1 TIPS May 17, 2007 WFC3 Ambient Calibration #2 Results H. Bushouse

2 TIPS May 17, 2007 Ambient Cal #2 Overview WFC3 ambient calibration #2 ran from April 13-19, 2007 –WFC3 in the GSFC SSDIF clean room –Latched into Radial Instrument Alignment Fixture (RIAF) and “CASTLE” optical stimulus –UVIS channel operations only (IR can’t be cooled sufficiently in ambient) –UVIS-2 detector with CCD’s at -54 C (vs. -83 C flight temp) Goals: –Verify re-integrated instrument operations –Verify successful lien closures –First look at UVIS-2 in (nearly) flight-like conditions –Verify operations of ground support equipment to be used in thermal- vac #2 –Train and verify operations of support personnel

3 TIPS May 17, 2007 Instrument Preparations for Ambient Cal #2 WFC3 closeout just prior to top cover installationWFC3 top cover installed WFC3 lift from Low Level Positioner (LLP) WFC3 inserted into Radial Instrument Alignment Fixture (RIAF)

4 TIPS May 17, 2007 Accomplishments ~30 SMSs, ~110 hours, 1525 images –Optical stimulus verification –UVIS-2 detector alignment check –System throughput with UVIS-2 –Filter ghost check (lien related) –CCD electronic crosstalk check (lien related) –UVIS grism calibration: throughput, dispersion, and flat fields –Internal Calibration Subsystem check (lien related) –UVIS-2 bias, dark, readnoise, gain measurements –UV flats signal level check –Encircled energy check –CCD charge injection test –First test of CCD Extended Pixel Edge Response (EPER) mode Excellent job by I&T, Ops, CASTLE & Sci Cal teams

5 TIPS May 17, 2007 Thanks are due … IS’s –S. Baggett, T. Brown, H. Bushouse, G. Hartig, A. Martel, L. Petro, M. Robberto DA’s –E. Barker, M. Cracraft, B. Hilbert, S. Holfeltz, D. Karakla, J. Kim, K. Lindsay, D. Long, R. Lucas, J. Mack, H. McLaughlin, C. Pavlovsky, B. Shaw, E. Smith, M. Sosey

6 TIPS May 17, 2007 Instrument Science Reports ISR : WFC3 Ambient-2 Testing: UVIS Readnoise S. Baggett 11 May 2007 ISR : WFC3 Ambient-2 Testing: Calibration Subsystem Performance S. Baggett 7 May 2007 ISR : UVIS CCD EPER CTE measurements M. Robberto 30 Apr 2007 ISR : WFC3 Ambient-2 Testing: UVIS Gain Results S. Baggett 27 Apr 2007 ISR : WFC3 Ambient Testing: UVIS Dark Current Rate B. Hilbert 26 Apr 2007 ISR : UVIS Channel Filter Ghosts after Filter Replacement T. Brown 26 Apr 2007 ISR : Searching for Scattered Light on the WFC3 UVIS-2 Detector T. Brown 24 Apr 2007 ISR : WFC3 System Throughput on the UVIS Build 2 Detector T. Brown 19 Apr 2007

7 TIPS May 17, 2007 System Throughput with UVIS-2 UVIS-2 QE better than predicted Response of both CCDs comparable to UVIS-1 chip 1 UVIS-2 curves subject to small revision at proper operating temp Optics throughput appears to have held up well since 2004 TV#1 From STScI Instrument Science Report WFC (Tom Brown)

8 TIPS May 17, 2007 UVIS Detector Throughput Comparison UVIS-1 wins in blue; UVIS-2 wins in red F225W only important filter for which response differs by >10%

9 TIPS May 17, 2007 Excellent Read Noise w/ UVIS-2 Like UVIS-1, UVIS-2 demonstrates “goal” level read noise of 3 e - rms, vs. spec of 4; very important in UV Gain = 1 e - /DNUVIS-2 (ambient)UVIS-1 (ambient) Amp A Amp B Amp C Amp D Gain = 1.5 e - /DN Amp A Amp B Amp C Amp D S. Baggett

10 TIPS May 17, 2007 UVIS Crosstalk Satisfactorily Resolved Extended source crosstalk (which could result from very low level signals) is now undetectable (<0.1 e - ) –Combination of hardware change and timing pattern change –New timing patterns show slightly improved read noise as well (had been concerned they might have higher noise) No crosstalk in 2-amp readouts (i.e. from CCD to CCD) In 4-amp readout, small level of crosstalk remains from saturated sources only –New timing patterns slightly improve that level as well –What remains is not a significant issue preliminary analysis by S. Baggett

11 TIPS May 17, 2007 UVIS Crosstalk Satisfactorily Resolved (2) Performance w/Hardware Rev & New CCD Timing Patterns Original Problem window-CCD ghostfilter-CCD ghost source stimulus artifacts crosstalk

12 TIPS May 17, 2007 Internal Cal Subsystem Illumination Improved Severe glints reduced; see F390M flats below Count rate specs achieved As shown previously w/UVIS-1, Deuterium flats much improved in uniformity (2× vs. 5-10×) F390M (inverse) flat beforeF390M flat now

13 TIPS May 17, 2007 UVIS Grism Throughput Measured H. Bushouse UVIS grism is WF/PC-1 spare; very little surviving data Data provided to SOC for ERS planning

