Detector 8

'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 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.

D8 front slow LLD threshold history

post 2014 anneal

0x0C

D8 front fast LLD threshold history

post 2014 anneal	0x22
2015-Jun-11 20:18:18	0x30 (was 0x22)

D8 rear slow LLD threshold history

post 2014 anneal

0x30

D8 rear fast LLD threshold history

post 2014 anneal	0x45
2015-Mar-13 22:05:56	0x55 (was 0x45)
2015-Mar-25 19:30:35	0x65 (was 0x55)
2015-Apr-07 19:58	0x70 (was 0x65)
2015-Apr-09 17:38:23	0x80 (was 0x70)
2015-Apr-13 17:46:47	0x90 (was 0x80)
2015-Apr-14 17:25:22	0xA0 (was 0x90)
2015-Apr-24 19:14:20	0xB0 (was 0xA0)
2015-May-04 20:49:54	0xC0 (was 0xB0)

D8 HV history

post 2014 anneal	3995 V
2015-May-8 22:33:30	3554 V (was 3995 V)
2015-May-12 21:03:52	2573 V (was 3554 V)