TIPS/JIM
July 16, 2009
Agenda:
ACS Status (David Golimowski)
COS Status (Tony Keyes)
STIS Status (Charles Proffitt)
WFC3 Status (John MacKenty)
HST Focus and Pointing (Matt Lallo)
NICMOS Update (Anton Koekemoer)
Next TIPS/JIM: August 20, 2009
SMOV4 Update: ACS Status
David Golimowski (TIPS/JIM 16 Jul 2009)
Outline
•
Summaries of Functional Test and Optimization Campaign
•
WFC and SBC Performance and Characteristics
•
Implications of SI C&DH Anomaly (HSTAR 11880)
•
Assessment of Day 174 Suspend (HSTAR 11895)
•
SMOV Status and Forward Plan
TIPS/JIM 16 Jul 2009
1
ACS-R Functional Test and
Optimization Campaign - 1
•
ACS-R hardware successfully installed on 16 May 2009 during EVA-3
•
WFC and SBC passed Aliveness and Functional Tests; HRC not recovered
•
Day 146 (26 May): WFC 12-hour anneal performed; pre- and post-anneal dark
frames show little change indicating that 18 month hiatus at ambient -10° C was
sufficient to anneal nearly all temporary hot pixels.
•
Day 148 (28 May): WFC Optimization Campaign commenced
•
Day 150 (30 May): SBC UV contamination check; BEA exit deemed safe
•
Optimization Campaign contained general WFC Performance Summary and
multiple exploratory tests involving changes in bias and clock voltages and data
transmission timing. Tests showed that all pre-failure settings remained valid for
CEB-R operations and that no changes in default settings were warranted.
TIPS/JIM 16 Jul 2009
2
WFC Bias and Dark Frames
Superbias from Prop 11369
(SMOV CCD Functional Test)
TIPS/JIM 16 Jul 2009
Superdark from Prop 11369
(SMOV CCD Functional Test)
3
WFC Linearity and Full Well
Photon Transfer Test from Iteration 1 of O.C.
(Amplifier D, Dual-Slope Integrator)
TIPS/JIM 16 Jul 2009
4
WFC Performance Summary
January 2007
(measured)
May 2009*
(projected)
Problematic*
Read noise
(e-; gain = 2)
C&S: 5.5
DSI: 4.0
10
DSI: 3.9-4.7
C&S: 4.4-5.7
Dark current (e-/pix/hr)
10.7
15
100
20-25
Hot pixels (%)
0.68
1.1
1.5
1.1
Full well depth (e-)
84,000
84,000
40,000
~80,000
Non-linearity (%)
< 0.1
< 0.1
0.5
< 0.2
Metric
Post SM4
(measured)
(exp time > 2 s)
CTE (1620 e-)
0.999949
0.999921
0.9999
0.99989
Cross-talk
4x10-5
4x10-5
4x10-4
1x10-4
Bias shift** (%)
0.02
< 0.1
< 0.2
0.02-0.30
(before correction)
* Projected and problematic values from Gilliland et al. 2008 (TIR ACS 2008-04) .
**Residual bias shift after analytical correction of signal-dependent effect.
TIPS/JIM 16 Jul 2009
5
ACS-R Functional Test and
Optimization Campaign - 2
•
Optimization Campaign truncated on 3 June 2009 after Iteration 2
 Performance matched or exceeded projections and expectations
 VOD offsets of < -1 V produce anomalous behavior in amps C and D that
mimic charge-injection but remain unexplained by Tiger Team
 HSTMO and Project elect to proceed with WFC default configuration
and continue “off-line” investigation of VOD anomaly
•
Dual-Slope Integrator selected as default mode of ASIC pixel sampling
•
Low-frequency bias variations and signal dependent “bias shift” can be effectively
removed during post-image processing
•
Bias striping pattern varies among quadrants and between frames; caused by 1/f
noise (1 mHz to 1 Hz) generated with ASIC during setting of bias voltage offset.
Striping appears constant across rows of CCD, so may be removable.
