SMOV Status & Planning Meeting Notes
6/06/09
Notes provided by Burley (richard.j.burley@nasa.gov), Biagetti (biagetti@stsci.edu, and others as
indicated.
-
Summary
Spacecraft subsystems continue to operate nominally. COS NUV detector
functional test is all nominal and the FUV ramp-up to partial high voltage is also nominal. The
third FGS AMA Adjustment is proposed for Sunday evening. The Project has decided to
stand down from all ACS WFC operations in the upcoming week while a tiger team
investigates the bias voltage anomaly reported yesterday. STIS reports good results from the
external focus check. An ops briefing held yesterday resulted in approval for the plans to
proceed with WFC3 cooldown next week.
- Observatory Status
o
o
o
o
o
-
PCS/SAC
 Nominal
EPS
 Nominal
TCS (JAbel)
 HSTAR 11868 EFG2_12T slightly over 12C limit.
 STIS MEB1 Review Status; Investigation underway.
 No short term concerns.
I&C

Nominal
DMS

Nominal
o
486FSW
 Nominal
o
SAFING
 Nominal
o
SIC&DH & P/L FSW
 Status: Nominal
SI Status
o
WFC3
 WFC3; Protect Operate, waiting for BEA end.
 Engineering
 Hickey briefing yesterday at 11:00, all parties agreed to proceed as
planned with the WFC3 activation/cooldown activities.

Science
 Nothing to add
o
COS

Engineering. SSwain.
 HSTAR 11866 COS DIB time code update not performed after
selftest.
o This explains the COS time-code anomaly addressed
yesterday (See Meeting notes of 05Jun-09)
o OR 18496 COS Time Code update – tested in ESTIF.
 Expected to be carried out sometime today.


Science. TKeyes/DSahnow.
 NUV Detector Functional Test ran last evening and analyzed during
the night (Osteman, Penton)
 David Sahnow reviewed the Functional Test results, the HV Rampup, Visit 2, and SAS operating characteristics
o All nominal
o See attached COS_SMOV_update_06June2009

o
Flash Report (from last evening)
o The FUV HV was ramped to HVlow (-4069 volts) on both
segment A and B @156 16:55 today [Friday, 5 June], the
DCE memory was dumped and analysis is pending. All
voltages, currents and temperatures were as expected.
Voltage and current monitors were similar to those observed
during the 2006 TV.
o The FUV detector is scheduled to be ramped to an
intermediate HVNom state tomorrow @157 20:54, it will be
ramped to -4916V/-4869V on segment A and B respectively.
Ops request 18495-0 has been written to clear COS event
flag 3 to allow tomorrow’s FUV HV commanding to proceed
as planned. jBacinski.
Upcoming Activities
o Proposal 11356 visit 4 of 13 (COS23) FUV HV Turn-on
 Tonight (158/0107 UT)
 SI SE to send email/flash report summarizing results
 In lieu of a meeting report in the morning,
assuming good results
 COS FUV High-Voltage Transients
FGS/OTA
 All hardware nominal
 1 HSTAR submitted #11867, AMA TRANS mode GSACQ(1,3,3)
 resulted in FL Back-up on FGS 3, due to a Walkdown failure
 11 successful Acquisitions, with 9 TRANS Mode observations.
 There was another Acquisition with the FGS 3 problem Guide Star:157:03:55
o FL with no problem
 There was an ITS observation following the AMA move.
 Third AMA Adjustment (proposed)
 Goodrich reports that FGS2R2 can be used as a guider now
o But could be improved to correct for current decenter
 3rd AMA adjustment is scheduled for late Sunday, 7 June (158)
o Recommended move is only X +0.1, Y +0.1




o No need to do it now, but it is desirable
Ed Nelan recommends doing so, providing better starting point for
re-calibration year from now.
Wenz concurs.
Whipple, Doxsey, Kalinowski concur.
For more details, see the attached AMAMove-3-SMOV-v4
Goodrich from Linda Abamowicz-reed


Desorption can cause up to 0.3 mm motion.
o But not expected to change field dependence
Up-coming 24 hours: 6 GSACQs, 3 of which will have the FGS 3 problem star, which
is not turning out to be much of a problem.
o
ACS

