Telescope and Instrument Performance Summary (TIPS)

Transcription

1 Telescope and Instrument Performance Summary (TIPS) 19 September 2002 AGENDA 1. HST Focus Status John Krist 2. ACS Status Jennifer Mack 3. WFC3 Status Sylvia Baggett 4. COS Status Ken Sembach Next TIPS Meeting: TBD

2 HST Focus Status September 2002 Last mirror move was mid Current focus monitoring program (9663) simultaneously measures focus at multiple times within an orbit in ACS/HRC and WFPC2/PC every month. Defocus described here in terms of microns of primary-tosecondary mirror separation.

3 focus in secondary (no breathing correction applied) Focus History Focus Measurements Since Last Mirror Move ( ) (no breathing correction) WFPC Focus WFPC Focus WFPC Focus WFPC Focus WFPC Focus DOY

4 Focus Since Last Move Frequency Focus (microns)

5 Frequency Focus (last 6 months) Focus (microns) 6

6 Current Focus Optimization Keep WFPC2/PC within ±1.5 µm of optimal focus (mean over orbit). Focus varies by ~5 µm over the PC field (more over WFC fields) Focus varies by ~10 µm among WFPC2 channels (PC best, WF3 worst) ACS kept confocal with WFPC2 (WFPC2 has no internal focus adjustment)

7 Future Focus Optimization Keep ACS/HRC within ±1.5 µm best focus HRC operates at shorter wavelengths than WFPC2 and is thus more sensitive to focus HRC is better sampled and produces less scatter in focus measurements ACS/WFC focus varies by 4 µm over field Maintain ACS-WFPC2 confocality

8 HRC F220W Predicted EE s m? -2 m? -5 m? Arcsec

9 Recommendations Recommend +3 µm mirror move Optimize focus based on HRC measurements Maintain WFPC2-ACS confocality Above are dependent on latest focus monitor results (data taken yesterday)

10 SPACE TELESCOPE SCIENCE INSTITUTE TIPS Meeting 19 September 2002 Jennifer Mack 1 Hot Pixel Annealing: HRC Riess, Mutchler,Vanorsow, and Cox ~80% of Hot Pixels Annealed Hot Pixels with e/s > Days since March 30th

11 SPACE TELESCOPE SCIENCE INSTITUTE TIPS Meeting 19 September 2002 Jennifer Mack 2 Hot Pixel Annealing: WFC Riess, Mutchler,Van Orsow, and Cox ~60% of Hot Pixels Annealed ~1000 hotpix per day 400 not annealed In 1 year, 1% of pixels will be hot ( like #CRs in 500 s) Need ASCS!! (order of magnitude lower dark rate) Hot Pixels with e/s > Days since March 30th

12 SPACE TELESCOPE SCIENCE INSTITUTE TIPS Meeting 19 September 2002 Jennifer Mack 3 Coronagraph - John Krist Position of occulting spots shifted inflight by ~1 Additional 5 pixel shift between April and June... (Reason Unknown) SIAF updated to include these two shifts Stability monitoring with program 9669

13 SPACE TELESCOPE SCIENCE INSTITUTE TIPS Meeting 19 September 2002 Jennifer Mack 4 Updated ACS Sensitivity WFC 11% > at 7000A De Marchi, Pavlovsky, Bohlin, and Gilliland HRC 9% > at 6000A SBC 19% > at 1250A

14 SPACE TELESCOPE SCIENCE INSTITUTE TIPS Meeting 19 September 2002 Jennifer Mack 5 Flat Fielding: Mack, Bohlin, Gilliland, and Van der Marel Low-order Flat field corrections complete for WFC and HRC Corrections ~ 6 to 18 percent from corner to corner depending on wavelength F330W Earthflats match corrected HRC flats to within few millimag Photometry accurate to 1% for both detectors Accurate to ~2% for interpolated filters F550M, F625W, F660N Polarizer and Coronagraphic Flats in progress... WFC HRC

15 SPACE TELESCOPE SCIENCE INSTITUTE Color-Magnitude Diagrams for 47 Tucanae: TIPS Meeting 19 September 2002 Jennifer Mack 6 ACS Mack et al, ISR B~60 sec V~60 sec I ~60 sec WFPC2 Zoccali et al 2001 B~14,000 sec V~16,000 sec I ~22,000 sec

16 SPACE TELESCOPE SCIENCE INSTITUTE TIPS Meeting 19 September 2002 Jennifer Mack 7 ACS Pipeline status: Hack and Van Orsow OPUS 14.1 installed (05-Sept-2002) CALACS version 4.1b (19-Aug-2002) PyDrizzle version 3.3 (12-Aug-2002) Uses 4th-order geometric distortion correction Upcoming Activities: Polarizer and Coronagraphic Flats in progress Velocity abberations cause plate scale changes correction to be implemented in CALACS fix will improve combination of CR-SPLIT data Photometric transformations to ground, SDSS, WFPC2 Sirianni, Gilliland, and Mack