TIPS/JIM 16 Jul 2009
6
VOD (Reset Drain) Anomaly
VDD: +27V, VLG: -3V
(defaults)
Bias
VOD: +14V
(default is +15V)
Illumination 1
Illumination 2
TIPS/JIM 16 Jul 2009
7
SBC UV Contamination
F125LP
Bright Earth photopolymerizes
contaminants onto pickoff mirror
Pre SM4 (short)
Post SM4 (short & long)
F150LP
Delta Mag (Pre-Post SM4)
F115LP =
F125LP =
F140LP =
F150LP =
F165LP =
-0.034 +/- 0.017
-0.014 +/- 0.013
-0.019 +/- 0.015
0.002 +/- 0.015
0.008 +/- 0.015
TIPS/JIM 16 Jul 2009
8
SIC&DH Anomaly (HSTAR 11880)
•
HST safed on Day 166 (15 June) after failure of SIC&DH toggle test; all SI
commanding lost; SIs remain in state at time of SIC&DH failure; SMS
continues to execute; HST continues to slew
•
Tiger Teams assembled to investigate:
 Dangers to SI detectors (MAMA, CCD, IR) due to overexposure during
Bright Earth crossings, SAA crossings, and slews across bright stars
 Potential polymerization of contaminants on optics in UV channels
•
Implications for ACS:
 No danger to CCDs; WFC science can continue unimpeded
 SBC MAMA vulnerable to catastrophic damage during BE crossings
 Impact of SAA on MAMA unknown because HV normally turned off
 ACS optics exposed to 100s of hrs of BE crossings with no ill-effects
•
SBC concerns resolved by 486 FSW revision that automatically shuts down
MAMA HV after future (expected) SIC&DH anomalies
TIPS/JIM 16 Jul 2009
9
Day 174 Suspend
(HSTAR 11895)
•
ACS suspended on 23 June as result of 2 Error Status Buffer messages:
 ACS 955: CEB Command Max Retries Exceeded
 ACS 1002: NED ASIC Not Alive
•
Status at time of suspend:
 No observations executing or lost
 All monitored currents and voltages normal
 ASIC & FPGA properly initialized & functioning after SMS 173 reboot
 Error occurred during NED collection cycle (CS to ASIC comm broken)
 HST orbital position far from SAA
•
Tiger Team formed on 24 June and identified 2 possible causes:
 ASIC Status Line raised (informs FPGA of bit anomaly or comm error)
 FPGA reset in response to SEU of power regulator
TIPS/JIM 16 Jul 2009
10
FPGA/ASIC Relationship
TIPS/JIM 16 Jul 2009
11
Possible Causes of
Day 174 Suspend
•
ASIC Status Line scenario not favored because it produces only ACS 955
ESB message and does not explain “ASIC Not Alive” failure
•
Radiation test reports now available show ambient heavy-ion flux sufficient
to upset power regulator once every ~100 days
 SEU causes small voltage drop that triggers Power On Clear circuit
 FPGA and ASIC both reset; only FPGA reboots
 Scenario explains both ACS 955 and ACS 1002 ESB messages
•
Event will happen again, but signature of anomaly will depend on timing of
SEU with phase of FPGA/ASIC/telemetry duty cycle
•
Tiger Team investigating FSW changes to inhibit suspend action in this
particular instance of ACS 955 error message
TIPS/JIM 16 Jul 2009
12
Status and Forward Plan
•
Both SBC and WFC have had successful and spectacular “first light”
external observations. (No pretty pictures -- sorry!)
•
WFC focus is -2.5 µm off nominal. Other SIs will be made confocal with
WFC and secondary mirror will be moved next week.
•
All SBC and WFC SMOV programs have been executed and data analysis is
underway. Several SMOV programs (all HRC; WFC half-speed; coarse &
fine corrector alignment) were unnecessary and dropped.
•
VOD anomaly and its possible beneficial use to mitigate CTE through chargeinjection will being investigated
•
Changes to FSW being considered to prevent suspend after SEU of CEB-R
(expected every 100 days)
•
ACS cleared for GO Science!!!
