16861( 2) - 14-Dec-2021 21:06:01 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 16861 Version: 2 Check-in Time: 14-Dec-2021 21:06:01 STScI Edit Number: 0 Title Testing a New Method for Pinning Down CTE losses ------------------------------------------------------------------------------------ Type Cycle CAL/WFC3 29 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Jay Anderson Space Telescope Science Institute Y CoI: Benjamin Kuhn Space Telescope Science Institute N ------------------------------------------------------------------------------------ Abstract Understanding CTE losses in WFC3/UVIS has very much been a learning experience. Once it became clear that there were significant losses at the small-electron-packet end, we realized that we needed more than the strategy that had worked so well for ACS: namely, just measuring the trails found behind the warm pixels (WPs) in the calibration long darks. We devised a strategy that used a combination of short-darks and long-darks. The long-darks allowed us to know the true intensity of each warm pixel, and the short darks with variable background allowed us to measure electron-survival as a function of background. This new strategy has worked well, but there are not as many WPs in the short darks as we would like. We experient here with a different approach. We will take the standard 900s long darks with a variety of post-flash levels so that the relative losses-vs-background can be assessed. This approach is not as direct as the short-long approach, but it may provide more data and it is actually more in-line with what actually gets done for science. Also, this new approach provides a lot more WPs to study, which should give us much better resolution on losses as a function of background. The short-dark data taken in the previous calibration cycle has noisy trends for backgrounds between 20e and 100e. This program should remedy that significantly. ------------------------------------------------------------------------------------ Observations Description ------------------------ The observing strategy here is pretty straightforward. We will take long 900s darks at a variety of background levels. The standard calibration programs take 900s darks with zero post-flash background and with 20e added postflash, so this program will supplement those levels with twenty 900s exposures with a wide variety of backgrounds. In the end, we will have long darks with 22 different background levels: (0e), 4e, 8e, 12e, 16e, (20e), 24e, 28e, 35e, 42e, 49e, 46e, 63e, 70e, 77e, 84e, 98e, 126e, 161e, 203e, 252e, and 322e. The reduction plans are straightforward. The routine calibrations will give us around 20x900s darks with PF=20e from the same anneal period of this program. We will stack these images and make a list of the stable WPs. We will next select (say) WPs with between 45e and 55e found in the top ~250 pixels of the 16861( 2) - 14-Dec-2021 21:06:01 - [ 2] detector (i.e., the ones that suffer more than 1750 parallel transfers from the readot register). We will then examine the number of electrons read out for these pixels for the 22 background levels explpored. We can do the same for fainter and brighter WPs. These plots should provide more resolution than we have previously had to explore details in the charge-transfer model. We can of course compare these curves against predictions of the pixel-based model. ------------------------------------------------------------------------------------ 16861( 2) - 14-Dec-2021 21:06:01 - [ 3] Visit: 01 (PF005-PF010) 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| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 DARK-NM WFC3/UVI ACCUM UVIS F487N GAIN=1.5, FLASHCUR=LOW, 1 900.0 S S FLASHEXP=1.5 (900 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 DARK-NM WFC3/UVI ACCUM UVIS F487N GAIN=1.5, FLASHCUR=LOW, 1 900.0 S S FLASHEXP=3.0 (900 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 | ------------------------------------------------------------------------------------------------------------------------------------ DARK-NM 1 WFC3/UVI ACCUM UVIS F487N none none none none 1 N/A S DARK-NM 2 WFC3/UVI ACCUM UVIS F487N none none none none 1 N/A S 16861( 2) - 14-Dec-2021 21:06:01 - [ 4] Visit: 02 (PF015-PF018) Visit Requirements: AFTER 01 BY 0 D TO 5 D 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| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 DARK-NM WFC3/UVI ACCUM UVIS F487N GAIN=1.5, FLASHCUR=LOW, 1 900.0 S S FLASHEXP=4.5 (900 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 DARK-NM WFC3/UVI ACCUM UVIS F487N GAIN=1.5, FLASHCUR=LOW, 1 900.0 S S FLASHEXP=6.0 (900 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 | ------------------------------------------------------------------------------------------------------------------------------------ DARK-NM 1 WFC3/UVI ACCUM UVIS F487N none none none none 1 N/A S DARK-NM 2 WFC3/UVI ACCUM UVIS F487N none none none none 1 N/A S 16861( 2) - 14-Dec-2021 21:06:01 - [ 5] Visit: 03 (PF023-PF026) 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| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 DARK-NM WFC3/UVI ACCUM UVIS F487N GAIN=1.5, FLASHCUR=LOW, 1 900.0 S S FLASHEXP=9.2 (900 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 DARK-NM WFC3/UVI ACCUM UVIS F487N GAIN=1.5, FLASHCUR=MEDIUM, 1 900.0 S S FLASHEXP=0.4 (900 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 | ------------------------------------------------------------------------------------------------------------------------------------ DARK-NM 1 WFC3/UVI ACCUM UVIS F487N none none none none 1 N/A S DARK-NM 2 WFC3/UVI ACCUM UVIS F487N none none none none 1 N/A S 16861( 2) - 14-Dec-2021 21:06:01 - [ 6] Visit: 04 (PF030-PF035) 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| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 DARK-NM WFC3/UVI