and therefore synchronization shall be defined in a
future ICD.
4.2.5.2 Synchronization with the Occulting mechanism at M2
TBD
DL-SPEC-0002, Revision A
Page 30 of 41
DL-NIRSP DRD
4.2.6
System Modes Requirements
Remark: The following paragraphs should be moved in the DL-NIRSP OCD.
DL-NIRSP operations require N operational modes:








“Morning Setup”: to be executed as turn-on procedure. It includes a special focus procedure to check if the
telescope image is focused on the slit jaw. It requires a pre-defined setup of the context imager and its camera.
Focus: to be executed as part of the setup mode each time a new wavelength is selected
Setup: to be executed before each new observing program
Observe: to start an observing program
Dark: dark calibration
Gain: flat field calibrations
PolCal: polarimeter calibration. This mode can be executed with the facility polarimeter or the instrument
polarimeter.
Target: to be used for plate scale calibration and registration
Any DL-NIRSP observing sequence shall be made of the following operational modes: Setup (inc. focus),
Calibration, Observe.
The calibration sequence shall be the following: Dark, Gain (solar and lamp), Instrument PolCal
There is no distinction of where the light comes from. Hence, the same procedures apply for IFU and light
beam.
Night time calibrations may not needed.
No absolute Photometry is required for DL-NIRSP.
4.2.6.1 System Configuration
DL-NIRSP is a multi-wavelength spectropolarimeter that can observe up to four spectral lines
simultaneously. For any given spectral line combination, a unique 'configuration file' containing all
necessary information of the spectropolarimeter will be generated using Zemax optical modeling
software.
4.2.6.2 Setup
The DL-NIRSP shall allow users of its instrument GUI plug-in to setup the DL-NIRSP before starting
any exposures. Any new observing program that requires a change of the current configuration of the
instrument shall be preceded by a setup sequence followed by a calibration sequence. These setting shall
remain in place until modified via another setup or by the engineering GUI plug-in. From this mode, the
user shall also be able to test the configuration.
The context imager shall have a fixed predefined sequence of observation that corresponds to four
wavelengths for each spectrograph position.
The following sequence describes the setup procedure and all associated opto-mechanical motions:

Set the light source:
o IFU:
o move FM1 and FM6 out of the beam path
o
Beam:
o

move FM1 and FM6 in the beam path
Set the resolution mode:
o Low resolution:
o insert FM5 and FM4 into the beam path
DL-SPEC-0002, Revision A
Page 31 of 41
DL-NIRSP DRD
o

High resolution:
o move away FM5 and FM4
Set spectral resolution
o Chose a slit mask
o Select spectral lines combination
o Move filter spectrograph filter wheel
o
o
Compute grating angle (done by Instrument Scientist using Instrument Configurator)
o
Move the grating
o
Compute beam splitter angles (for each arm, by Instrument Scientist using Instrument
Configurator)
o
Move beam splitters (for each arm)
o
Adjust the camera focus with RCoN stages (for each arms)
Start test exposures
4.2.6.3 Focus
The DL-NIRSP shall allow users of its instrument GUI plug-in to focus the DL-NIRSP. This mode can be
executed independently but shall be included in the Setup mode (because the focus is wavelength
dependant).
This is a spectrograph mode only; there is no focus mode for the context imager.
The following sequence describes the focus procedure and all associated opto-mechanical motions:

Check spectral and spatial focus within the instrument:
o Move (manually) RCoN stage for each arm until focus position is achieved
4.2.6.4 Observe
The DL-NIRSP shall allow users of its instrument GUI plug-in to command the DL-NIRSP and perform
observation activities using parameters setup in the Setup mode.
The only moving mechanisms during any observing sequences shall be the scanning mirror stage and the
context imager filter wheel.
4.2.6.5 Dark
The DL-NIRSP shall allow users of its instrument GUI plug-in to perform dark flatfield activities. In this
mode, a burst of exposures shall be collected. This mode will be used for both spectrograph and context
imager sides. It requires a dark slit at the GOS or an external shutter.
4.2.6.6 Gain
The DL-NIRSP shall allow users of its instrument GUI plug-in to perform flat field activities. In this
mode, a burst of exposures shall be collected by both spectrograph and context imager sides. The
scanning mirror is not involved in this position.
4.2.6.6.1
Solar flat field
To perform this operation, the telescope shall be out of focus, and the AO system in an unflatten mode.
The telescope shall be doing random pointing and does not require any synchronization with the DLNIRSP.
DL-SPEC-0002, Revision A
Page 32 of 41
DL-NIRSP DRD
4.2.6.6.2
Lamp flat field
The mode shall require the activation of a lamp at the GOS.
4.2.6.6.3
Sky flat field
The telescope shall be pointing the sky within its off-pointing capability.
4.2.6.7 Instrument PolCal
The DL-NIRSP shall allow users of its instrument GUI plug-in to perform the instrumental polarization
calibration using a calibration linear polarizer and 1/4-wave retarder located either within each
spectrograph arm or at the GOS.
The GOS calibration shall be performed as frequently as possible. The frequency shall be determined by
the telescope scientist or the PI. The Instrument calibration frequency is TBD.
The following settings are required. The default settings represent 1 set of observation of 36
measurements of 10º apart. The same procedure applies for both types of polarization calibration.
Calibration Optics 1 is the linear polarizer.
Calibration Optics 2 is the ¼-wave retarder.


