SMOV WFC3 11454
Activation Test
(Visits 2&3)
Larry Petro, Howard Bushouse, John MacKenty
May 30, 2009
May 30, 2009
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Contents of the Activation Test
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Proposal 11454 is comprised of 4 parts
– Recovery from SAFE (V01, executed 145/11:00)
– Repeat of SM4 FT (V02 & 03, executed 149/13:00)
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All 10 FT science exposures
Additional IR exposure to move FSM
No TEC operations
Implemented in stored commanding, rather than CCL
– PROTECT to NORMAL transition (V05, planned 159/18:31)
– Detector cooldown (V5A, 06, 07, planned 161/19:00 )
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The purpose of Visits 02 & 03 is verify nominal operation post-release
and before detector cooldown
– Minimizing TEC cooldown cycles is paramount
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Results
– The WFC3 detectors and mechanisms continue to operate nominally
and as expected.
May 30, 2009
2
Activation Test Science Exposures
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Detector operations and mechanism motions were nominal
Fast-track data received from OPUS/PACOR
Images analyzed and found to be nominal & similar to SM4 FT images
Exp.
No.
Exposure Specification
1 UVIS Bias
2 UVIS 20 -sec Dark
3 UVIS Noise
4 UVIS Noise
UVIS 1 -sec F606W,
5 Tungsten Lamp
UVIS 1 -sec F350LP,
6 Tungsten Lamp
7 IR RAPID, NSAMP 7, Dark
8 IR STEP25, NSAMP 7, Dark
9 IR Noise
10 IR Noise
IR F140W, SQ64 subarray,
11 NSAMP 15, Tungsten Lamp
May 30, 2009
Assessment of Science Image
Cosmic Rays visible. Scratches in Amp B quad not visible.
Shading from dark accumulation during readout apparent.
Different Cosmic R ays visible. 2 Scratches in Amp B quad
visible. Dark shading visible. Beach ball and elephant's trunk
visible. Snowballs visible.
Amps AD readout. Nominal appearance.
Std. Dev. = 1.97 DN Amp A.
Amps BC readout . Nominal appearance.
Std. Dev. = 2.12 DN Amp B.
Lamp 1. Nominal appearance. Baffle arcs in corners. Droplet
features. Light signal ~7,500 DN.
Lamp 3. All features similar to F606W. Light signal
~28,000DN.
Saturated. Q1 amplifier corner is rounded, which is nominal.
Single frame shows Death Star.
Saturated. Similar appearance to RAPID.
Nominal. Vertical blocks in single frame. Std. Dev. of
difference of 2 frames = 2.4 DN.
Same as previous. Std. Dev. = 2.4 DN.
Lamp 2. 64x64 subarray with 5 -reference pixel border.
Exposure not in SM4 FT. Demonstrates FSM operation. Also
demonstrates subarray and Tungsten Lamp 2.
Activation
Test Result
Nominal
Nominal
Nominal
Nominal
Nominal
Nominal
Nominal
Nominal
Nominal
Nominal
Nominal
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Comparison with SM4 FT
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Detector temperatures are similar
Signals are similar (within ~5%)
Detector read noise is similar
Quantity
UVIS CCD Temperature
IR FPA Temperature
UVIS Lamp F606W, light
UVIS Lamp F350LP, light
UVIS Elec. Read Noise
IR Elec. Read Noise
May 30, 2009
SM4 FT
DOY 135
2˚ C
-18˚ C
4,530 DN
24,600 DN
2.1 DN
2.4 DN
AT
DOY 149
0˚ C
-28˚ C
4,250 DN
23,700 DN
2.0 DN
2.4 DN
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Comparison of AT and FT Images
Activation Test
SM4 FT
Dark
F606W
Tungsten
Lamp Flat
Field
May 30, 2009
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11454 Processing Status
Of the 11 exposures:
– 8 processed through OPUS & calwf3 without incident and are in MAST
– 3 IR darks failed in calwf3 due to reference file issues
• 2 use non-standard readout modes for which no ref files exist
• 1 failed due to incorrect gain value listed in header of most recent dark ref image,
which caused an older, inappropriate ref file to be selected
• Corrected dark ref files will be delivered to CDBS ASAP
– Work-around is to reprocess without steps that use dark ref images, or wait for
keyword rule update to turn off steps for dark exposures
May 30, 2009
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WFC3 MAST Anomaly
• MAST search request by dataset name (iabs%) returns the 8
exposures that completed processing.
• Searching by instrument name “WFC3”, however, does not
return the 4 UVIS bias and dark exposures.
• MASTWEB PR#62735 has been filed.
May 30, 2009
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