HUBBLE SPACE TELESCOPE - Continuing to collect World Class
Science
DAILY REPORT #4858
PERIOD COVERED: 5am June 2 - 5am June 3, 2009 (DOY
153/0900z-154/0900z)
OBSERVATIONS SCHEDULED
FGS 11458
Optimizing FGS2R2 Performance with the AMA
Ths proposal satisfies SMOV4 AD OTA/FGSS-054. S-curves
with PUPIL and
F583W will be obtained at selected locations within the
FGS2R2 FOV
during SMOV4. These data will be will be used to adjust
the AMA so as to
align the HST pupil onto the interferometer's Koesters
prisms. The final
AMA position will be set to produce an acceptable set of
S-curves across
the FGS2R2 FOV. The AMA will be adjusted using
CCL/instructions from the
ground. It is intended that this proposal executes during
the SMOV4 BEA
and will require several (on the order of 4) iterations to
achieve
optimal interferometric performance.
STIS17/S/C 11350
FUV MAMA HV Recovery
This proposal addresses the concerns over Cesium migration
from the
FUV-MAMA photocathode into the pores of the microchannel
plate and lays
out the procedures necessary to permit a safe and
controlled recovery of
the FUV-MAMA detector to science. This procedure should
only be used
during the SMOV4 high voltage recommissioning phase for
the FUV-MAMA.
After that, the normal ramping procedure should be used.
This proposal
is loosely based on proposal 10036, STIS MAMA Anomalous
Recovery, with
the differences summarized below: (1) additional plateaus
during voltage
commanding, (2) longer dwells after each 50 V step, (3)
intermediate
ramp re-structured into 2 parts, (4) change in yellow and
red limits and
the MCP Hi limit, setting new values for the next plateau,
and (5)
adding a fold test at 300V below the nominal MCP voltage.
The recovery
consists of four separate and unique procedures (visits)
and they must
be completed successfully and in order. They are: (1) a
signal
processing electronics check, (2) 1st high voltage ramp-up
to an
intermediate MCP voltage of -1500 V with limits
modifications and
voltage plateaus, (3) 2nd high voltage ramp-up to an
intermediate MCP
voltage of -1950 V (300 V below the nominal MCP voltage)
with limits
modifications and voltage plateaus followed by a fold distribution
test,
and (4) the final high voltage ramp-up to the full
operating voltage,
again with limits modifications and voltage plateaus,
followed by a fold
distribution test. During the 1st high voltage ramp-up,
diagnostics are
performed followed by a dark exposure. During the 2nd and
3rd high
voltage ramp-ups, diagnostics are performed followed by a
dark, flat
field ACCUMs, and a fold analysis test. All required
parameters are
defined in 07-248 FUV and NUV SMOV Ramp-up Parameters
Excel workbook.
Supports Activity STIS-17
STIS5/CC 11399
STIS CCD Hot Pixel Annealing (SMOV4 activity STIS-05)
This purpose of this activity is to repair radiation
induced hot pixel
damage to the STIS CCD by warming the CCD to the ambient
instrument
temperature and annealing radiation damaged pixels.
Radiation damage creates hot pixels in the STIS CCD
Detector. Many of
these hot pixels can be repaired by warming the CCD from
its normal
operating temperature near -83?C to the ambient instrument
temperature
(~ +5 deg C) for several hours. The number of hot pixels
repaired is a
function of annealing temperature. So although the CCD
during Safing has
been warmer (~ -5 deg C) than its normal operating
temperature, the
electronics have been off and the CCD has remained cooler
than its
temperature (+5 deg C) during the annealing procedure.
The effectiveness of the CCD hot pixel annealing process
is assessed by
measuring the dark current behavior before and after
annealing and by
searching for any window contamination effects. In
addition CTE
performance is examined by looking for traps in a low
signal level flat.
This proposal is a continuation of the Cycle 12 proposal
10022.
FLIGHT OPERATIONS SUMMARY:
Significant Spacecraft Anomalies: (The following are
preliminary reports
of potential non-nominal performance that will be
investigated.)
HSTARS:
11861 - GSAcq(1,3,3) at 153/21:42:00 results in fine lock
backup (1,0,1) using FGS-1
Observations affected: None.
COMPLETED OPS REQUEST:
18469-0 - Clear COS Event Flag 2 after NUV initial turn on
Part 2 completes @ 153/1347z
18466-0 - Clear STIS Event Flag 2 (MAMA1 Checkout Part 2)
@ 153/1428z
18471-1 - Update ACS CEB-R ASIC Offsets @ 153/1755z
18470-0 - 1st AMA Move for FGS2R2 @ 153/2155z
COMPLETED OPS NOTES: (None)
SCHEDULED
SUCCESSFUL
FGS
GSAcq
9
9
FGS
REAcq
0
0
OBAD with Maneuver
6
6
SIGNIFICANT EVENTS:
Flash Report:
The 1st FGS2R2 AMA Move was executed 153/21:42-21:55.