TIPS/JIM 16 Jul 2009
13
TIPS/JIM
July 16, 2009
Agenda:
ACS Status (David Golimowski)
COS Status (Tony Keyes)
STIS Status (Charles Proffitt)
WFC3 Status (John MacKenty)
HST Focus and Pointing (Matt Lallo)
NICMOS Update (Anton Koekemoer)
Next TIPS/JIM: August 20, 2009
TIPS
COS Status: post-servicing
--- Tony Keyes --16 July 2009
COS and NCS Pressure
5E-06
!COS (LVACPRES)
!NCS (METPSPR)
Pressure (Torr)
4E-06
SIC&DH Anomaly
3E-06
FUV HV Turn-on
Complete
2E-06
1E-06
0E+00
5/22
5/26
5/30
6/3
6/7
6/11
6/15
6/19
2009 (UT)
6/23
6/27
7/1
7/5
7/9
7/13
COS NUV Temperature
30
NUV resume
NUV ops /
FUV turn-on
NUV initial
turn-on
25
FUV only
Temperature (C)
20
15
COS suspend
10
5
!Charge Amps (LMCHAMPT)
!MCE (LMMCETMP)
!Electronics Box (LNELBOXT)
!MAMA Tube (LNTUBET)
!Front Bulkhead (LNUVFBT)
SIC&DH Anomaly
0
-5
-10
5/22
5/26
5/30
6/3
6/7
6/11
6/15
6/19
2009 (UT)
6/23
6/27
7/1
7/5
7/9
7/13
COS MAMA Event Counter (LMEVENTS)
400
350
Events (counts)
300
250
200
150
100
50
0
5/22
5/26
5/30
6/3
6/7
6/11
6/15
6/19
2009 (UT)
6/23
6/27
7/1
7/5
7/9
7/13
COS Highlights
 NUV / FUV HV Turn-on complete
 NUV/FUV Functional Tests complete
–
–
Darks: NUV ~70 counts/sec (10x less than STIS/NUV);
FUV ~1 count/resel/3-hours
OSM drift: few measures to date, but definitely present;
TAGFLASH can remove
 COS-to-FGS Alignment established
 COS NUV (imaging) “first light” on 11 June
–
–
F2V astrometric target in NGC-188
Counts ~30% higher than predicted
>
>
within errors on model simulation
NUV sensitivity quicklook observations upcoming
COS Highlights (continued)
 COS NUV Optical Alignment established
–
Final verification visits in progress
 COS NUV (spectroscopy) “first light” on 14 July
–
FUV Sensitivity Quicklook
>
>
Range: TV03 estimates +20% / -10% (nominal)
Some system throughput to ~1000 Angstroms
COS Upcoming Events
 FUV Optical Alignment (COS26 - 11484)
–
Mon-Sun 20-26 July:
 NUV Sensitivity Quicklook (COS34 -11479)
–
Tues 21 June
 NUV Internal Flat Fields (COS 22 - 11478)
–
First 18 (of 72) : Tues-Fri 21-25 July
 NUV Internal/External Wavecal (COS14 – 11474)
Fri/Sat 24-25 July
 NUV Focus and Alignment Verification (COS18 – 11469)
–
–
Completes 20 July
COS SMOV4 NUV Sequence
HST release
COS-01
Recovery from
SAFE
COS-06 11467
NUV Internal
Functionality &
Operation
Internal pressure
<20 micro-Torr
MAMA LV on
COS-02 11353
Onboard
Memory Check
COS-03 11354
Science Data
Buffer Check
COS-04 11355
NUV Initial HV
Turn-on/Ramp-up
COS-07 11355 v5
NUV
Fold Test
COS-05 11466
NUV
Dark Measure
24h
data
24h
data
SCI
REF
COS-08 11468
OTA to FGS
Alignment (NUV)
Wavelength
Ranges OK
SIAF update
available
Uplink
24h
data
Alignment
Not OK
COS-10 11496
Internal NUV
Wavelength Meas
& Grating Eff.
Vis 1, 3 – lamp 2
COS-09 11469
NUV Optical
Alignment /Focus
visit 1-6
24h
data
COS-17 11477
NUV Ext.
Spectr. Perf.
Part 2
Enable Wavecaldependent
NUV Calibration
and Science
COS-15 11475 Wavelength
Internal NUV
Ranges
Wavelength
Not OK
Verify
24h
data
REF
Require
Wavelength
Scale Update
COS-16 11476
NUV Ext.
Spectr. Perf.