Engineering
 The WFC Vod anomaly
o Reported in yesterday’s notes and attachments
 “Hypersensitivity” of Quadrant to C a small change in
Vod (bias applied to CCD reset drain).
o Investigation in progress.
 Default value appears to give good performance
o Project has decided to stand down on ACS-R SMOV
activities in the upcoming week (SMS159)
 Tiger Team (headed by AWhipple) to examine the
data and help understand the cause of the Vod
behavior
 start Monday morning
 From Keith Kalinowski; The default for next week will
be redelivery of the SMS159 sometime today
(Saturday)
 Will contain no WFC commanding
o Iteration 3 of OC has been pulled
o SBC exposures will remain
 Linda Smith explained the need for the CTE and
Cross Talk observations
 They help determine the choice between
Dual-Slope integration and Clamp-andSample read-out modes.
 Ideally should occur before the WFC
Functional test, which occurs early in
SMS166.
 From ECheng 5jun09 email: I think this is a very
prudent step to take given that 1) we don't expect
that Vod can cause the observed behavior, 2) we
can replicate the behavior on the ground, but by
varying voltages other than Vod, and 3) even for the
condition in (2), we expect the effect to affect the
entire CCD, but we only observe the effect on one
quadrant on orbit
o ACS SMOV activities in the following week (SMS166,
starting June 15)
 May or may not change depending on Tiger Team
recommendations

o
Science. LSmith
 Linda reported on the results of the 2nd SBC UV Check (End_BEA
Check)
o All nominal.
o Requirements for ending the BEA on schedule have been
met.
o See attached
STIS

o
-
Science. Charles Proffitt
 OR 18468-0 Clear STIS EFlag 2 (MAMA1 Checkout 4).
 2nd stage of FUV MAM ramp, & fold test at -1950V (normal is -2250).
o Change in fold distribution meets qualitative prediction.
o Dark rates at -1950 case saw ~5.1 c/s global rate
o No obvious clumping or hot spots.
o Flat isn’t really flat
 but we have no ground test data at this voltage.
o No evidence of excessive count rates from cesium or any
danger going to full voltage.
o Recommendation to proceed to next visit.
 Alignment looks good also.
o No need for contingency alignment proposal
o Preliminary analysis of STIS focus data
 Focus from O II images give -7 to -9 microns over an
orbit
 consistent with measured STIS/OII-to-PC
focus offset and expected current OTA
focus.
 Small aperture throughput images
consistent with historical values.
 For more details, see attached
smov_stis_science_06june2009.
 Continuing to investigate the apparent higher than expected CTE
losses.
NICMOS/NCS
 Status: No change
P&S Status
o
Calendar/SMS builds
 SMS159
 Rework underway to remove ACS OC Iterations 3 & 4
o Also removing
 External CTE Mon (11510)
 CCD Cross Talk Activity (11371)
 Could possibly be reinserted via intercept SMS
 Pending Tiger Team recommendations
o SBC activities remain in the SMS

SMS166
 In work
 Retains the WFC SMOV activities following curtailed OC
o TBR pending Tiger Team recommendations
-
Operations
o
FOT


HSTAR 11865 MSID Engineering Telemetry data > STScI receiving different
then expected MSID.
Freeze Forms to be Reviewed.
o
PACOR (BPatel)
 From June 5 (8am) to June 6 (8am), Pacor-A received three events with
fast-track observations. The data was processed and delivered to OPUS
without any problems.
o
OPUS
 Fast-tracked data for COS proposals 11356 and 11467, and STIS proposal
11350. More data for proposal 11356 is coming late tonight.
 Lisa Sherbert (OPUS developer) looked into the problem with population of
OPUS database records for next week’s observations, which appears to be
due to an invalid combination of member types specified in association for
exposures in some ACS associations. Lisa informed Mike Boyer (SPSS
developer) of this, and last we heard he was still looking into the COS
tag/flash related problem. The OPUS database tables need to be properly
populated before we can process data from next week's SMS.
 Followup, no splinter meeting today. CLong indicates that they
understand the problem, that it is not urgent, and that we can
speak on Monday.
 Al Holm noticed that a time stamp in qo_cos_tag_flash, manually populated
by SMSB for a tag-flash exposure that executed last night (proposal 11467),
has a time stamp with the year 1009 instead of 2009. The data processed
without errors, but the incorrect year may show up in the science headers
and require reprocessing.
o
Archive
 Nominal