From RHESSI Wiki
'This page contains information about changes/issues for RHESSI detector 8 after the 2014 anneal. Detector updates from 2012-mid 2014 can be found here: Detector 8 anneal 2012
Notes
Detector 8 is SEGMENTED after the 2014 anneal!
On March 13, 2015 the rear fast threshold was changed.
15-072-22:05:41 /IDPUTABLE8 OFFSET=REARFASTDAC
15-072-22:05:56 /IDPLOAD VALUE=0x55
- On April 7 2015, the rear fast threshold was changed due to extremely low livetime in the rear segment. It is not clear if this helped; the action will probably be repeated.
15-097-19:57:24 /IDPUTABLE8 OFFSET=REARFASTDAC
15-097-19:57:37 /IDPLOAD VALUE=0x70 ; was 0x65
- On April 9 2015, the rear fast threshold was changed due to low livetime in the rear segment.
15-099-17:38:09 /IDPUTABLE8 OFFSET=REARFASTDAC
15-099-17:38:23 /IDPLOAD VALUE=0x80 ; was 0x70
- On April 13 at 17:47UT we changed the Rear Fast threshold for detector 8.
15-103-17:46:36 /IDPUTABLE8 OFFSET=REARFASTDAC
15-103-17:46:47 /IDPLOAD VALUE=0x90 ; was 0x80
- On April 14 at 17:25 UT we changed the Rear Fast threshold for detector 8.
15-104-17:25:11 /IDPUTABLE8 OFFSET=REARFASTDAC
15-104-17:25:22 /IDPLOAD VALUE=0xA0 ; was 0x90
- On April 24 at 19:14 UT Rear Fast Threshold was increased.
15-114-19:14:10 /IDPUTABLE8 OFFSET=REARFASTDAC
15-114-19:14:20 /IDPLOAD VALUE=0xB0 ; was 0xA0
- On May 4 at 20:49 UT Rear Fast Threshold was increased
15-124-20:49:54 /IDPUTABLE8 OFFSET=REARFASTDAC
15-124-20:50:09 /IDPLOAD VALUE=0xC0 ; was 0xB0
- On May 15 the front slow threshold was increased
2015-135-21:36:06 /IDPUTABLE8 OFFSET=FRONTSLOWDAC
2015-135-21:36:25 /IDPLOAD VALUE=0x15 ; was 0x0C
- On June 11 2015 the front fast threshold was raised because the fast rates were high and the livetime was low. This action was NOT successful in reducing the fast rates -- they dropped ever so slightly but not much. Therefore, the livetime remained low.
- Late July 2015: D8 rear has not been returning good data since mid-May, but it was noticed that its fast threshold was never turned up all the way. On July 24 2015 the rear fast threshold was maxed out to see if that recovered a usable level of events from this detector. Unfortunately, it was not successful.
2015-205-17:21:40 /IDPUTABLE8 OFFSET=REARFASTDAC
2015-205-17:21:50 /IDPLOAD VALUE=0xFF ; was 0xD0
- 15 September 2015: The front slow threshold was raised to try to eliminate low energy noise counts.
2015-258-17:09:51 /IDPUTABLE8 OFFSET=frontslowDAC
2015-258-17:10:22 /IDPLOAD VALUE=0x20 ; was 0x15
- On October 28 in an attempt to lower the high reset rates and the front slow counts registered the HV on the detector was changed to ~2181.
2015-301-20:29:56 /ihvdac detector=8, voltage=112
D8 front slow LLD threshold history
post 2014 anneal | 0x0C
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2015-May-15 21:36:25 | 0x15 (was 0x0C)
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2015-Sep-15 17:35 | 0x20 (was 0x15)
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D8 front fast LLD threshold history
post 2014 anneal | 0x22
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2015-Jun-11 20:18:18 | 0x30 (was 0x22)
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2015-Jul-31 21:41:31 | 0x40 (was 0x30)
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2015-Aug-03 20:31:56 | 0x50 (was 0x40)
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2015-Aug-28 17:35:18 | 0x60 (was 0x50)
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D8 rear slow LLD threshold history
D8 rear fast LLD threshold history
post 2014 anneal | 0x45
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2015-Mar-13 22:05:56 | 0x55 (was 0x45)
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2015-Mar-25 19:30:35 | 0x65 (was 0x55)
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2015-Apr-07 19:58 | 0x70 (was 0x65)
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2015-Apr-09 17:38:23 | 0x80 (was 0x70)
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2015-Apr-13 17:46:47 | 0x90 (was 0x80)
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2015-Apr-14 17:25:22 | 0xA0 (was 0x90)
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2015-Apr-24 19:14:20 | 0xB0 (was 0xA0)
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2015-May-04 20:49:54 | 0xC0 (was 0xB0)
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2015-Jul-24 17:21:50 | 0xFF (was 0xD0)
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D8 HV history
post 2014 anneal | 3995 V
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2015-May-8 22:33:30 | 3554 V (was 3995 V)
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2015-May-12 21:03:52 | 2573 V (was 3554 V)
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2015-Oct-28 20:29:56 | 2181 V (was 2573 V)
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