Part 1
Internal pressure
<10 micro-Torr
BEA Complete
ERO
FUV SMOV
sequence
24h
data
Uplink
COS-19 11479 v2-n
NUV Spectr.
Sensitivity
REF
COS-20 11480
NUV Structural
& Thermal
Stability
COS-21 11481
NUV High S/N
Verification
REF
COS-14 11474
NUV Int/External
Wavelength Scales
Uplink
IHB
24h
data
COS-09 11469
NUV Optical
Alignment vis 7-12
External
Observations
24h
data
COS-19 11479 v1
NUV Spectr.
Sensitivity Quick
Uplink
24h
data
COS-10 11470
Internal NUV
Wavelength
Meas
May require wait
9 April 2009
SIAF update
start
Alignment OK
Uplink
Uplink
COS-11 11471
NUV Imaging
Acq Verify
REF
COS-12 11472
NUV Dispersed
Acq Verify
Uplink
REF
COS-18 11478
NUV
Flat Fields
COS-13 11473
NUV Imaging
Performance
Do NOT
Require
Wavelength
Scale Update
COS SMOV4 FUV Sequence
Outgassing
Concern?
XDL at OPER
Internal
Pressure
COS-01
HST COS-02 11353
release COS-03 11354
<100 microTorr
NUV SMOV
sequence
COS-08 11468
NUV Optical
Alignment /Focus
Uplink
SIAF update
start
May require wait
COS-31 11489
FUV Ext.
Spectr. Perf.
Part 1
Wavelength
Ranges OK
REF
COS-27 11496
Internal FUV
Wavelength Meas
Vis 2 – lamp 2
SIAF update
available
COS-30 11488 Wavelength
Ranges
Internal NUV
Not OK
Wavelength
Verify
24h
data
Uplink
Uplink
24h
data
COS-26 11484
FUV Optical
Alignment /Focus
visit 1-4
COS-27 11485
Internal FUV
Wavelength
Meas – Vis 1
COS-26 11484
FUV Optical
Alignment /Focus
Verif. – visit 5-6
Alignment OK
COS-36 11494
FUV High S/N
Verification
Require
Wavelength
Scale Update
24h
data
COS-28 11486
FUV Dispersed
Acq Verify
Does NOT Require
Wavelength Scale
Update
Enable
FUV ERO
No
wavecal
COS-32 11490
FUV Ext.
Spectr. Perf.
Part 2
Enable Wavecaldependent
FUV Calibration
and Science
REF
COS-29 11487
FUV Int/External
Wavelength Scales
24h
data
Uplink
External
Observations
COS-23 11356
FUV Initial HV
Turn-on/Ramp-up
Pressure Gauge OFF
COS-25 11483
FUV Internal
Functionality &
Operation
COS-34 11492 v1
FUV Spectr.
Sensitivity - Quick
24h
data
Internal
Pressure
<10 microTorr
BEA Complete
uplink
24h
data
COS-09 11469
NUV Optical
Alignment /Focus
COS-22
FUV Detector
Door Open
COS-24 11482
FUV
Dark Measure
24h
data
24h
data
COS-33 11491
FUV
Flat Fields
REF
COS-34 11492 v2-4
FUV Spectr.
