Keith Noll
SM4 Requirements
Review
July 30, 2003
L.10.4.4 NICMOS Verification Requirements
L.10.4.4.1 Engineering Activation Requirements
L.10.4.4.2 Target Acquisition Requirements
L.10.4.4.3 Optical Requirements
L.10.4.4.4 Calibration Requirements
L.10.4.4.5 NICMOS Cooling System (NCS) Engineering Verification Requirements
L.10.4.4.6 NICMOS/NCS Calibration and Performance Requirements
Keith Noll
SM4 Requirements
Review
July 30, 2003
L.10.4.4.1 Engineering Activation Requirements
L.10.4.4.1.1 The ability to command NICMOS via the
RIU, science data transmission via the SDF, and the
ability of NICMOS to transition between its primary
operational
states
(HOLD,
BOOT,
SAA-OPER,
OPERATE, and OBSERVE) shall be verified.
Verified in normal course of operations.
Keith Noll
SM4 Requirements
Review
July 30, 2003
L.10.4.4.1 Engineering Activation Requirements
L.10.4.4.1.2
Operation of the NICMOS mechanisms
(PAM, FOM, and filter wheels) shall be tested. PAM
motion over the range needed to assure focus in all three
NICMOS cameras (best achievable focus for NIC3) and
+/- 10 steps in X tilt and +/- 12 steps in Y tilt shall be
demonstrated. The ability to reposition the field off-set
mirror (FOM) over the range needed to remove vignetting
in NIC3 shall be demonstrated. Filter wheel motion will be
verified for each filter position
Keith Noll
SM4 Requirements
Review
July 30, 2003
L.10.4.4.1 Engineering Activation Requirements
L.10.4.4.1.2
Operation of the NICMOS mechanisms
(PAM, FOM, and filter wheels) shall be tested. PAM
motion over the range needed to assure focus in all three
NICMOS cameras (best achievable focus for NIC3) and
+/- 10 steps in X tilt and +/- 12 steps in Y tilt shall be
demonstrated. The ability to reposition the field off-set
mirror (FOM) over the range needed to remove vignetting
in NIC3 shall be demonstrated. Filter wheel motion will be
verified for each filter position
Keith Noll
SM4 Requirements
Review
July 30, 2003
L.10.4.4.1 Engineering Activation Requirements
L.10.4.4.1.2
Operation of the NICMOS mechanisms
(PAM, FOM, and filter wheels) shall be tested. PAM
motion over the range needed to assure focus in all three
NICMOS cameras (best achievable focus for NIC3) and
+/- 10 steps in X tilt and +/- 12 steps in Y tilt shall be
demonstrated. The ability to reposition the field off-set
mirror (FOM) over the range needed to remove vignetting
in NIC3 shall be demonstrated. Filter wheel motion will be
verified for each filter position
NICMOS Optical Mecahnisms
Keith Noll
SM4 Requirements
Review
July 30, 2003
L.10.4.4.1 Engineering Activation Requirements
L.10.4.4.1.2
Operation of the NICMOS mechanisms
(PAM, FOM, and filter wheels) shall be tested. PAM
motion over the range needed to assure focus in all three
NICMOS cameras (best achievable focus for NIC3) and
+/- 10 steps in X tilt and +/- 12 steps in Y tilt shall be
demonstrated. The ability to reposition the field off-set
mirror (FOM) over the range needed to remove vignetting
in NIC3 shall be demonstrated. Filter wheel motion will be
verified for each filter position.
Keith Noll
SM4 Requirements
Review
July 30, 2003
L.10.4.4.2 Target Acquisition Requirements
L.10.4.4.2.1 The location of each NICMOS camera aperture
shall be determined with respect to the FGS reference frames
to an accuracy of +/- 2 arcseconds in V2-V3 coordinates and 7
arcminutes in aperture rotation angle for Camera 2 and 1
degree for cameras 1 and 3.