14 TIPS May 17, 2007 CCD Charge Injection Working Properly Mean charge injection signal level ~16,000 e - /pix Noise in a single column ~15 e - rms Much greater CTE benefit than from a lamp pre-flash of equivalent noise level

15 TIPS May 17, 2007 Improved Filter Ghost Performance Confirmed Ambient cal measurements confirm the improved ghost performance of the filters replaced in the SOFA Biggest success stories: F225W (<0.4% vs. 15%), F606W (elimination of point-like ghosts), F280N (0.6% vs % in ghost and horrific scattered light flares) Old F225W New F225W

16 TIPS May 17, 2007 UVIS-2 Detector Alignment UVIS-2 aligned at Ball on 30 Jan ’07 –used new, direct, “through the window” alignment transfer from UVIS-1 to UVIS-2 UVIS-2 within tolerance in 4 degrees of freedom, out in 2 Additional adjustment of tip/tilt is desirable, if misalignment is confirmed in upcoming TV#2 testing

17 TIPS May 17, 2007 UVIS-2 Misalignment Consequences At best focus, the performance degradation due to the current level of tip/tilt misalignment is negligible, however … OTA breathing exacerbates the misalignment, causing a small loss of performance over field, especially at short wavelengths –Slight EE loss in small apertures –PSF change (due to field dependent astigmatism inherent in optical design)

18 TIPS May 17, 2007 What’s Next? IR-1 detector package installation –Received at GSFC yesterday (5/16); installation today System Level Thermal-Vac #2 –WFC3, with UVIS-2 and IR-1, into SES chamber ~5/29 –Ambient system functionals and alignment check ~6/1-6/5 –Vacuum testing for following ~75 days 24/7 support from STScI IS’s, DA’s, and Ops –Proto-flight qualification of instrument Thermal cycling Performance of all thermal systems Full science calibration of UVIS and IR channels CEI specifications verification

19 TIPS May 17, 2007 IR FPA QEs

20 TIPS May 17, 2007 Backup slides

21 TIPS May 17, 2007 UVIS-2 Misalignment EE Penalty Optimal As-is OTA SM despace: +3  Nom -3  Detector alignment: Optimal As-is

22 TIPS May 17, 2007 PSF Change with OTA Breathing -3  00 +3  UVIS-2 CASTLE 633nm UV-11

23 TIPS May 17, 2007 FPA 160 Dark Current

24 TIPS May 17, 2007 FPA 160 Persistence

25 TIPS May 17, 2007 FPA 160 Read Noise CDS Noise (e - rms) FPA 64 (IR2)24 FPA 129 (IR1)22 FPA 150 (IR3)24 FPA FPA 16524

26 TIPS May 17, 2007 FPA 165 QE

27 TIPS May 17, 2007 SMGT preparations Revised SMGT Part 2 SMS –Added UVIS Anneal exposures –Revised management of tungsten & D2 lamps –Corrected UVIS quad filter commanding –Duration of SMS is 20.5 hours Delivered SMS 3/30/2007 for test –SMS ran successfully in VSTIF 4/23/2007 –Science data ftp’ed to STScI for OPUS processing Revised SOGS Support Schedules for SM4 Functional Test –Science data from Early VEST test ftp’ed to STScI for OPUS processing Prepared OPUS for processing of VSTIF and Early VEST data –Anomalies identified from February VSTIF run corrected –Software testing and delivery complete by 5/2/2007

28 TIPS May 17, 2007 SMGT Part 2 SMS Content

29 TIPS May 17, 2007 Preparation of SMGT Part 2 SMS AnomalySubsystemAssigneeStatus Update UVIS & IR filters (F588N  F200LP & F098W  F140W) APT, IMESSClosed Errors in SIAF aperture specificationsTRANSOBS/TELClosed Incorrect reporting: errors for NICMOS; CR- SPLIT exp. APTOEDClosed ANNEAL not usedN/AINS/WFC3Closed Detector temperature set-points raised for ambient IMOEDClosed Mosaic dithers generate pointing warningsAPTOEDClosed Tungsten lamp on during readoutsTRANSINS/WFC3Closed Patch SMS for CS 3.0 D limitsIMOEDClosed Error inhibiting 6-stage TEC for ambient testsIMOEDClosed

30 TIPS May 17, 2007 SMGT VSTIF Results AnomalySubsystemAssigneeStatus UVIS full-frame exposures fail in Generic ConversionOPUS/GCDPTClosed Errors in IR dark reference file keyword valuesCDBSINS/WFC3Closed Incorrect IR dark reference file selection for subarraysCDBSINS/WFC3Closed IR subarray format not listed in science image headersKWDBDPTClosed Incorrect WFC3 SIAF valuesSIAFOBS/TELClosed Incorrect CCD amp selection for UVIS Quad filtersCommandingSCSBClosed Inadequate representation of UVIS Quad filters in useOPUS/GCINS/WFC3Open Generic Conversion still using old IR readout timesOPUS/GCDPTClosed Incorrect PRIMESI keyword valuesOPUS/GCDPTClosed Incorrect PHOTMODE keyword valuesCALWF3INS/WFC3Closed CALWF3 IR dark frame selection enhancementCALWF3INS/WFC3Closed Updated IR dark calibration reference files neededCDBSINS/WFC3Closed