Sensitivity
REF
COS-35 11493
FUV Structural
& Thermal
Stability
24h
data
Rapid data turnaround required
ERO
Required to enable ERO
SCI
Required to enable science
REF
Analysis produces reference file
IHB
Results reported in IHB
9 April 2009
COS SMOV Timeline
•
•
•
•
•
•
May 11: SM4 Launch
May 16: COS installation (EVA3)
May 22 – Jul 27: Beginning COS SMOV engineering and alignment activities
–
–
–
Engineering Check-out and Detector Turn-on (NUV: May 23 – June 4, FUV: June 5-15)
Fast turnaround of turn-on visits
Initial Detector verifications (NUV: June 4-8, FUV: June 16-20)
Optical Alignments (June 11- Jul 27) Fast turnaround of each visit
–
–
–
–
–
–
–
–
TA Verification (FUV: Aug 10, NUV: Aug 22-27)
Imaging Verification (Aug 10)
Wavelength Calibration (FUV: Jul 27 - Aug 9, NUV: Jul 22 – Aug 6)
Flux Calibration (FUV: Aug 10-13, NUV: Aug 18-20
Internal and External Flat Fields (NUV: Jul 22 - Aug 16, FUV: Aug 24-25)
High S/N Verification (FUV: Aug 30-31, NUV: Aug 28-29)
Spectroscopic Performance (FUV: Aug 16-25, NUV: Aug 17-29)
Thermal Stability (FUV: Sep 15, NUV: Aug 30 – Sep 5)
~Aug 30: COS science observations enabled
Aug 3-9: COS EROs enabled
Jul 22 – Sep 15: General Science Calibration Verification
TIPS/JIM
July 16, 2009
Agenda:
ACS Status (David Golimowski)
COS Status (Tony Keyes)
STIS Status (Charles Proffitt)
WFC3 Status (John MacKenty)
HST Focus and Pointing (Matt Lallo)
NICMOS Update (Anton Koekemoer)
Next TIPS/JIM: August 20, 2009
STIS Status
TIPS
July 16, 2009
STIS Status
• STIS MIE anomaly
– What is known
• STIS CCD status before the anomaly
• STIS MAMA SMOV status
STIS MIE Anomaly
•
•
STIS currently suspended
Original suspend (day 187) : Main STIS CS computer unable to get
timecode update from MIE (MAMA Interface Electronics) that was
needed to populate the header of a CCD exposure.
– Originally suspected that single event upset had hung up the MIE 486.
•
2nd suspend (day 190): Suspended while attempting to copy MIE
memory to CS. Done before full reset in attempt to preserve MIE
memory
– Theorized that problem with MIE dump was caused by lack of full reset, and
hoped a full reset would clear the problem.
– About 1/2 of MIE memory was successfully copied.
•
3rd suspend (191): Did full reset and successfully recovered STIS to
operate, but suspended while attempting to copy MIE memory to CS.
– MIE copy to CS seems to have succeeded, but still suspended
– Recovery included successful queries of MIE for time code update (I.e., the
original problem from day 187 did not recur).
– Observed events suggest transient failure on MIE FIFO Flags interface
between CS and MIE?
STIS MIE Anomaly - cont
•
What we know:
•
•
The three anomalies occurred during three different circumstances and
have three different and - in some aspects - inconsistent signatures
Observed events suggest transient failure on MIE FIFO Flags interface
between CS and MIE
•
Investigation is continuing
•
Perhaps MIE dump problem is separate from original time code
update problem?
•
STIS still suspended
•
Hope to allow resumption of CCD operations soon, while analysis
continues.
•
•
•
See if original anomaly reoccurs.
CCD observations could, in principle work around MIE problems
Since anomalies are not yet understood, implications for MAMA
observations are not yet known
STIS CCD Read Noise
•
•
STIS CCD read noise slightly increased from ~ 5.4 e- in 2004 to ~ 5.7 e- now
Side 2 read-noise includes ~ 1 DN of semi-coherent 17 kHz pattern noise
–
This pattern noise appears to be unchanged after SM4
STIS CCD Dark Current
•
•
•
•
CCD housing temperature (OCCDHT) surrogate for CCD chip T
For comparison these plots scale darks to housing temperature of 18 C
Dark rate increases by 7%/degree of housing temperature
2009 aft-shroud hotter than 2004
–
–
•
When MAMAs on, OCCDHT 22-25 C
With MAMAs off, OCCDHT 16-18 C
RN between 0.009 and 0.013 e-/s, fluctuating with temperature
TDS & CTE effects
•
•
Standard monitor target AGK+81o266 (*’s) shows large scatter
at low flux levels (right panel), even in 2004 - correlates with T
Need to separate T dependence of CTE before deriving final
throughput estimates
• CTE extrapolated to zero background as a
function of flux level
• 2009 points are at colder T than older data
– Expect reduced CTE losses at lower T
MAMA SMOV Status
•
FUV MAMA
– FUV MAMA HV ramped to full values
– Fold test & flat look as expected
– Dark current perhaps lower than expected
•
NUV MAMA
– Initial steps of NUV MAMA HV recovery completed
– Have not yet ramped NUV HV to level where tube generates real
counts.