Cycle 7-11 apertures changed position by as much as 1.5
arcsec in NIC1 (~10%)
Keith Noll
SM4 Requirements
Review
July 30, 2003
L.10.4.4.3 Optical Requirements
L.10.4.4.3.1
The optical plate scales at each of the
detector focal planes shall be measured, to a with a
precision of 1/5 pixel in each camera.
Keith Noll
SM4 Requirements
Review
July 30, 2003
Combined dithered stellar
image used to determine
plate scale (NIC1, SM3B).
Keith Noll
SM4 Requirements
Review
July 30, 2003
L.10.4.4.3 Optical Requirements
L.10.4.4.3.2 PAM focus setting should be measured to
establish focus within +/- 1 mm of nominal (best) focus for
each Camera. The encircled energy within a 100 mas
(200 mas for Camera 3) radius of an unresolved point
source shall be measured. We expect to achieve a total
wavefront error of λ/14 or better in all cameras except for
NIC3 in the J band where we expect λ/10.
NICMOS focus sweep
Y-tilt
Coma correction: NIC1 PAM tilt grid
Similar datasets for NIC2
and NIC3 will be obtained
within a few weeks…..
X-tilt
Encircled Energy measurements
Keith Noll
SM4 Requirements
Review
July 30, 2003
L.10.4.4.4 Calibration Requirements
L.10.4.4.4.1 The ability to determine residual pixel-topixel variation using the internal flat-field calibration
source shall be demonstrated.
Keith Noll
SM4 Requirements
Review
July 30, 2003
L.10.4.4.4 Calibration Requirements
L.10.4.4.4.2 The ability to calibrate spectral throughput
shall be demonstrated. The goal is the calibration of the
absolute flux level to an accuracy of approximately
10%. Total instrument throughput shall be determined
and compared to that measured previously.
Keith Noll
SM4 Requirements
Review
July 30, 2003
L.10.4.4.4 Calibration Requirements
L.10.4.4.4.3. The ability to do differential photometry with
a residual measurement error no greater than 3% shall be
demonstrated.
Keith Noll
SM4 Requirements
Review
July 30, 2003
L.10.4.4.4 Calibration Requirements
L.10.4.4.4.4
NICMOS geometric stability will be
characterized as a function of orbital elements, vehicle
orientation, and dewar temperatures by measuring the
lateral motion of the image in the Camera
2 focal plane.
Keith Noll
SM4 Requirements
Review
July 30, 2003
L.10.4.4.4 Calibration Requirements
L.10.4.4.4.5 Detector read noise and dark current shall
be measured. The minimum acceptable levels of
performance are a read noise of </= 40 electrons and a
dark current of </= 2.5 electrons/second.
Keith Noll
SM4 Requirements
Review
July 30, 2003
L.10.4.4.4 Calibration Requirements
L.10.4.4.4.7 HST + NICMOS thermal emission will be
characterized in a subset of spectral elements over the
duration of SMOV.
L.10.4.4.4.9 The photometric and wavelength solutions
for the G096 and G141 grisms will be remeasured.
Keith Noll
SM4 Requirements
Review
July 30, 2003
L. 10.4.4.5 NICMOS Cooling System (NCS)
Engineering Verification Requirements
L.10.4.4.5.1
Configure the NCS to re-cool NICMOS
detectors. The goal during SMOV is to verify the capability to
maintain the weighted average of the neon inlet and outlet
temperatures at a desired setpoint in the range 72-73 K.
L.10.4.4.5.2 Verify the capability of the NCS to achieve a
NICMOS Cold Well temperature (as measured by the 1-1
temperature sensor) of 77 +/- 2 degrees Kelvin and maintain
it within 0.1 K.
Keith Noll
SM4 Requirements
Review
July 30, 2003
L.10.4.4.6 NICMOS/NCS Calibration and Performance
Requirements
L.10.4.4.6.1
The temperatures of each NICMOS detector,
along with its range of variation and the timescales for
variation, shall be determined. Detector temperature stability
shall be characterized over periods of 60 sec, 2000 sec, 24
hours, and 30 days.