ACCUM UVIS F487N GAIN=1.5, FLASHCUR=MEDIUM, 1 900.0 S S FLASHEXP=0.5 (900 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 DARK-NM WFC3/UVI ACCUM UVIS F487N GAIN=1.5, FLASHCUR=MEDIUM, 1 900.0 S S FLASHEXP=0.6 (900 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 | ------------------------------------------------------------------------------------------------------------------------------------ DARK-NM 1 WFC3/UVI ACCUM UVIS F487N none none none none 1 N/A S DARK-NM 2 WFC3/UVI ACCUM UVIS F487N none none none none 1 N/A S 16861( 2) - 14-Dec-2021 21:06:01 - [ 7] Visit: 05 (PF040-PF045) 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| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 DARK-NM WFC3/UVI ACCUM UVIS F487N GAIN=1.5, FLASHCUR=MEDIUM, 1 900.0 S S FLASHEXP=0.7 (900 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 DARK-NM WFC3/UVI ACCUM UVIS F487N GAIN=1.5, FLASHCUR=MEDIUM, 1 900.0 S S FLASHEXP=0.8 (900 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 | ------------------------------------------------------------------------------------------------------------------------------------ DARK-NM 1 WFC3/UVI ACCUM UVIS F487N none none none none 1 N/A S DARK-NM 2 WFC3/UVI ACCUM UVIS F487N none none none none 1 N/A S 16861( 2) - 14-Dec-2021 21:06:01 - [ 8] Visit: 06 (PF050-PF060) 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| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 DARK-NM WFC3/UVI ACCUM UVIS F487N GAIN=1.5, FLASHCUR=MEDIUM, 1 900.0 S S FLASHEXP=0.9 (900 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 DARK-NM WFC3/UVI ACCUM UVIS F487N GAIN=1.5, FLASHCUR=MEDIUM, 1 900.0 S S FLASHEXP=1.0 (900 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 | ------------------------------------------------------------------------------------------------------------------------------------ DARK-NM 1 WFC3/UVI ACCUM UVIS F487N none none none none 1 N/A S DARK-NM 2 WFC3/UVI ACCUM UVIS F487N none none none none 1 N/A S 16861( 2) - 14-Dec-2021 21:06:01 - [ 9] Visit: 07 (PF070-PF085) 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| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 DARK-NM WFC3/UVI ACCUM UVIS F487N GAIN=1.5, FLASHCUR=MEDIUM, 1 900.0 S S FLASHEXP=1.1 (900 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 DARK-NM WFC3/UVI ACCUM UVIS F487N GAIN=1.5, FLASHCUR=MEDIUM, 1 900.0 S S FLASHEXP=1.2 (900 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 | ------------------------------------------------------------------------------------------------------------------------------------ DARK-NM 1 WFC3/UVI ACCUM UVIS F487N none none none none 1 N/A S DARK-NM 2 WFC3/UVI ACCUM UVIS F487N none none none none 1 N/A S 16861( 2) - 14-Dec-2021 21:06:01 - [ 10] Visit: 08 (PF100-PF125) 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| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 DARK-NM WFC3/UVI ACCUM UVIS F487N GAIN=1.5, FLASHCUR=MEDIUM, 1 900.0 S S FLASHEXP=1.4 (900 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 DARK-NM WFC3/UVI ACCUM UVIS F487N GAIN=1.5, FLASHCUR=MEDIUM, 1 900.0 S S FLASHEXP=1.8 (900 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 | ------------------------------------------------------------------------------------------------------------------------------------ DARK-NM 1 WFC3/UVI ACCUM UVIS F487N none none none none 1 N/A S DARK-NM 2 WFC3/UVI ACCUM UVIS F487N none none none none 1 N/A S 16861( 2) - 14-Dec-2021 21:06:01 - [ 11] Visit: 09 (PF160-PF200) 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| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 DARK-NM WFC3/UVI ACCUM UVIS F487N GAIN=1.5, FLASHCUR=MEDIUM, 1 900.0 S S FLASHEXP=2.3 (900 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 DARK-NM WFC3/UVI ACCUM UVIS F487N GAIN=1.5, FLASHCUR=MEDIUM, 1 900.0 S S FLASHEXP=1.9 (900 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 | ------------------------------------------------------------------------------------------------------------------------------------ DARK-NM 1 WFC3/UVI ACCUM UVIS F487N none none none none 1 N/A S DARK-NM 2 WFC3/UVI ACCUM UVIS F487N none none none none 1 N/A S 16861( 2) - 14-Dec-2021 21:06:01 - [ 12] Visit: 10 (PF250-PF300) 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| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 DARK-NM WFC3/UVI ACCUM UVIS F487N GAIN=1.5, FLASHCUR=MEDIUM, 1 900.0 S S FLASHEXP=3.6 (900 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 DARK-NM WFC3/UVI ACCUM UVIS F487N GAIN=1.5, FLASHCUR=MEDIUM, 1 900.0 S S FLASHEXP=4.6 (900 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 | ------------------------------------------------------------------------------------------------------------------------------------ DARK-NM 1 WFC3/UVI ACCUM UVIS F487N none none none none 1 N/A S DARK-NM 2 WFC3/UVI ACCUM UVIS F487N none none none none 1 N/A S 16861( 2) - 14-Dec-2021 21:06:01 - [ 13] Summary Form for Proposal 16861 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures UVIS ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFC3/UVIS ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters FLASHCUR=LOW, FLASHCUR=MEDIUM, FLASHEXP=0.4, FLASHEXP=0.5, FLASHEXP=0.6, FLASHEXP=0.7, FLASHEXP=0.8, FLASHEXP=0.9, FLASHEXP=1.0, FLASHEXP=1.1, FLASHEXP=1.2, FLASHEXP=1.4, FLASHEXP=1.5, FLASHEXP=1.8, FLASHEXP=1.9, FLASHEXP=2.3, FLASHEXP=3.0, FLASHEXP=3.6, FLASHEXP=4.5, FLASHEXP=4.6, FLASHEXP=6.0, FLASHEXP=9.2, GAIN=1.5 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements AFTER 01 BY 0 D TO 5 D ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F487N ------------------------------------------------------------------------------------------------------------------------------------ Target Names DARK-NM ------------------------------------------------------------------------------------------------------------------------------------