•
•
Still need to do initial internal lamp exposures and external
exposures with both MAMAs
Once MAMAs cleared for operations, most SMOV activities for
either or both could be completed in a week if time available.
TIPS/JIM
July 16, 2009
Agenda:
ACS Status (David Golimowski)
COS Status (Tony Keyes)
STIS Status (Charles Proffitt)
WFC3 Status (John MacKenty)
HST Focus and Pointing (Matt Lallo)
NICMOS Update (Anton Koekemoer)
Next TIPS/JIM: August 20, 2009
WFC3 SMOV Report for TIPS
16 July 2009
John MacKenty
This presentation contains material that is embargoed until after the SM4
ERO press conference. Images/spectra of external (astronomical) objects
may not be altered, distributed, reproduced, published, displayed, or used in
any other way without the consent of the STScI Director or the HST Project.
WFC3 Activities
•
11451 IR Zero Points – P330E and GD153 standard stars (Visits 11,21)
– Series of short exposures of
• White Dwarf standard star GD153 (hot source)
• Solar analog P330E (cool source)
• Both about V = 13.0
– All IR Filters exposed in RAPID plus narrow filters in SPARS10
– IRSUB128 used
• Target was close (2.5”) to corner but OK
– Two sets of exposures obtained
•
•
– Preliminary conclusion: IR photometry is 10-15% better than expected
11452 UVIS Flat Field Uniformity – very nice dataset on Omega Cen
11427 UVIS Shutter Test – data being analyzed
PRELIMINARY IR Throughput
WFC3 SMOV Progress
•
•
WFC3 has 43 distinct SMOV Activities following SM4
Three phases:
– Engineering
• Complete except for TEC setpoint verification ongoing
• Instrument performance nominal
– Optical Alignment
• Both channel alignment/focus activities complete
• Verification follows OTA move on Day 201
– Science performance and calibration verification
• This week completing items for ERO and “EASY” science enable
• Most WFC3 ERO’s on 201 and 208 SMSs (208 also first science!)
• Except to complete SMOV in mid-late August
Engineering Tests
•
•
•
•
•
•
•
•
•
Activation – repeat of FT and TEC cooldowns (11 June)
Memory and Science Data Buffer Tests
UVIS and IR Detector Functional Tests
– Demonstrated expected readnoise and gain in both channels
Channel Select Mechanism Test (aka First Light)
– Beam is clear of obstructions and CSM repositions correctly
UVIS SOFA and IR FSM tests
– SOFA has shown 1 step offset in Wheel 10 – minor issue
UVIS and IR Tungsten primary and spare lamp tests
UVIS Contamination monitor
UVIS Anneal
UVIS and IR TEC performance
– Still working thermal models to verify WFC3 can hold detector
operating temperatures throughout Cycle 17: TECFIRE DB is close
Optical Alignment
•
•
•
•
•
•
UVIS
– Initial and Fine Alignment activities completed
– Four iterations of focus and tip/tilt adjustment
– Lost (and repeated) on visit due to Guide Stars
– UVIS focus mechanism shows some “wobble”
– Final tip/tilt run has best image (minimize coma) in corner of box
IR
– Initial and Fine Alignment activities completed ( 5 iterations)
– Best image quality and EE achieved
WFC3 chief ray angle was off by about 1 arc min (expected 10-15”)
Both focus mechanisms near center of range
Intentional defocus of 2.5 microns to be confocal with ACS/WFC
– Move to nominal focus on Day 201 with OTA move of 3 microns
Detailed image characterization (EE and PSF Wings) on 208 SMS
UVIS Science Performance and
Calibration Verification
•
•
•
•
•
•
•
•
Bias, Darks, CTE – nominal, early results show ACS trend of CTE
Hot pixel trending unclear – first anneal proceeded by SI C&DH
INT flats looking good – droplets unchanged since TV3
FGS SIAF update in work
SAA passage test OK
“bowtie” (i.e. QEH mitigation working well <0.5% residual)
Upcoming events:
– plate scale, L-flat verification
– shutter timing and jitter tests
– Pointing stability and D2 lamp tests
Throughput results look good
PRELIMINARY UVIS Throughput
IR Science Performance and
Calibration Verification
•
•
•
•
•
Darks
– Discovered light leak when HST pointed at bright earth
– Likely fix is to position CSM in UVIS position (being tested)
– Base dark is very good
FGS SIAF update in work
SAA passage test OK
Upcoming events:
– plate scale, L-flat verification
– Pointing stability
– Grism verification
Throughput results look good
IR Dark as function of pointing
PRELIMINARY IR Throughput
TIPS/JIM
July 16, 2009
Agenda:
ACS Status (David Golimowski)
COS Status (Tony Keyes)
STIS Status (Charles Proffitt)
WFC3 Status (John MacKenty)
HST Focus and Pointing (Matt Lallo)
NICMOS Update (Anton Koekemoer)
Next TIPS/JIM: August 20, 2009
TIPS/JIM
16 July 2009
Status of focus and pointing during SMOV4
M. Lallo for TEL
TIPS/JIM
16 July 2009
SMOV Focus & Plan
1.) Focus of ACS/WF channel determined by TEL Group indicates a defocus
equivalent to –2.5 microns of HST Secondary Mirror despace. (Coarser SBC
measurements consistent with this).
