Detector 8

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'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.
  • 2017 April 17. D8 events were turned on; Front Fast threshold was adjusted
2017-107-21:31:35 start idib_on_g8
2017-107-21:32:20 start ihv_ramp_stage2_g8 ; 1000 V
2017-107-23:09:58 start ihv_ramp_stage3_g8
17-108-00:40:32 start idib_chg_thrshld(8, FRONT, FAST, 0x90)
  • 2017 April 25: Raised front fast threshold from 0x90 to 0xB0, increased live time from 2.7% to 73%
2017-116-00:08:38 /IDPUTABLE8 OFFSET=FRONTFASTDAC
2017-116-00:08:48 /IDPULOAD VALUE=0xA0 ; was 0x90

2017-116-00:09:33 /IDPUTABLE8 OFFSET=FRONTFASTDAC
2017-116-00:09:41 /IDPULOAD VALUE=0xB0 ; was 0xA0
  • 2017 August 16: Raised front slow threshold to reduce low-energy noise
17-228-19:55:15 start idib_chg_thrshld(8,FRONT,SLOW,0x20)
17-228-19:55:19 /IDPUDUMPTABL TABLE=DIBTBL8
17-228-19:55:19 /IDPUTABLE8 OFFSET=FRONTSLOWDAC
17-228-19:55:26 /IDPULOAD VALUE=0x20
  • 2017 November 3: Raised rear fast threshold to 0xFF
17-307-16:32:21 start idib_chg_thrshld(8,rear,fast,0xFF) ; was 0xC0
17-307-16:32:25 /IDPUDUMPTABL TABLE=DIBTBL8
17-307-16:32:25 /IDPUTABLE8 OFFSET=REARFASTDAC
17-307-16:32:37 /IDPULOAD VALUE=0xFF


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
2017-Aug-16 19:55:26 0x20
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)
2017-04-18 00:40:32 0x90 (was 0x60)
2017-04-26 00:09:41 0xB0 (was 0x90)
2017-05-09 19:08:43 0xE0 (was 0xC0)

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)
2017-05-09 19:09:28 UTC 0xC0 (was 0xA0)
2017-Nov-03 16:32:21 0xFF (was 0xC0)

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)
2016-Oct-13 16:14:04 0V
2017-01-17 23:32:29 3000 V (was OFF)
2017-Jan-19 0V
2017-Apr-3 2000 V
2017-Apr-11 0 V
2017-Apr-18 2000 V
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