Detector 2

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'''UPDATE IN PROGRESS'''
 
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This page contains information about changes/issues for RHESSI detector 2 after the 2014 anneal.  Detector updates from 2012-mid 2014 can be found here: [[Detector 2 anneal 2012]]
This page contains information about changes/issues for RHESSI detector 2 after the 2014 anneal.  Detector updates from 2012-mid 2014 can be found here: [[Detector 2 anneal 2012]]
===Notes===
===Notes===
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Detector 2 is UNSEGMENTED (no surprise there) following the 2014 anneal.
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* 2014-Aug-21  Due to noise in D2, the HV was lowered by 20 counts to 4117V at 2014-233-20:41:14 UT.  This was successful in quieting the noise.
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* 2014-Aug-26: D2 is suffering a lot from the known light leak problem.  This does not affect the quality of the data but greatly reduces livetime at times when light leaks in through the cryostat port.  To alleviate this problem, the G2 front fast threshold was raised from 0x30 to 0x38 at 2014-238-19:22:56 UTC.  This didn't seem to fix the problem.
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* Another threshold change to try and fix the light leak issue:
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  14-241-18:33:28 /IDPUTABLE2 FRONTFASTDAC
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  14-241-18:33:56 /IDPULOAD VALUE=0x40    ;Front fast from 0x38 to 0x40
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* Front Fast rates have become significantly worse, requested a threshold change
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  14-260-16:36:36 /IDPUTABLE2 OFFSET=FRONTFASTDAC
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  14-260-16:36:51 /IDPULOAD VALUE=0x50
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* Front Slow Threshold was changed on May 21
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15-141-19:22:50 start idib_chg_thrshld (2, FRONT, SLOW, 0x58)  --> Was 0x50
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15-141-19:23:05 /IDPUDUMPTABL TABLE=DIBTBL2
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15-141-19:23:05 /IDPUTABLE2 OFFSET=FRONTSLOWDAC
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15-141-19:23:19 /IDPLOAD VALUE=0x58
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* Front Slow Threshold again raised. No appreciable difference in livetime or slow counts
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2015-152-17:01:00 /IDPUTABLE2 OFFSET=FRONTSLOWDAC
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2015-152-17:01:16 /IDPLOAD VALUE=0x70  ; was 0x58
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* 2015-Dec 9: D2 Front-fast threshold was raised from 0x70 to 0xFF in an attempt to reduce noise. As a result, the fast rates went down and D2 spectrum also showed reduced noise. The spectrum now looks typical as an unsegmented detector. We can't see the flare spectrum, but the slow threshold is set high enough that we wouldn't expect to see it.  We'll have to wait for a bigger flare to see if D2 is returning good flare data, but I don't see evidence of bad behavior.
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2015-343-23:42:10 /IDPUTABLE2 OFFSET=FRONTFASTDAC
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2015-343-23:42:25 /IDPLOAD VALUE=0xFF  ; 0x70
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* 2015 Dec 14 Lowered D2 HV by 200 V
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===Post 2016 Anneal===
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* 2016-May-12: D2 HV was ramped to 5000 V over the course of 4 orbits.  Along the way we increased the slow and fast front thresholds.  It did not show signs of segmentation. We then turned down the HV and turned off the DIB.
===D2 front slow LLD threshold history===
===D2 front slow LLD threshold history===
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{| class="wikitable"  
{| class="wikitable"  
|-  
|-  
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| post 2014 anneal || 0x
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| post 2014 anneal || 0x50
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|-
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| 2015 May 21 19:22:50 UTC || 0x58 (was 0x50)
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|-
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| 2015 Jun 2 17:01:16 UTC || 0x70 (was 0x58)
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|-
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| 2015 Jun 2 17:01:16 UTC || 0x70 (was 0x58)
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|-
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| post 2016 anneal || 0x30
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|-
|}
|}
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{| class="wikitable"  
{| class="wikitable"  
|-  
|-  
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| post 2014 anneal || 0x
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| post 2014 anneal || 0x30
|-  
|-  
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| GAP IN THRESHOLD VALUES - ADD IN LATER
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| 2014-08-29 19:22:56 UTC || 0x38 (was 0x30)
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|-  
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| 2014-08-29 18:33:28 UTC || 0x40
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| 2014-08-26 18:33:28 UTC || 0x40 (was 0x38)
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|-
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| 2014-260-16:36:51 UTC ||  0x50 (was 0x40)
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|-
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| 2014-09-22 20:37:41 UTC ||  0x60 (was 0x50)
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|-
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| 2015-08-28 20:51:49 UTC ||  0x70 (was 0x60)
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|-
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| 2015-12-09 23:42:25 UTC ||  0xFF (was 0x70)
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|-
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| 2015-12-17 20:24:50 UTC ||  0xA0 (was 0x70)
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|-
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| post 2016 anneal || 0x70
|-  
|-  
|}
|}
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{| class="wikitable"  
{| class="wikitable"  
|-  
|-  
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| post 2014 anneal || 0x
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| post 2014 anneal || 0x30
|}
|}
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{| class="wikitable"  
{| class="wikitable"  
|-  
|-  
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| post 2014 anneal || 0x
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| post 2014 anneal || 0x45
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|-  
|}
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| post 2014 anneal || 4510 V
| post 2014 anneal || 4510 V
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|-
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| 2014-Aug-21 20:41:14 UTC || 4117V
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|-
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| 2015-Dec-14 18:19:18 UTC || 3921V
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|-
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| 2015-12-17  18:44:42 UTC || 3500V
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|-
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| post 2016 anneal || 0 V
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|-
|}
|}