2.) WFC3 & COS focus and optical alignment activities carried out by Hartig. During
this process, they were offset last week by the equivalent of this –2.5 micron
amount. This move has left the two new SIs slightly off their best focus but achieves
practical confocality with ACS.
3.) A movement of the HST Secondary Mirror of +2.5+0.5 = 3.0 microns will occur
this Monday (July 20th) and should leave the three SIsʼ focii ~ +0.5 micron.
• Restoration of optimal focus for WFC3 will precede WFC3 PSF specification tests, Early
Release Science, and Cycle 17.
• WFC3 wishes to maintain focus comfortably within 2 microns
• Leaving the OTA focus at +0.5 microns should result in passing through best focus (0) in
cycle 17, and not reaching –2 microns until mid-2012
• STIS slit focus should remain within typical ranges seen in the past since STIS was
originally optimized with OTA at comparable focus values.
TIPS/JIM
16 July 2009
Long-Term Trend of the HST OTA
·Phase retrieval focus results from WF/PC,
WFPC2/PC, & ACS/HRC images since HST
launch culled together, averaged per visit and
put onto same frame (WFPC2/PC focus)
·Secondary mirror moves have been removed
to present continuous curve.
·Curve shown is a fit double exponential:
-5.04 + 56.26e–t/364.53 + 106.24e–t/2237.2
·RMS residuals 2.7 microns
·Asymptote of -5 mic
TIPS/JIM
16 July 2009
SMOV Pointing & Plan
1.) FGS2: has been aligned (for now) with solution good to ~ 90 mas 1 sigma.
• Alignment found ~9” from pre-flight operational values. Not unexpected.
• Updates to scale have also been made.
• Higher order distortion currently assumed as ground-tested. Will be calibrated later.
• Scale and Alignment calibrations have brought the total position error from max of ~22 arcsec
to ~ 90 mas. Will change!
• FGSs 1 & 3 believed to be remained calibrated with total position errors ~50 mas.
2.) SIs: Calibrating the alignment of the SIs to the FGSs determines their location in V2,V3.
Solutions have been worked by TEL & SI teams:
• WFC3:
UVIS, Preliminary results indicate a shift of ~3”, with small orientation change (<0.1 deg
TBD). Not unexpected based on past SIsʼ gravity release, latch uncertainty, and pre-flight model
accuracy. IR, Currently being worked. Larger shift expected due to optical adjustment of channel.
Updates to Ground Systems database on Aug 3 SMS (215)
• COS: Aperture found within 1.8” of pre-flight estimate. Since then aperture has been intentionally
moves significantly as optical alignment is performed. Total shift being determined by COS team.
Values will be used to update Ground Systems database on Aug 3 SMS (215)
• ACS: ACS shift was (–0.55,–0.41) arcsec V2V3. Early 2007 checks gave (–0.32,–0.36). Ground
Systems database update planned for ~Aug 10 (SMS 222)
• STIS: position determined (+0.233, –0.062). Ground Systems database update TBD.
