COS SMOV Morning Update
6 June 2009
Agenda
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COS FUV HV Turn-on Visit 2 (of 13)
COS NUV Functional Test
SAA Operating Characteristics
Upcoming COS SMOV Timeline
COS FUV HV Turn-on:
Visit 2 (of 13) HV to minimum level
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HV successfully taken from minimum (-2500 v) to HVLOW (-4069v)
Currents are normal on both segments
Plots of the current ring buffers and histograms for FUV ramp to HVLOW
on following page.
Recommend ops request to clear event flag 3, continue with next step in
FUV HV turn-on procedure
COS FUV HV Turn-on:
Visit 2 (of 13) HV to HVLOW
COS FUV HV Turn-on:
Visit 2 (of 13) HV to HVLOW
SAA Detection
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Both detectors see low levels of counts in SAA when at appropriate
SAA operating voltage
FUV also produces (mostly single) sporadic counts at HVLOW
even when not in SAA
Blue track: 17:20-17:40 UT
corresponds to upper-left count
level plot;
Upper-right count plot is from
next SAA passage (dotted track
adjacent blue to NW
COS NUV Functional Test
• The functional test (program 11467) obtains representative
exposures with NUV lamps and gratings
– one wavecal with each NUV grating (G185M, G225M, G285M,
G230L) with each PtNe lamp
– one MIRRORA and one MIRRORB image exposure with each PtNe
lamp
– One deuterium lamp exposure with lamp 1 (NOTE: deuterium lamp 2
used previously in fold test)
– One long-duration TAGFLASH exposure to examine OSM2 drift
• Establish spectrum and image locations that will be used in
the initial on-orbit update of target acquisition parameters
11467 executed successfully
• Quick look at data:
• All NUV gratings, MIRRORA and MIRRORB visited, all
lamps operated.
• All lamps functioned as expected, detailed analysis of spectra
in progress
• Spot check of 2006 TV data shows comparable count rates
• MIRRORA centroid change from pre-launch: ~+32 pixels in
y, -5 pixels in x - close to BASD predictions
• No apparent OSM2 drift in one 3600 sec exposure; detailed
analysis ongoing
• TA1 count rates unchanged from TV06 (~2788cps 6/5/2009
vs 2723cps in TV06)
• Image slightly broader (4.18 vs 3.91 pixels)
• With MAMA at 22-23C we get ~60 CPS background – still
much better than predicted.
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MIRRORA image
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MIRRORA image
only slightly
broader than in
Tvac-06 (4.18 vs
3.91 pixels
FWHM)
G225M WCA images from 11467
and from Tvac 06
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Image motion
consistent with
MIRRORA image
motion
Upcoming COS SMOV Timeline
• Day 157: Sat 06 June
– 11467: (COS06) NUV functional test
• 146701 157:00:00:00 - 157:02:20:06
– Evaluate image and spectrum locations; prepare updates of TA parameters to
be uploaded with SMS173 (input needed by day 167)
– 11466: 3 visits of 11 (COS05) NUV darks
• 1146601 157:07:00:00 - 157:08:01:34
• 1146602 157:09:39:50 - 157:11:07:27
• 1146603 157:16:22:05 - 157:17:48:56
– 11356 visit 3 of 13 (COS23) FUV HV Turn-on;
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ramp from HVLOW to first specified value, dump DCE, wave , dark exp
OPS request required: clear NSSC-1 COS event flag 3 set in 1135602
1135603 157:20:52:00 - 157:21:28:28
No event flag set; leave SI at HV level for 4 hours; then execute 1135604
– Contingency OPS request in place to place FUV in INHIBIT if anomaly
• science data
Upcoming COS SMOV Timeline
• Day 158: Sun 07 June
– 11356 visit 4 of 13 (COS23) FUV HV Turn-on;
• After 4-hour wait at first specified ramp value, dump DCE RAM, return
to HVLOW
• 1135604 158:01:07:00 - 158:01:08:36
• sets event flag 3
• OPS request required: clear NSSC-1 COS event flag 3 prior to visit 5
– 11466: 4 visits of 11 (COS05) NUV darks
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1146604
1146607
1146606
1146605
158:07:00:00 - 158:08:01:34
158:10:58:22 - 158:11:59:56
158:18:02:05 - 158:19:23:49
158:20:15:00 - 158:21:16:34
Upcoming COS SMOV Timeline
• Day 159: Mon 08 June
– 11356 visit 5 of 13 (COS23) FUV HV Turn-on
• ramp from HVLOW to second specified value, dump DCE, wave , dark
exp
• OPS request required: clear NSSC-1 COS event flag 3 set in 1135604
• 1135605 159:17:32:15 - 159:18:07:43
• No event flag set; leave SI at HV level for 4 hours; then execute 1135606
– Contingency OPS request in place to place FUV in INHIBIT if anomaly
• science data
– 11356 visit 6 of 13 (COS23) FUV HV Turn-on
• After 4-hour wait at first specified ramp value, dump DCE RAM, return
to HVLOW
• sets event flag 3
• 1135606 159:23:23:01 - 159:23:24:37
• OPS request required: clear NSSC-1 COS event flag 3 prior to visit 7
– 11466: 2 visits of 11 (COS05) NUV darks
• 1146608 159:06:58:00 - 159:07:59:34
• 1146609 159:20:19:00 - 159:21:20:34