13103( 2) - 11-Sep-2012 12:48:55 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 13103 Version: 2 Check-in Time: 11-Sep-2012 12:48:55 STScI Edit Number: 1 Title WFC3/UVIS Anneal ------------------------------------------------------------------------------------ Type Cycle CAL/WFC3 19 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Sylvia M. Baggett Space Telescope Science Institute Y CoI: Dr. John A. Biretta Space Telescope Science Institute N ------------------------------------------------------------------------------------ Abstract The on-orbit radiation environment of WFC3 continually generates new hot pixels. This proposal performs the procedure required for repairing those hot pixels in the UVIS CCDs. During an anneal, the two-stage thermo-electric cooler (TEC) is turned off and the four-stage TEC is used as a heater to bring the UVIS CCDs up to ~20C. As a result of the CCD warmup, a large fraction of the hot pixels are fixed. UVIS bias and dark frames are taken before and after each anneal, to allow an assessment of the procedure's effectiveness, provide a check of readnoise, bias, global dark current, and hot pixel levels, as well as support hysteresis (bowtie) monitoring and CDBS reference file generation. One IR dark is taken after each anneal, to provide a check of the IR detector. ------------------------------------------------------------------------------------ Observations Description ------------------------ The anneal procedures are performed every four weeks. Full-frame, unbinned UVIS bias and dark frames (3 and 5 images, respectively) are obtained immediately prior to and following each anneal; the data provide a means of monitoring changes due to the detector warmup. In addition, a bowtie monitor is run directly after the anneal, in the event that hysteresis effects were induced by the warmup. SEQ-WITHIN has been used to ensure that all visits from a given anneal iteration execute in order. No WFC3 science imaging should be done between the pre- and post-anneal internals. Due to thermal requirements, the IR detector must be warmed somewhat during a UVIS anneal (from -128 to -90) but the temperature change is kept to a minimum in order to minimize cycling on the IR, a restricted item. This warming may be discontinued in the future but until then, to evaluate the state of the IR detector after it has been cooled back down, one SPARS50 dark exposure is taken after each anneal. The IR dark visit is included in this proposal rather than in the dark monitor proposal in order to ensure the post-anneal linkage. It is placed in its own visit, following the post-anneal UVIS darks rather than included with the UVIS exposures to facilitate its removal, if warranted, at some later date. Real Time Justification ----------------------- 13103( 2) - 11-Sep-2012 12:48:55 - [ 2] Calibration Justification ------------------------- The acquired bias and dark frames will be compared to baseline images, readnoise and global dark current will be measured, hot pixel changes will be monitored, and the effectiveness of each anneal procedure will be evaluated. UVIS dark frames will be inspected for evidence of any hysteresis (bowtie) effects; the bowtie monitor visit after the anneal also serves as a bowtie check and neutralizer if needed. Bias and dark data will be combined with that from other proposals to generate superbias and superdark reference files for the calibration pipeline. Additional Comments ------------------- This proposal extends the original Cycle 19 anneal proposal through October 2012. The Cycle 20 calibration program will run from Nov 2012 to the end of Oct 2013. ------------------------------------------------------------------------------------ 13103( 2) - 11-Sep-2012 12:48:55 - [ 3] Visit: A1 Visit Requirements: BETWEEN 08-OCT-2012:00:00:00 AND 12-OCT-2012:23:59:59; SEQ A1, A2, A3, A4, A5 WITHIN 72.0 H On Hold Comments: Additional Comments: No WFC3 UVIS science should be scheduled between visits; strongly prefer to have the visits scheduled back-to-back. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 BIAS WFC3/UVI ACCUM UVIS DEF 1 0.0 S S ------------------------------------------------------------------------------------------------------------------------------------ 2 BIAS WFC3/UVI ACCUM UVIS DEF 1 0.0 S S ------------------------------------------------------------------------------------------------------------------------------------ 3 DARK WFC3/UVI ACCUM UVIS DEF 1 900.0 S S ------------------------------------------------------------------------------------------------------------------------------------ 4 DARK WFC3/UVI ACCUM UVIS DEF 1 900.0 S S ------------------------------------------------------------------------------------------------------------------------------------ 5 BIAS WFC3/UVI ACCUM UVIS DEF 1 0.0 S S ------------------------------------------------------------------------------------------------------------------------------------ 6 DARK WFC3/UVI ACCUM UVIS DEF 1 900.0 S S ------------------------------------------------------------------------------------------------------------------------------------ 7 DARK WFC3/UVI ACCUM UVIS DEF 1 900.0 S S ------------------------------------------------------------------------------------------------------------------------------------ 8 DARK WFC3/UVI ACCUM UVIS DEF 1 900.0 S S ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ BIAS 1 WFC3/UVI ACCUM UVIS DEF none none none none 1 N/A S BIAS 2 WFC3/UVI ACCUM UVIS DEF none none none none 1 N/A S DARK 3 WFC3/UVI ACCUM UVIS DEF none none none none 1 N/A S DARK 4 WFC3/UVI ACCUM UVIS DEF none none none none 1 N/A S BIAS 5 WFC3/UVI ACCUM UVIS DEF none none none none 1 N/A S 13103( 2) - 11-Sep-2012 12:48:55 - [ 4] Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ DARK 6 WFC3/UVI ACCUM UVIS DEF none none none none 1 N/A S DARK 7 WFC3/UVI ACCUM UVIS DEF none none none none 2 N/A S DARK 8 WFC3/UVI ACCUM UVIS DEF none none none none 2 N/A S 13103( 2) - 11-Sep-2012 12:48:55 - [ 5] Visit: A2 Visit Requirements: On Hold Comments: Additional Comments: Using minimum default value + 1sec. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 NONE WFC3 ANNEAL IRTEMP=COLD 1 0. S ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ NONE 1 WFC3 ANNEAL none none none none 1 N/A 13103( 2) - 11-Sep-2012 12:48:55 - [ 6] Visit: A3 Visit Requirements: On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 TUNGSTEN WFC3/UVI ACCUM UVIS F475X BIN=3 1 1.0 S SEQ 1-3 NON-INT S ------------------------------------------------------------------------------------------------------------------------------------ 2 TUNGSTEN WFC3/UVI ACCUM UVIS F475X BIN=3 1 200.0 S S ------------------------------------------------------------------------------------------------------------------------------------ 3 TUNGSTEN WFC3/UVI ACCUM UVIS F475X BIN=3 1 1.0 S S ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ TUNGSTEN 1 WFC3/UVI ACCUM UVIS F475X none none none none 1 N/A S TUNGSTEN 2 WFC3/UVI ACCUM UVIS F475X none none none none 1 N/A S TUNGSTEN 3 WFC3/UVI ACCUM UVIS F475X none none none none 1 N/A S 13103( 2) - 11-Sep-2012 12:48:55 - [ 7] Visit: A4 Visit Requirements: On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 BIAS WFC3/UVI ACCUM UVIS DEF 1 0.0 S S ------------------------------------------------------------------------------------------------------------------------------------ 2 BIAS WFC3/UVI ACCUM UVIS DEF 1 0.0 S S ------------------------------------------------------------------------------------------------------------------------------------ 3 DARK WFC3/UVI ACCUM UVIS DEF 1 900.0 S S ------------------------------------------------------------------------------------------------------------------------------------ 4 DARK WFC3/UVI ACCUM UVIS DEF 1 900.0 S S ------------------------------------------------------------------------------------------------------------------------------------ 5 BIAS WFC3/UVI ACCUM UVIS DEF 1 0.0 S S ------------------------------------------------------------------------------------------------------------------------------------ 6 DARK WFC3/UVI ACCUM UVIS DEF 1 900.0 S S ------------------------------------------------------------------------------------------------------------------------------------ 7 DARK WFC3/UVI ACCUM UVIS DEF 1 900.0 S S ------------------------------------------------------------------------------------------------------------------------------------ 8 DARK WFC3/UVI ACCUM UVIS DEF 1 900.0 S S ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ BIAS 1 WFC3/UVI ACCUM UVIS DEF none none none none 1 N/A S BIAS 2 WFC3/UVI ACCUM UVIS DEF none none none none 1 N/A S DARK 3 WFC3/UVI ACCUM UVIS DEF none none none none 1 N/A S DARK 4 WFC3/UVI ACCUM UVIS DEF none none none none 1 N/A S BIAS 5 WFC3/UVI ACCUM UVIS DEF none none none none 1 N/A S DARK 6 WFC3/UVI ACCUM UVIS DEF none none none none 1 N/A S 13103( 2) - 11-Sep-2012 12:48:55 - [ 8] Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ DARK 7 WFC3/UVI ACCUM UVIS DEF none none none none 2 N/A S DARK 8 WFC3/UVI ACCUM UVIS DEF none none none none 2 N/A S 13103( 2) - 11-Sep-2012 12:48:55 - [ 9] Visit: A5 Visit Requirements: On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 DARK WFC3/IR MULTIAC IR BLANK SAMP-SEQ=SPARS50, NSAMP=15 1 DEF CUM ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ DARK 1 WFC3/IR MULTIAC IR BLANK none none none none 1 N/A CUM 13103( 2) - 11-Sep-2012 12:48:55 - [ 10] Summary Form for Proposal 13103 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures IR, UVIS ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFC3, WFC3/IR, WFC3/UVIS ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM, ANNEAL, MULTIACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters BIN=3, IRTEMP=COLD, NSAMP=15, SAMP-SEQ=SPARS50 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements BETWEEN 08-OCT-2012:00:00:00 AND 12-OCT-2012:23:59:59, SEQ 1-3 NON-INT, SEQ A1, A2, A3, A4, A5 WITHIN 72.0 H ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements BLANK, DEF, F475X ------------------------------------------------------------------------------------------------------------------------------------ Target Names BIAS, DARK, NONE, TUNGSTEN ------------------------------------------------------------------------------------------------------------------------------------