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
Post 2014 Anneal
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
- November 14, HV dropped by 400V to 1789V
2015-318-07:02:37 /ihvdac detector=8, voltage=92
- November 23, HV dropped by 400 V to 1400 V in an attempt to reduce noise
2015-327-22:09:13 /ihvdac detector=8, voltage=72 ; (now 1397.1 V)
- December 28, D8 events were turned off; rear ULD events were filling memory
2015-362-10:52:03 /itmoff value=dib8 2015-362-10:52:09 start sc_tbl_loadpkt("T15362SLTN61_No_G3_G4_G8_G9.01")
Post 2016 Anneal
Detector 8 is SEGMENTED after the 2016 anneal!
- 2016-05-24: D8 rear is mimicing the light leak behavior seen in D3 although this has not previously been seen in D8. Its possible we see the light leak here because of other detectors being turned off
16-145-16:18:03 start idib_chg_thrshld(8, REAR, FAST, 0x60) 16-145-16:18:07 /IDPUDUMPTABL TABLE=DIBTBL8 16-145-16:18:07 /IDPUTABLE8 OFFSET=REARFASTDAC 16-145-16:18:16 /IDPULOAD VALUE=0x60
- 2016-08-15: Light leak threshold changes
16-228-22:52:25 start idib_chg_thrshld(8, REAR, FAST, 0x68) 16-228-22:52:28 /IDPUDUMPTABL TABLE=DIBTBL8 16-228-22:52:28 /IDPUTABLE8 OFFSET=REARFASTDAC 16-228-22:52:34 /IDPULOAD VALUE=0x68
- 2016-10-07: Rear fast threshold increase for dead time
2016-281-20:39:12 /IDPUTABLE8 OFFSET=REARFASTDAC 2016-281-20:39:22 /IDPULOAD VALUE=0x80
- 2016-10-09: Threshold changes to reduce dead time
16-283-19:43:43 start idib_chg_thrshld(8, FRONT, SLOW, 0x30) 16-283-19:43:47 /IDPUDUMPTABL TABLE=DIBTBL8 16-283-19:43:47 /IDPUTABLE8 OFFSET=FRONTSLOWDAC 16-283-19:43:55 /IDPULOAD VALUE=0x30 16-283-19:44:00 start write_ssr_info
16-283-19:44:16 start idib_chg_thrshld(8, FRONT, FAST, 0x40) 16-283-19:44:20 /IDPUDUMPTABL TABLE=DIBTBL8 16-283-19:44:20 /IDPUTABLE8 OFFSET=FRONTFASTDAC 16-283-19:44:24 /IDPULOAD VALUE=0x40
16-283-19:44:45 start idib_chg_thrshld(8, REAR, FAST, 0xA0) 16-283-19:44:48 /IDPUDUMPTABL TABLE=DIBTBL8 16-283-19:44:48 /IDPUTABLE8 OFFSET=REARFASTDAC 16-283-19:44:58 /IDPULOAD VALUE=0xA0
- 2016-10-10: Reverted front slow threshold, not much effect on dead time
16-284-22:33:32 start idib_chg_thrshld(8, FRONT, SLOW, 0x0C) 16-284-22:33:36 /IDPUDUMPTABL TABLE=DIBTBL8 16-284-22:33:36 /IDPUTABLE8 OFFSET=FRONTSLOWDAC 16-284-22:33:47 /IDPULOAD VALUE=0x0C
- 2016-10-11: Lowered HV to 3000V to decrease dead time, worked pretty well
16-285-18:48:24 /ihvdac detector=8, voltage=0x9A
- 2016-10-13: Turned off this detector
Turn off detector 8 16-287-16:14:04 /itmoff value=8 16-287-16:14:57 /ihvdac detector=8,voltage=0 16-287-16:16:53 /idibpwroff value=8
- 2017-01-17: Turned on
2017-017-18:38:37 start idib_on_g8 2017-017-18:39:29 start ihv_ramp_stage1_g8 ; 171 V
2017-017-20:14:00 start ihv_ramp_stage2_g8 ; 1000 V
2017-017-21:52:46 start ihv_ramp_stage3_g8 ; 2000 V
2017-017-23:32:39 start ihv_ramp_stage4_g8 ; 3000 V
2017-017-23:39:40 /IDPUTABLE8 OFFSET=FRONTSLOWDAC 2017-017-23:39:56 /IDPULOAD VALUE=0x15 ; was 0x0C
2017-018-01:14:25 /IDPUTABLE8 OFFSET=FRONTFASTDAC 2017-018-01:14:31 /IDPULOAD VALUE=0x60 ; was 0x40
2017-018-01:15:22 /IDPUTABLE8 OFFSET=FRONTSLOWDAC 2017-018-01:15:28 /IDPULOAD VALUE=0x1C ; was 0x15
- 2017 Jan 19: switched off
- 2017 April 3: Turned on in response to high solar activity. HV was raised to ~1000V at 16:25 and then up to ~2000V at 19:45 UT.
D8 front slow LLD threshold history
|post 2014 anneal||0x0C|
|2015-May-15 21:36:25||0x15 (was 0x0C)|
|2015-Sep-15 17:35||0x20 (was 0x15)|
|post 2016 anneal||0x0C|
|2016-10-09 19:43:55||0x30 (Was 0x0C)|
|2016-10-10 22:33:47||0x0C (Was 0x30)|
|2017-01-17 01:15:28||0x1C (Was 0x15)|
D8 front fast LLD threshold history
|post 2014 anneal||0x22|
|2015-Jun-11 20:18:18||0x30 (was 0x22)|
|2015-Jul-31 21:41:31||0x40 (was 0x30)|
|2015-Aug-03 20:31:56||0x50 (was 0x40)|
|2015-Aug-28 17:35:18||0x60 (was 0x50)|
|post 2016 anneal||0x22|
|2016-10-09 19:44:24||0x40 (was 0x22)|
|2016-01-17 01:14:31||0x60 (was 0x40)|
D8 rear slow LLD threshold history
|post 2014 anneal||0x30|
|post 2016 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)|
|2015-Jul-24 17:21:50||0xFF (was 0xD0)|
|post 2016 anneal||0x45|
|2016-May-24 16:18:16||0x60 (was 0x45)|
|2016-Aug-15 22:52:28||0x68 (was 0x60)|
|2016-10-07 19:44:58 UTC||0x80 (was 0x68)|
|2016-10-09 20:39:22 UTC||0xA0 (was 0x80)|
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)|
|2015-Oct-28 20:29:56||2181 V (was 2573 V)|
|2015-11-14 07:02:37||1789 V (was 2179 V)|
|2015-11-23 22:09:13||1397 V (was 1789 V)|
|post 2016 anneal||4019 V|
|2016-10-11 18:48:24||2990 V (was 4000 V)|
|2017-01-17 23:32:29||3000 V (was OFF)|