17 TIPS WFC3 Status Sept 19, UVIS Sub-array Best Focus Curve WFC3 Encircled Energy Testing "Data contained herein is exempt from ITAR regulations under CFR 125.4(13) -- data approved for public disclosure." 19 Sept, 2002 TIPS WFC3 Status 1

18 Meetings/Documentation Pre-Ship Review at Ball (Sept 17) SPIE in Kona (talks by MacKenty, Robberto, booth, slide show) WFC3 Mini-Handbook: SOC review complete, in press (Giavalisco et al.) OP-01: in WOWG review, next release Oct 31 (W.Baggett, ed.). ISRS (online at WFC3 Qualitative Design Orientation and POS TARG Coordinate Definitions (Lupie & Hartig) Wide Field Camera #3 IR and UVIS Filter Wheel Slot Assignments (Lupie) WFC3 UVIS and IR Channel Alignment Properties (Stiavelli) WFC3 Science Calibration Plan Part 2: An Overview of the Pre-flight Data Handling System (Reid) WFC3 Science Calibration Plan Part 1: Overview of Ground-Based Ambient and Thermal Vacuum Calibration Tests (Reid) The reference pixels on the WFC3 IR detectors (Robberto et al.) Internal background and dark current of the IR channel of WFC3 in ambient conditions (Stiavelli) "Data contained herein is exempt from ITAR regulations under CFR 125.4(13) -- data approved for public disclosure." 19 Sept, 2002 TIPS WFC3 Status 2

19 UVIS & IR Image Suites Full Suite IR & UVIS test bench images delivered by Ball according to schedule All images processed and analyzed, fixes implemented by both FSW and pipeline/archive group. WFC3 generic conversion and Keyword Database now in good shape. IR Data Processing Pipeline UVIS Not to scale; only 1 UVIS chip shown "Data contained herein is exempt from ITAR regulations under CFR 125.4(13) -- data approved for public disclosure." 19 Sept, 2002 TIPS WFC3 Status 3

20 Archive and ETC Archive WFC3 tables & catalog defined; CDBS test environment in place. Next step receive and process MEB-generated detector images. Institute-level ETC Development Requirements and test cases delivered to STScI APT. Improved spectra for optical & near-ir sky background (incl. contribution from zodiacal light & Earthshine) now available in ETC. "Data contained herein is exempt from ITAR regulations under CFR 125.4(13) -- data approved for public disclosure." 19 Sept, 2002 TIPS WFC3 Status 4

21 Front End System STScI Front End Development: on schedule. Phase 5: Anneal Mode (proposal instructions, preprocessor, TRANS, & commanding) development done, currently in testing; UVIS subarray requirements gathering has started. Timing & SMS Testing: Boot and Operate macro timing tests nearing completion. UVIS detector timing test ready to run (next step: IR detector and mechanisms). WFC3 Interface (splinter) meeting Ball on Aug 3. Most recent Interface Ball on Sept 16. "Data contained herein is exempt from ITAR regulations under CFR 125.4(13) -- data approved for public disclosure." 19 Sept, 2002 TIPS WFC3 Status 5

22 Front End System Schedule Phase 1 (7/1/00 12/31/00) 1. Macro Definitions Π 2. Reconfigurations Π Phase 2 (1/1/01 6/30/01) 3. Aperture Definitions Π 4. Basic UVIS ACCUM Mode Π 5. UVIS Dark and Bias Calibrations Π Phase 3 (7/1/01 12/31/01) 6. Basic IR MULTIACCUM Mode Π 7. IR Dark Calibrations Π 8. UVIS & IR Tungsten and D 2 Lamp Operations Π Phase 4 (1/1/02 6/30/02) 9. UVIS & IR ALIGN Mode Π 10. SAA Contour Definitions Π 11. UVIS & IR Spatial Patterns Π 12. IR Bright Earth Avoidance Π 13. IR Subarrays Π Phase 5 (7/1/02 12/31/02) 14. Contingency Rework 15. ANNEAL Mode α IN TEST 16. UVIS Subarrays α NEXT ITEM 17. SMOV Special Commanding, Part 1 Phase 6 (1/1/03 6/30/03) 18. SMOV Special Commanding, Part SMGT Preparations 20. UVIS Binning 21. CTE Monitoring Phase 7 (7/1/03 12/31/03) 22. UVIS Post-Flash Capability 23. Autoimage Insertion for UVIS Prism Operations 24. IR Automatic Post-SAA Darks Notes : -Reconfiguration programming & updates occur in each phase -Test SMS are ready for running on the software benches. "Data contained herein is exempt from ITAR regulations under CFR 125.4(13) -- data approved for public disclosure." 19 Sept, 2002 TIPS WFC3 Status 6

