From RHESSI Wiki
This page contains information about changes/issues for RHESSI detector 1 after the 2014 anneal. Detector 1 updates from 2012-mid 2014 can be found here: Detector 1 anneal 2012
Notes
Detector 1 is SEGMENTED following the 2014 anneal (yay!)
- The rear fast threshold was changed on July 13 2015 due to dropping livetime in the rear:
2015-194-16:33:58 /IDPUTABLE1 OFFSET=REARFASTDAC
2015-194-16:34:12 /IDPLOAD VALUE=0x50 ; was 0x45
- The rear fast threshold was changed on July 24 2015 due to low livetime. However, the change probably wasn't needed; the tohban hadn't noticed that a change had already been made a few days ago. The next tohban can reverse the change if desired.
2015-205-17:18:59 /IDPUTABLE1 OFFSET=REARFASTDAC
2015-205-17:19:08 /IDPLOAD VALUE=0x70 ; was 0x60
- The rear fast threshold was changed on Sep 9 2015 due to low livetime.
2015-252-17:51:10 /IDPUTABLE1 OFFSET=REARFASTDAC
2015-252-17:51:17 /IDPLOAD VALUE=0x80 ; was 0x70
- On October 8, 9, and 12, the rear fast threshold was raised three times to try and raise livetime. Results still need to be assessed.
2015-281-21:50:13 /IDPUTABLE1 OFFSET=REARFASTDAC
2015-281-21:50:24 /IDPLOAD VALUE=0xA0 ; was 0x90
2015-282-19:55:48 /IDPUTABLE1 OFFSET=REARFASTDAC
2015-282-19:55:58 /IDPLOAD VALUE=0xB0 ; was 0xA0
2015-285-21:51:28 /IDPUTABLE1 OFFSET=REARFASTDAC
2015-285-21:51:37 /IDPLOAD VALUE=0xC0 ; was 0xB0
- Also on October 12, the front fast threshold on D1 (and also D7) was raised. This is to try and top off the livetime used in the attenuator logic. It might not work, since the fast rates are not terribly high for this detector, in which case the change could be reversed by a future tohban. Check this and see..
2015-285-20:16:55 /IDPUTABLE1 OFFSET=FRONTFASTDAC
2015-285-20:17:03 /IDPLOAD VALUE=0x50 ; was 0x40
- On November 6, 7, 8. the rear fast threshold was raised three times to try and raise livetime. At 0xFF the live time is at 70%
2015-312-06:16:29 /IDPUTABLE1 OFFSET=REARFASTDAC
2015-312-06:16:52 /IDPLOAD VALUE=0xE0 ; was 0xD0
2015-313-19:22:53 /IDPUTABLE1 OFFSET=REARFASTDAC
2015-313-19:23:03 /IDPLOAD VALUE=0xF0 ; was 0xE0
2015-314-18:55:49 /IDPUTABLE1 OFFSET=REARFASTDAC
2015-314-18:56:05 /IDPLOAD VALUE=0xFF ; was 0xFF
- 2015 November 14 lowered HV by 200 V in an attempt to reduce D1 rear, fast rates
2015-348-18:19:00 /IHVDAC DETECTOR=1, VOLTAGE=176 ; 34-6.8 V
- 2015 December 28 lowered HV by 200 V in an attempt to reduce D1 dead time
2015-362-09:13:58 /ihvdac detector=1, voltage=166 ; Lowered G1 HV by 200V
D1 front slow LLD threshold history
D1 front fast LLD threshold history
post 2014 anneal | 0x22
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2015-May-12 21:01:12 | 0x30 (was 0x22)
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2015-May-12 21:10:35 | 0x40 (was 0x30)
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2015-Oct-12 20:17:03 | 0x50 (was 0x40)
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D1 rear slow LLD threshold history
D1 rear fast LLD threshold history
post 2014 anneal | 0x45
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2015-Jul-13 16:34:12 | 0x50 (was 0x45)
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2015-Jul-24 17:19:08 | 0x70 (was 0x60)
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2015-Sep-9 17:51:17 | 0x80 (was 0x70)
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2015-Sep-17 06:36:06 | 0x90 (was 0x80)
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2015-Oct-08 21:50:24 | 0xA0 (was 0x90)
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2015-Nov-06 06:16:52 | 0xE0 (was 0xD0)
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2015-Nov-07 19:23:03 | 0xF0 (was 0xE0)
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2015-Nov-08 18:56:05 | 0xFF (was 0xF0)
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D1 HV history
post 2014 anneal | 3995 V
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2015-Dec-14 18:19:00 UTC | 3407V
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2015-Dec-28 09:13:00 UTC | 3210V
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