Linear Polarizer
 Calibration Optics 1: move into the beam path
 Calibration Optics 2: should be out of the beam path
 Initial position (default 0º).
 Increment per step (default 10º).
 Number of Measurements (default 36)
 Number of scan steps (default to 0 = no scanning).
At the end of the sequence the following sequence shall be executed:
 Calibration Optics 1: move out of the beam path
1/4-wave retarder:
 Calibration Optics 1: move into the beam path
 Calibration Optics 2: move into the beam path
 Initial position (default 0º).
 Increment per step (default 10º).
 Number of Number of scan steps (default to 0 = no scanning).
 Number of scan steps (default to 0 = no scanning).
At the end of the sequence the following sequence shall be executed:
 Calibration Optics 1: move out of the beam path
 Calibration Optics 2: move out of the beam path
4.2.6.8 Target
The DL-NIRSP shall allow users of its instrument GUI plug-in to perform target observational activities.
In this mode, the DL-NIRSP will act the same way than the Observe mode. Metadata information shall
take into account this specific selected target.
There will be different targets (e.g., Air Force resolution target, Line grid, dot grid) available. It is
assumed that the target selection will be done at higher level. For this mode, DL-NIRSP shall only
provide the capability to scan the target. The target depends on the instrument resolution mode. This
mode shall be used for plate scale calibration and registration.
The scanning mirror may be used during this mode.
DL-SPEC-0002, Revision A
Page 33 of 41
DL-NIRSP DRD
4.2.6.9 System Modes Requirements settings
The following table summarizes the settings required for each observing mode.
Table 2 - System modes settings.
Setting
Spectrograph
Resolution
Light source
Slit mask
Polarimeter
Scan mode
Scan step size
Number of scans (aka
loops, maps, cycles)
Number of scan steps
Time interval between 2
steps
Wavelengths
Number of measurements
All arms
Exposure time
Co-add
Camera spectral binning
Camera spatial binning
Context imager
Wavelengths
Exposure time
Co-add
Camera spectral binning
Camera spatial binning
Polarimetry
Linear Polarimetry
Initial position
Increment
Retarder
Initial position
Increment
Tuning parameter
Setup
Gain
Dark
Polarimetry
Target
X
X
X
X
X
X
X
X
X
?
X
X
?
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
Predefined
Predefined
Predefined
Predefined
Predefined
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
Verification: Design Review, Test
Source: DL-NIRSP OCD, OCD (SPEC-0036)
4.2.7
Mechanism Control Requirements
4.2.7.1 Position and monitor filter and slit wheels (Spectrograph and Context Imager)
The DL-NIRSP CS shall control the position of filter and slit wheels used to position optical elements
within the DL-NIRSP. The DL-NIRSP CS shall operate the filter and slit wheels within the required
performance specifications of those components. The DL-NIRSP CS shall monitor the position of the
filter and slit wheels within the specified tolerance. It shall report those positional values in a timely
manner through its event system. It shall monitor and report all aspects of DL-NIRSP positioning
operation, including, but not limited to, limit switches, power, and drive voltages and currents. It shall
report and log errors and faults when operational performance is not achieved.
Verification: Design Review, Test
Source: Engineering, Operational Requirement (OCD)
DL-SPEC-0002, Revision A
Page 34 of 41
DL-NIRSP DRD
4.2.7.2 Position and monitor focus mirror stages (for each arm)
The DL-NIRSP CS shall control the position of the focus stages used to position the focusing mirror
within the DL-NIRSP. The DL-NIRSP CS shall operate the focus stages within the required performance
specifications of those components. The DL-NIRSP CS shall monitor the position of the focus stages
within the specified tolerance. It shall report those positional values in a timely manner through its event
system. It shall monitor and report all aspects of DL-NIRSP positioning operation, including, but not
limited to, limit switches, power, and drive voltages and currents. It shall report and log errors and faults
when operational performance is not achieved.
Verification: Design Review, Test
Source: Engineering, Operational Requirement (OCD)
4.2.7.3 Position and monitor resolution mode and light source mirror stages
The DL-NIRSP CS shall control the position of the resolution and light source mirror stages used to
position their mirrors within the DL-NIRSP. The DL-NIRSP CS shall operate these mirror stages within
the required performance specifications of this component. The DL-NIRSP CS shall monitor the position
of these mirror stages within the specified tolerance. It shall report those positional values in a timely
manner through its event system. It shall monitor and report all aspects of DL-NIRSP positioning
operation, including, but not limited to, limit switches, power, and drive voltages and currents. It shall
report and log errors and faults when operational performance is not achieved.
Verification: Design Review, Test
Source: Engineering, Operational Requirement (OCD)
4.2.7.4 Position and monitor grating turret stage
The DL-NIRSP CS shall control the position of the grating turret stage used to position the grating turret