23 Detectors - UVIS Ball completing final stages of enclosure for flight build 1. DCL has completed data acquisition on irradiated devices 152 (2.5 & 5 yr) & 189 (1 yr). Performance trade study underway: charge injection vs preflash. Science IPT to consult with SOC, then make recommendation to the project. "Data contained herein is exempt from ITAR regulations under CFR 125.4(13) -- data approved for public disclosure." 19 Sept, 2002 TIPS WFC3 Status 7

24 Detectors - IR FPA32 Mechanical failure of TEC during early installation. No obvious problem: not TEC problem, qual unit successfully bonded. Ball is working on it. Fabrication of Lot 7 detectors for WFC3 at Rockwell is ahead of schedule. Expected to have FPA50 s QE, stability of FPA32. Processing intended to minimize the dark current instabilities of the detectors. FPA TEC "Data contained herein is exempt from ITAR regulations under CFR 125.4(13) -- data approved for public disclosure." 19 Sept, 2002 TIPS WFC3 Status 8

25 Detectors IR QE curves "Data contained herein is exempt from ITAR regulations under CFR 125.4(13) -- data approved for public disclosure." 19 Sept, 2002 TIPS WFC3 Status 9

26 Detectors IR testing of Lot 7 Testing of the first Lot 7 parts is underway at RSC. Team personnel visited RSC on Sept. 10 to discuss the initial results of first 2 units. - Excellent QE, nearly perfect cosmetically. - Dark current unacceptably high; processing for subsequent detectors to be adjusted. Num Of pixels Dark current (e-/s/pix) "Data contained herein is exempt from ITAR regulations under CFR 125.4(13) -- data approved for public disclosure." 19 Sept, 2002 TIPS WFC3 Status 10

27 Optical Alignment Optical Alignment at Ball Supported test activities, analyses of PSFs and modelling. WFC3 Optical Bench in the clean room with test equipment being readied for optical alignment "Data contained herein is exempt from ITAR regulations under CFR 125.4(13) -- data approved for public disclosure." 19 Sept, 2002 TIPS WFC3 Status 11

28 First Light First light on the UVIS channel : 9:20AM MST 8/10/02 "Data contained herein is exempt from ITAR regulations under CFR 125.4(13) -- data approved for public disclosure." 19 Sept, 2002 TIPS WFC3 Status 12

29 First Light Image In ground testing the 633nm UVIS PSF beats the encircled energy spec and goal performance. IR currently being done. "Data contained herein is exempt from ITAR regulations under CFR 125.4(13) -- data approved for public disclosure." 19 Sept, 2002 TIPS WFC3 Status 13

30 SPACE TELESCOPE SCIENCE INSTITUTE Operated for NASA by AURA TIPS / COS 19 September 2002

31 Overview New Instrument Scientist (Scott Friedman) STScI ground system development on schedule Instrument integrated, in alignment at Ball SI Environmental (Thermal-Vac): January/March 2003 SI delivery to GSFC: Late March 2003 Launch: April 2004 SM4 replace COSTAR Sembach - 19 September 2002 Slide 2 of 8

32 COS Instrument Activities Science instrument news since last TIPS presentation (June 02) FUV flight detector (with new QE grid) qualified, installed and aligned in instrument Fully integrated instrument currently undergoing alignment at Ball > Gaseous N 2 purge > Light passed through both NUV and FUV optical paths > Initial rough alignment of all optics is excellent Fine alignment will begin soon > Problem noted with RAS/Cal chief ray alignment > ABA to be used to calibrate and reset RAS/Cal FUV spare detector being assembled > Mechanical assemblies (door, actuators, etc), QE grid installed > Final QE measurement in mid-october Sembach - 19 September 2002 Slide 3 of 8

33 COS Instrument Activities SI news (continued) Optic select mechanism (OSM) life test unit undergoing bench testing > Determine OSM repeatability and stability properties > Necessary for FP-POS (FP-SPLIT) timing and auto-wavecal usage Primary D 2 lamp in cal-platform failed during pre-alignment platform random vibration / sine burst testing > Defective lamp, problem understood, replacement lamp to be vibe tested and installed after the N 2 alignment testing Thermal controller set point issue > Lower than the expected NUV MAMA survivability temperature > Important only in worst-case scenario (extended HST safing / lowpower with several additional problems) Sembach - 19 September 2002 Slide 4 of 8

34 STScI Integrated Scheduling System Phase 5 development completed Auto-wavecals completed All primary science / calibration exposure development is now complete Phase 6 development is in progress Bright object protection target screening document drafted, circulated > Instrument Science Report to be filed (Leitherer) Initial preparations for SMOV begun > Discussions initiated with IDT > Meeting at STScI next week (called by Carl Biagetti) Sembach - 19 September 2002 Slide 5 of 8

