Detector 2
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Revision as of 19:19, 24 September 2014
This page contains information about changes/issues for RHESSI detector 2 after the 2014 anneal. Detector updates from 2012-mid 2014 can be found here: Detector 2 anneal 2012
Contents |
Notes
Detector 2 is UNSEGMENTED (no surprise there) following the 2014 anneal.
- 2014-Aug-21 Due to noise in D2, the HV was lowered by 20 counts to 4117V at 2014-233-20:41:14 UT. This was successful in quieting the noise.
- 2014-Aug-26: D2 is suffering a lot from the known light leak problem. This does not affect the quality of the data but greatly reduces livetime at times when light leaks in through the cryostat port. To alleviate this problem, the G2 front fast threshold was raised from 0x30 to 0x38 at 2014-238-19:22:56 UTC. This didn't seem to fix the problem.
- Another threshold change to try and fix the light leak issue:
14-241-18:33:28 /IDPUTABLE2 FRONTFASTDAC 14-241-18:33:56 /IDPULOAD VALUE=0x40 ;Front fast from 0x38 to 0x40
- Front Fast rates have become significantly worse, requested a threshold change
14-260-16:36:36 /IDPUTABLE2 OFFSET=FRONTFASTDAC 14-260-16:36:51 /IDPULOAD VALUE=0x50
D2 front slow LLD threshold history
| post 2014 anneal | 0x50 |
D2 front fast LLD threshold history
| post 2014 anneal | 0x30 |
| 2014-08-29 19:22:56 UTC | 0x38 (was 0x30) |
| 2014-08-26 18:33:28 UTC | 0x40 (was 0x38) |
| 2014-260-16:36:51 UTC | 0x50 (was 0x40) |
| 2014-09-22 20:37:41 UTC | 0x60 (was 0x50) |
D2 rear slow LLD threshold history
| post 2014 anneal | 0x30 |
D2 rear fast LLD threshold history
| post 2014 anneal | 0x45 |
D2 HV history
| post 2014 anneal | 4510 V |
| 2014-Aug-21 20:41:14 UTC | 4117V |