within the DL-NIRSP. The DL-NIRSP CS shall operate the grating turret stage within the required
performance specifications of this component. The DL-NIRSP CS shall monitor the position of the
grating turret stage within the specified tolerance. It shall report those positional values in a timely
manner through its event system. It shall monitor and report all aspects of DL-NIRSP positioning
operation, including, but not limited to, limit switches, power, and drive voltages and currents. It shall
report and log errors and faults when operational performance is not achieved.
Verification: Design Review, Test
Source: Engineering, Operational Requirement (OCD)
4.2.7.5 Position and monitor scanning mirror stage
The DL-NIRSP CS shall control the position of the scanning mirror stage used to position the scanning
mirror within the DL-NIRSP. The DL-NIRSP CS shall operate the scanning mirror stage within the
required performance specifications of this component. The DL-NIRSP CS shall monitor the position of
the scanning mirror stage within the specified tolerance. It shall report those positional values in a timely
manner through its event system. It shall monitor and report all aspects of DL-NIRSP positioning
operation, including, but not limited to, limit switches, power, and drive voltages and currents. It shall
report and log errors and faults when operational performance is not achieved.
Verification: Design Review, Test
Source: Engineering, Operational Requirement (OCD)
DL-SPEC-0002, Revision A
Page 35 of 41
DL-NIRSP DRD
4.2.8
Interface Requirements
4.2.8.1 Instrument Control System
The DL-NIRSP CS shall provide an interface to the Instrument Control System (ICS) as defined by ICD3.1.4/3.4.1. This interface shall allow the ICS to issue commands specifying attributes and actions the
DL-NIRSP CS is to perform.
Verification: Design Review, Test
Source: Engineering, Operational Requirement (OCD)
4.2.8.2 Instrument Setup Tab
The DL-NIRSP shall have instrument setup tabs to be used in the OCS GUI that allows the setting of
parameters for each mode of the DL-NIRSP. The setup tabs will be based upon the ATST Common
Software Framework JES tool. The setup tabs shall be operable from computers other than the DL-NIRSP
CS on the ATST control network. The setup tab will allow the user to save and load parameter sets from
persistent storage.
Verification: Design Review, Test
Source: Engineering, Operational Requirement (OCD)
4.2.8.3 Engineering User Interface
The DL-NIRSP shall have an engineering user interface that implements all functional operations of the
DL-NIRSP CS and will be based upon the ATST Common Software Framework JES tool. The
engineering user interface shall be operable from computers other than the DL-NIRSP CS on the ATST
control network. The engineering user interface shall use the interfaces defined by the ICS interface
control document to perform all requested functionality.
Verification: Design Review, Test
Source: Engineering, Operational Requirement (OCD)
4.2.8.4 Simulation Control
The DL-NIRSP CS shall support simulating functionality of its mechanical and hardware subcomponents.
Verification: Design Review, Test
Source: Engineering (SPEC-0005), DL-NIRSP OCD
4.2.9
System Performance Requirements
4.2.9.1 Computer Resources
The DL-NIRSP CS shall consume no more than 50% of the host computer processing capability. The DLNIRSP CS shall not consume more than 50% of its allocated hard disk capacity.
Verification: Test
Source: Engineering (SPEC-0023)
4.2.9.2 Accept or Reject Commands
The DL-NIRSP CS shall accept or reject a command given on its public interface within 0.1 seconds.
Verification: Test
Source: Engineering (SPEC-0023)
DL-SPEC-0002, Revision A
Page 36 of 41
DL-NIRSP DRD
4.2.9.3 Command Response Time
The ICS shall execute an accepted command accepted on its public interface, transfer that command
through the OMS, ICs, and Mechanism Controllers and, in the case of a null action, report the command's
execution status back to the public interface within 0.1seconds.
Verification: Test
Source: Engineering (SPEC-00023)
4.2.9.4 Boot Time
The DL-NIRSP CS shall be operational and ready to receive and act upon commands within 5 minutes of
a cold, power-off start of its host computer hardware.
Verification: Test
Source: Engineering (SPEC-0023)
4.2.9.5 Computational Performance
The DL-NIRSP CS shall complete computational routines efficiently as specified below:
Focus – TBC
Target – TBD
Note: The performance requirements above only apply to the computations being performed by the DLNIRSP CS on delivered images.
Verification: Design Review, Test
Source: Operations (SPEC-0036, DL-NIRSP OCD)
4.2.10 Maintainability Requirements
4.2.10.1
Source Code
The DL-NIRSP CS shall provide all source code written for the DL-NIRSP CS. Third party libraries or
packages selected and used by the DL-NIRSP CS shall also be provided with source code. Any
exemptions from this requirement shall be requested by the DL-NIRSP to the ATST project before
proprietary source code is utilized by the DL-NIRSP CS.
Verification: Design Review, Test
Source: SPEC-0005
4.2.10.2
Source Documentation
The DL-NIRSP CS shall document all source code in a manner consistent with good software practices.
Specifically:

A consistent syntactical style shall be used.

Source files shall have a header containing version number, revisions, author(s), and
functional description.

Source functions or methods shall have a description of the interface and operation of the
function.

Major algorithms or operational sections of code shall be clearly commented.
Verification: Design Review, Test
Source: SPEC-0005
DL-SPEC-0002, Revision A
Page 37 of 41
DL-NIRSP DRD
4.2.10.3
Revision Repository
The DL-NIRSP CS shall use a revision repository (such as CVS) during construction. The repository
shall be accessible by the ATST during construction.
Verification: Design Review, Test
Source: SPEC-0005
4.2.11 Documentation Requirements
4.2.11.1
Final Design
The DL-NIRSP CS shall provide a final design document. This document shall include all details
necessary to construct the DL-NIRSP CS. During construction, this document shall be updated to show
any design modifications made during construction.
Verification: Design Review
Source: Engineering (SPEC-0005)
4.2.11.2
Public Interfaces
The DL-NIRSP CS shall document all public software interfaces. Public software interfaces are used by
the ICS, engineering interface, and the DL-NIRSP CS subsystems.
Verification: Design Review, Inspection
Source: Engineering (SPEC-0005)
4.2.11.3
Operator's Manual
The DL-NIRSP CS shall provide an operator’s manual that describes the use of the DL-NIRSP CS by an
ATST operator. The manual shall describe operation during normal observations, setup, troubleshooting,
and engineering.
Verification: Design Review, Inspection
Source: Engineering (SPEC-0005)
4.3
Data Handling Requirements
4.3.1
Usage of ATST Data Handling System
The DL-NIRSP shall use the ATST Data Handling System (DHS) to transport, process and store its
acquired scientific data.
Verification: Test
Source: Operations (OCD)
DL-SPEC-0002, Revision A
Page 38 of 41
DL-NIRSP DRD
4.3.2
Data Volume
4.3.2.1 Maximum size data products
Table 3- Estimated volume of data for the maximum speed avalaible
Rows
Columns
Rate (Hz)
Bytes/Pixel
2
Single Frame
Size (MB)
8
Bandwidth
(MB/s)
608
2048
2048
76
1024
1024
5
2
2
10
Comment
No accumulated
Spectrograph Camera
- Context Imager Camera
- Depending on camera
- Depending on speed
synchronization with
spectrograph
Verification: Review
Source: Operations
4.3.2.2 Other size data products
Table 4 - Estimated volume of data for a normal observing cadence
Rows
Columns
Rate (Hz)
Bytes/Pixel
4
Single Frame
Size (MB)
16
Bandwidth
(MB/s)
64
2048
2048
1
1024
1024
5
2
2
10
Comment
Accumulated
Spectrograph Camera
Context Imager Camera
Verification: Review
Source: Operations (CN-SPEC-0001/OCD)
4.3.3
Detailed Display Plug-In
The DL-NIRSP shall provide a Detailed Display plug-in extending the capabilities of the quick-look
display with the following capabilities:
-
Full stokes spectra and/or un-demodulated raw data of each scan position as it has been acquired
Full set context imager images for each scan position
A zoom function for images and spectra
Verification: Review
Source: Operations
4.3.4
Data Processing Plug-Ins
4.3.4.1 Dark Calibration Plug-In
Automated procedures will provide detector and telescope “dark” calibrations.
Verification: Review
Source: Operations
4.3.4.2 Gain Calibration Plug-In
Interactive procedures will be used to generate spectral and spatial gain variation information for the DL-NIRSP
optical path and detector. Automatic procedures will perform gain calibration on the data.
Verification: Review
Source: Operations
DL-SPEC-0002, Revision A
Page 39 of 41
DL-NIRSP DRD
4.3.4.3 Instrument Polarization Calibration Plug-In
Interactive end-to-end instrument polarization calibration procedures will be provided for derivation of
instantaneous telescope polarization crosstalk calibration using observation of strong magnetic features. Telescope
polarization crosstalk calibration can also be derived with ATST Project provided telescope polarization model.
Automatic procedure will perform polarization crosstalk correction on the data.
Verification: Review
Source: Operations
4.3.5
Metadata
For each saved frame, the following metadata are required to be provided with the data for data
processing, calibration, and reduction purposes.