35 COS Phase Development Plan (Rev 6, 10/26/01) Phase 1 (1/1/00 6/30/00) Macro Development Reconfigurations Phase 2 (7/1/00 12/31/00) NUV Timetag Mode + Darks FUV Timetag Mode + Darks Phase 3 (1/1/01 6/30/01) FUV & NUV Accumulation Science Exposures FUV & NUV Target Acquisition Exposures FUV & NUV Target Peakup Exposures Phase 4 (7/1/01 12/31/01) Aperture Alignment Exposures OSM1 Focus Alignment Exposures OSM1 Rotation Alignment Exposures OSM2 Rotation Alignment Exposures FUV & NUV FP Split Exposures Phase 5 (1/1/02 6/30/02) FUV & NUV GO Wavelength Calibration Exposures FUV & NUV Flat Field Lamp Calibration Exposures FUV & NUV Automatic Wavelength Calibration Exposures SAA Contours Phase 6 (7/1/02 12/31/02) SMGT Preparations SMOV Special Commanding FUV & NUV Anomalous Recovery FUV & NUV Initial Turn-on FUV & NUV BOP Target Screening Phase 7 (1/1/03 6/30/03) FUV & NUV Lifetime Adjustments Coordinated Parallels Sembach - 19 September 2002 Slide 6 of 8

36 COS Back-End Activities COS Pipeline (CALCOS) Most modules are now complete Spectral merging procedures for FP-POS positions in progress Full testing to occur this fall on integrated SI data Draft of ICD-47 now exists (P. Hodge) and is being reviewed COS Header Keywords Standard header keyword selections/definitions for science and ACQ exposures completed Established COS association requirements Sembach - 19 September 2002 Slide 7 of 8

37 COS User Support Development COS mini-handbook Provides observers with basic information about instrument capabilities available in Cycle 13 Finalized with revised FUV detector QE estimates (October distribution) COS exposure time calculator Spectroscopic ETC requirements revisited (Astronomer Proposal Tools environment) COS implementation to occur over next 6 months Sembach - 19 September 2002 Slide 8 of 8

38 MEMORANDUM TO: Distribution DATE: September 19, 2002 SUBJECT: Questions and Answers from TIPS Meeting on 19 September 2002 Hubble Division/Mission Perspective Presenter Rodger Doxsey No questions. HST Focus Status Presenter John Krist Q: When will the decision be made on a recommendation for a mirror move? If the new data do suggest the continuation of focus degradation, how long will it take to schedule the mirror move? A: At this point it is highly probable that we will have a mirror move. The scheduling process will take a couple of weeks. Q: Regarding the WFPC2 and ACS focuses, how can we tell that they are at the same focus? Is there any time dependency? A: For the monitoring program, WFPC2 and ACS observations were taken simultaneously. At present, the assumption is that there is no time dependency, but we will continue to monitor the focus as part of an ongoing program. Q: Would the mirror move affect NICMOS? A: No. The 3 µm mirror move will not be very significant for NICMOS since it operates at longer wavelengths. Q: How many measurements using the HRC have been made? A: 16 measurements per orbit per visit for the ACS/HRC. 12 measurements per orbit per visit for WFPC2. Q: Do we understand the breathing? A: The existing breathing model does not work with the current setup. We will need to update the breathing model to accommodate the present configuration. ACS Status Presenter Jennifer Mack Q: Did we inform the astronomical community regarding the recent updates to CALACS and PyDrizzle? A: Announcements were made in the last STAN, and we have posted tables summarizing the changes on the ACS web page. Q: How are the hot pixels defined for ACS? A: A hot pixel is defined as having a dark count greater than 0.08 electrons/seconds for the HRC, and greater than 0.04 electrons/seconds for the WFC. The median dark current is 7 counts/hour. 1

39 WFC3 Status Presenter Sylvia Baggett Q: Do we have any information on the stability and the read noise level of the new IR detectors? A: At this time we do not have any. Q: Do we know for sure that the high dark current problems with the IR detectors are due to the machine used for the manufacturing process? A: Rockwell traced the problem back to the machine. The manufacturing process was moved to a new facility, and the machine used was only at its first initial run. Data gathered seemed to indicate that the observed problem is consistent with the machine setup. Rockwell will go back to the old facility and use the old machine to manufacture the new detectors. Q: When will WFC3 be shipping to GSFC? A: The electronics are coming now, and the optical bench will ship by October 1 st. COS Status Presenter Ken Sembach Q: Do we expect the QE to be better with the spare detector? A: Yes, we do expect the QE to be better due to the modification of the fabrication process. Q: When will COS be going through testing against flight software? A: The testing will go on in the fall, consisting of both timing tests and commanding tests. 2