TIPS/JIM
July 16, 2009
Agenda:
ACS Status (David Golimowski)
COS Status (Tony Keyes)
STIS Status (Charles Proffitt)
WFC3 Status (John MacKenty)
HST Focus and Pointing (Matt Lallo)
NICMOS Update (Anton Koekemoer)
Next TIPS/JIM: August 20, 2009
TIPS
15 July 2009
NICMOS Status Update
Anton Koekemoer
NICMOS Status Update
NCS/NCC restart:

Goals:
– Avoid a condition where mostiure can migrate into the Circulator Pump and
freeze out (causing current limit violations)
– Avoid a condition where the TurboAlternator operates near its lowrr thrust
bearing speed limit for an extended period of time
– Reproduce as closely as possible the conditions of the successful March 2002
cooldown

Restart criteria: Temperatures within 275 - 278 K for > 12 hours for:
– TurboAlternator inlet
– Circulator housing
– heat rejection interface274


Temperatures of TA inlet were 274.6 K as of this morning
Aiming for a restart sometime early Friday morning
NICMOS SMOV plan remains ready to execute
NICMOS reprocessing:


All pre-NCS data reprocessed, in HLA
Next step is to continue post-NCS reprocessing
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TIPS
15 July 2009
NICMOS Status Update
Anton Koekemoer
Recent NCS restart attempts
With circulator problems:
– 2008 Sep 11: Safed on Circulator speed limit 1396 rps after approximately 6
hours of operation. Circulator Housing Temp ~ 94 K. (NCC Only)
– 2008 Sep 15: Circulator Housing Temp ~ 169 K. Safed at start-up on
Circulator current limit of 130 mA. (NCC only)
– 2008 Sep 16 (1): Circulator Current Limit raised to 150 mA. Safed at start-up
on Circulator speed limit of 1396 rps. (NCC only)
– 2008 Sep 16 (2): Circulator Upper Speed Limit was disabled. Circulator
Housing Temp ~ 187.5 K. Safed shortly after start-up (~25 minutes) on
Circulator current limit of 150 mA. (NCC only)
– 2008 Nov 19: Circulator Housing temp ~ 274 K. Safed at start-up on
Circulator current limit of 150 mA. (NCC Only):
Successful circulator restart, but TA low speed problems:
– 2008 Dec 20: Circulator Housing temp ~280 K. TA Inlet temp ~ 209K.
Safed on TA Speed low limit of 1650 rps after 65 hours of compressor
operations. (NCC Only)
– 2009 Jan 15: Circulator Current Limit raised to 200mA. Circulator Housing
Temp ~280K. Safed on TA speed low limit of 1650 rps
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TIPS
15 July 2009
NICMOS Status Update
Anton Koekemoer
Other NICMOS News



NICMOS Data Handbook V8.0 released (Thatte, Dahlen et al.)
NICMOS Instrument Handvook v11.0 released (Viana, Wiklind et al.)
Instrument Science Reports:
– NICMOS ISR 2009-001 (E. A. Barker & T. Dahlen): "New Bad Pixel Mask
Reference Files for the Post-NCS Era"
– NICMOS ISR 2009-002 (T. Dahlen et al.): "Temperature Dependent Dark
Reference Files: Linear Dark and Amplifier Glow Components"
– NICMOS ISR 2009-003 (T. Dahlen, M. Sosey & E. Bergeron): "Updates to
Calnica: Using Temperature Dependent Reference Files"
– NICMOS ISR 2009-004 (A. C. Viana, R. S. de Jong & A. M. Koekemoer):
"NICMOS Photometric Calibration Pipeline"
– NICMOS ISR 2009-005 (D. Thatte & T. Dahlen): "NICMOS Temperature
Dependent Flat-fields"
– NICMOS ISR 2009-006 (N. Pirzkal, R. Bohlin & D. Thatte): "NICMOS
Grism Wavelength Calibration"
– NICMOS ISR 2009-007 (N. Pirzkal, D. Grumm & E. Bergeron):
"CalTempFromBias:Implementation and Testing:
– NICMOS ISR 2009-008 (T. Wiklind & D. Thatte): "NICMOS Breathing and
Focus Field Variations"
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TIPS
15 July 2009
NICMOS Status Update
Anton Koekemoer
Some NICMOS Reprocessed / HLA images
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