Telescope and Instrument Performance
Summary (TIPS)
19 September 2002
AGENDA
1.
2.
3.
4.
HST Focus Status
ACS Status
WFC3 Status
COS Status
John Krist
Jennifer Mack
Sylvia Baggett
Ken Sembach
Next TIPS Meeting: TBD
HST Focus Status
September 2002
Last mirror move was mid-2000.
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.
Focus History
focus in microns @ secondary
(no breathing correction applied)
Focus Measurements Since Last Mirror Move (2000.197)
(no breathing correction)
8
7
6
5
4
3
2
1
0
-1
-2
-3
-4
-5
-6
-7
-8
-9
-10
-11
-12
WFPC2 8829 Focus
WFPC2 9258 Focus
WFPC2 9574 Focus
WFPC2 8950 Focus
WFPC2 9663 Focus
625
600
575
550
525
500
475
450
425
400
375
350
325
300
275
250
225
200
175
150
125
100
75
50
25
0
-25
-50
-75
-100
-125
-150
-175
-200
DOY 2001
Focus Since Last Move
45
40
30
25
20
15
10
5
Focus (microns)
6
4
2
0
-2
-4
-6
-8
0
0
-1
Frequency
35
Focus (last 6 months)
25
15
10
5
Focus (microns)
6
4
2
0
-2
-4
-6
-8
0
-1
0
Frequency
20
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)
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
HRC F220W Predicted EE’s
0.8
0.6
0.4
0.2
0.0
0.00
0m
?
-2 m
?
-5 m
?
0.05
0.10
Arcsec
0.15
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)
TIPS Meeting
SPACE TELESCOPE SCIENCE INSTITUTE
1
19 September 2002
Jennifer Mack
Hot Pixel Annealing: HRC
Riess, Mutchler,Vanorsow, and Cox
2500
~80% of
Hot Pixels
Annealed
Hot Pixels with e/s > 0.08
2000
1500
1000
500
0
0
30
60
90
Days since March 30th
120
150
TIPS Meeting
SPACE TELESCOPE SCIENCE INSTITUTE
2
19 September 2002
Jennifer Mack
Hot Pixel Annealing: WFC
Riess, Mutchler,Van Orsow, and Cox
~60% of
Hot Pixels
Annealed
Hot Pixels with e/s > 0.04
• ~1000 hotpix per day
• 400 not annealed
• In 1 year, 1% of pixels will
be hot ( like #CRs in 500 s)
80000
60000
40000
20000
• Need ASCS!! (order of
magnitude lower dark rate)
0
0
30
60
90
Days since March 30th
120
150
TIPS Meeting
SPACE TELESCOPE SCIENCE INSTITUTE
Coronagraph -
19 September 2002
Jennifer Mack
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
3
TIPS Meeting
SPACE TELESCOPE SCIENCE INSTITUTE
4
19 September 2002
Jennifer Mack
WFC
Updated ACS Sensitivity
11% > at 7000A
De Marchi, Pavlovsky,
Bohlin, and Gilliland
HRC
9% > at 6000A
SBC
19% > at 1250A
TIPS Meeting
SPACE TELESCOPE SCIENCE INSTITUTE
Flat Fielding:
•
•
•
•
•
•
19 September 2002
Jennifer Mack
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
5
TIPS Meeting
SPACE TELESCOPE SCIENCE INSTITUTE
Color-Magnitude Diagrams for 47 Tucanae:
ACS
WFPC2
Mack et al,
ISR 02-08
B~60 sec
V~60 sec
I ~60 sec
Zoccali et al 2001
B~14,000 sec
V~16,000 sec
I ~22,000 sec
19 September 2002
Jennifer Mack
6
TIPS Meeting
SPACE TELESCOPE SCIENCE INSTITUTE
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
19 September 2002
Jennifer Mack
7
TIPS – WFC3 Status
Sept 19, 2002
-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
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 http://www.stsci.edu/instruments/wfc3/wfc3-docs.html)
• 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
Data Processing Pipeline
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
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
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
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 held @ Ball on Aug 3.
Most recent Interface Meeting @ 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
Front End System Schedule
Phase 1 (7/1/00 – 12/31/00)
1. Macro Definitions Π
2. Reconfigurations 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 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 D2 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 6 (1/1/03 – 6/30/03)
18. SMOV Special Commanding, Part 2
19. 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
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
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
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
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
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
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
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
SPACE
TELESCOPE
SCIENCE
INSTITUTE
Operated for NASA by AURA
TIPS / COS
19 September 2002
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
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 N2 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
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 D2 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 N2 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
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
COS Phase Development Plan
(Rev 6, 10/26/01)
Phase 1 (1/1/00 – 6/30/00)
O Macro Development
O Reconfigurations
Phase 2 (7/1/00 – 12/31/00)
O NUV Timetag Mode + Darks
O FUV Timetag Mode + Darks
Phase 3 (1/1/01 – 6/30/01)
O FUV & NUV Accumulation Science Exposures
O FUV & NUV Target Acquisition Exposures
O FUV & NUV Target Peakup Exposures
Phase 4 (7/1/01 – 12/31/01)
O Aperture Alignment Exposures
O OSM1 Focus Alignment Exposures
O OSM1 Rotation Alignment Exposures
O OSM2 Rotation Alignment Exposures
O FUV & NUV FP Split Exposures
Phase 5 (1/1/02 – 6/30/02)
O FUV & NUV GO Wavelength Calibration Exposures
O FUV & NUV Flat Field Lamp Calibration Exposures
O FUV & NUV Automatic Wavelength Calibration
Exposures
O SAA Contours
Phase 6 (7/1/02 – 12/31/02)
O SMGT Preparations
O SMOV Special Commanding
O FUV & NUV Anomalous Recovery
O FUV & NUV Initial Turn-on
O FUV & NUV BOP Target Screening
Phase 7 (1/1/03 – 6/30/03)
O FUV & NUV Lifetime Adjustments
O Coordinated Parallels
Sembach - 19 September 2002
Slide 6 of 8
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
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
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
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 1st.
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