Tohban Report 2015-08-26
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Tohban Reports | |
---|---|
Start Date: | 19 Aug 2015 |
End Date: | 26 Aug 2015 |
Tohban: | Lindsay Glesener |
Tohban email: | glesener@ssl.berkeley.edu |
Next Tohban: | TBD |
List all reports |
Contents |
Solar Activity
We had an active week with many M flares.
Memory Management
On Aug 20/21, the SSR filled up due to skyrocketing ULD events in D9 rear. See description below.
Spacecraft Status
Data Gaps
Some long gaps (~half a day) due to need to skip pointer after SSR filled up.
Detector issues
Some threshold were changed on Aug. 20 around ~22:20:
Detectors 3 and 4: The front fast thresholds were raised in order to lower fast rates and free up livetime. Both changes were successful in achieving this. For D3, livetime rose from ~50% to >90%. For D4, livetime rose from ~0% to ~50%. The D4 threshold should be raised again to further raise the livetime. Over the next few days this action was not repeated because the D9 business ate up my own livetime.
Detector 9: More on the D9 rear ULD escapade below; here is only a note on the front threshold change, which occurred on Aug. 20. This was an attempt to free up livetime, but it was unsuccessful; there was no measured effect. D9 front livetime is very low, about 15%.
Detector 6: D6 is not in good shape, with high slow and fast rates, high resets, and somewhat reduced livetime in the front. Livetime is also somewhat low in the rear segment, and fast rates are high, but the rear resets are not terrible. This detector needs attention (first try fast threshold changes in front and rear) but there wasn't time for it this week.
15-232-22:16:08 start idib_chg_thrshld (3, FRONT, FAST, 0x50) 15-232-22:16:30 /IDPUDUMPTABL TABLE=DIBTBL3 15-232-22:16:30 /IDPUTABLE3 OFFSET=FRONTFASTDAC 15-232-22:16:41 /IDPLOAD VALUE=0x50
15-232-22:17:53 start idib_chg_thrshld (4, FRONT, FAST, 0xA0) 15-232-22:18:12 /IDPUDUMPTABL TABLE=DIBTBL4 15-232-22:18:12 /IDPUTABLE4 OFFSET=FRONTFASTDAC 15-232-22:18:25 /IDPLOAD VALUE=0xA0
15-232-22:19:13 start idib_chg_thrshld (4, FRONT, FAST, 0xB0) 15-232-22:19:23 /IDPUDUMPTABL TABLE=DIBTBL4 15-232-22:19:23 /IDPUTABLE4 OFFSET=FRONTFASTDAC 15-232-22:19:32 /IDPLOAD VALUE=0xB0
15-232-22:21:09 start idib_chg_thrshld (9, FRONT, FAST, 0x90) 15-232-22:21:38 /IDPUDUMPTABL TABLE=DIBTBL9 15-232-22:21:38 /IDPUTABLE9 OFFSET=FRONTFASTDAC 15-232-22:21:46 /IDPLOAD VALUE=0x90
More on D9 ULD anomaly:
Other notes
Spacecraft Management
Decimation | Normal/Vigorous |
Night time data (fronts) | +- 4 minutes |
Night time data (rears) | +- 4 minutes |
Require extra passes? | No |
Requirement for moving pointer? | YES |
Attenuator operation | Normal |