Full telescope pointing
Time board information
Polarimetry
Polarization scheme
Modularization state
DL-NIRSP Instrument configuration
Camera configuration
Verification: Review
Source: Operations
4.4 Camera System
Under discussion with the Project. TBD
DL-SPEC-0002, Revision A
Page 40 of 41
DL-NIRSP DRD
5 GENERAL REQUIREMENTS
5.1 Reliability
The lifetime of the ATST telescope is expected to be in excess of forty years. The remote nature of the
site puts a premium on having robust systems that are easily repaired. Wherever possible, all DL-NIRSP
assemblies, subassemblies, components, parts, and mechanical systems shall be designed to exceed the
lifetime of the facility. Contractor shall identify any and all items not designed to exceed this lifetime, and
maintenance procedures and spares lists shall be provided for them.
Verification: Design Review & Analysis
Requirement Origin: Engineering (SPEC-0041)
5.2 Maintainability
The DL-NIRSP design shall ensure that all necessary maintenance operations can be effectively carried
out without risk to personnel or hardware. Special care must be taken in the design of any hardware that
would require maintenance.
The Contractor shall provide all special tools and equipment necessary for initial set-up, maintenance, and
servicing operations required throughout the operational life of the equipment. This excludes common
hand tools such as wrenches, sockets, Allen keys, etc. Custom stands, sights and instruments necessary
for initial set-up of the system, debug, and regular maintenance shall be delivered as special tooling and
equipment. Any special fixtures, such as alignment gages and calibration targets, necessary for
assembling parts of the DL-NIRSP shall be deliverable. Special tools shall be marked with the part
number.
Verification: Design Review
Requirement Origin: Engineering
5.3 Commonality of Designs
Wherever possible, the Contractor shall utilize identical equipment and designs throughout the DLNIRSP. The purpose of doing this is to reduce costs associated with design effort, spares, maintenance,
and the like. To the extent possible, the Contractor shall adopt designs used throughout the observatory
for similar equipment to maximize commonality.
Verification: Design Review
Requirement Origin: Engineering
5.4 Conditions of Use
The DL-NIRSP subassemblies shall be capable of being mounted as shown on the corresponding
interface drawings. The equipment shall meet all functional and performance requirements at any
operational condition while mounted as part of the ATST.
Verification: Design Review &, Analysis
Requirement Origin: Engineering
DL-SPEC-0002, Revision A
Page 41 of 41
DL-NIRSP DRD
5.5 Facility Services Interface
The DL-NIRSP subassemblies shall be capable of meeting all functional and performance requirements
while being supplied with facility services as defined in the corresponding specifications and interface
control documents.
Verification: Design Review & Inspection
Requirement Origin: Engineering (SPEC-0063)
5.6 Interfaces
The DL-NIRSP subassemblies shall meet requirements in all applicable ICDs and related drawings.
Verification: Design Review & Inspection
Requirement Origin: Engineering
5.7 General Design Requirements
All analysis shall be in System International ‘metric’ units with Imperial ‘inch’ as secondary units written
in parentheses.
Verification: Design Review & Inspection
Requirement Origin: Engineering (SPEC-0070)
5.8 Electrical System Requirements
TBD
5.9 General Fabrication Requirements
The DL-NIRSP subassemblies shall meet requirements in all applicable specifications regarding
mechanical and software assemblies and all relevant specifications related to environmental conditions.
Verification: Design Review & Inspection
Requirement Origin: Engineering (SPEC-0070)
5.10
Spares
10% of all electro-mechanical components will be provided as spare parts.
5.11
Environmental Requirements
The ATST observatory site is located at an elevation of 3050 meters. This needs to be taken into account
when transporting from sea level to the observatory site.
DL-SPEC-0002, Revision A
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