Latest revision as of 02:32, 18 May 2016

This page contains information about changes/issues for RHESSI detector 2 after the 2014 anneal. Detector updates from 2012-mid 2014 can be found here: Detector 2 anneal 2012

Contents

Notes

Detector 2 is UNSEGMENTED (no surprise there) following the 2014 anneal.

 14-241-18:33:28 /IDPUTABLE2 FRONTFASTDAC
 14-241-18:33:56 /IDPULOAD VALUE=0x40     ;Front fast from 0x38 to 0x40
 14-260-16:36:36 /IDPUTABLE2 OFFSET=FRONTFASTDAC
 14-260-16:36:51 /IDPULOAD VALUE=0x50
15-141-19:22:50 start idib_chg_thrshld (2, FRONT, SLOW, 0x58)  --> Was 0x50
15-141-19:23:05 /IDPUDUMPTABL TABLE=DIBTBL2
15-141-19:23:05 /IDPUTABLE2 OFFSET=FRONTSLOWDAC
15-141-19:23:19 /IDPLOAD VALUE=0x58
2015-152-17:01:00 /IDPUTABLE2 OFFSET=FRONTSLOWDAC 
2015-152-17:01:16 /IDPLOAD VALUE=0x70  ; was 0x58
2015-343-23:42:10 /IDPUTABLE2 OFFSET=FRONTFASTDAC
2015-343-23:42:25 /IDPLOAD VALUE=0xFF  ; 0x70

Post 2016 Anneal

D2 front slow LLD threshold history

post 2014 anneal 0x50
2015 May 21 19:22:50 UTC 0x58 (was 0x50)
2015 Jun 2 17:01:16 UTC 0x70 (was 0x58)
2015 Jun 2 17:01:16 UTC 0x70 (was 0x58)
post 2016 anneal 0x30

D2 front fast LLD threshold history

post 2014 anneal 0x30
2014-08-29 19:22:56 UTC 0x38 (was 0x30)
2014-08-26 18:33:28 UTC 0x40 (was 0x38)
2014-260-16:36:51 UTC 0x50 (was 0x40)
2014-09-22 20:37:41 UTC 0x60 (was 0x50)
2015-08-28 20:51:49 UTC 0x70 (was 0x60)
2015-12-09 23:42:25 UTC 0xFF (was 0x70)
2015-12-17 20:24:50 UTC 0xA0 (was 0x70)
post 2016 anneal 0x70

D2 rear slow LLD threshold history

post 2014 anneal 0x30

D2 rear fast LLD threshold history

post 2014 anneal 0x45

D2 HV history

post 2014 anneal 4510 V
2014-Aug-21 20:41:14 UTC 4117V
2015-Dec-14 18:19:18 UTC 3921V
2015-12-17 18:44:42 UTC 3500V
post 2016 anneal 0 V
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