Detector 4
From RHESSI Wiki
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15-232-22:19:23 /IDPUTABLE4 OFFSET=FRONTFASTDAC | 15-232-22:19:23 /IDPUTABLE4 OFFSET=FRONTFASTDAC | ||
15-232-22:19:32 /IDPLOAD VALUE=0xB0 | 15-232-22:19:32 /IDPLOAD VALUE=0xB0 | ||
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| + | * On Aug 24, 2015 the front fast threshold was raised twice to free up livetime. This was successful. Note that these changes are working, but we're almost out of head room! | ||
| + | 2015-236-20:44:08 /IDPUTABLE4 OFFSET=FRONTFASTDAC | ||
| + | 2015-236-20:44:22 /IDPLOAD VALUE=0xD0 ; was 0xB0 | ||
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| + | 2015-237-00:02:14 /IDPUTABLE4 OFFSET=FRONTFASTDAC | ||
| + | 2015-237-00:02:22 /IDPLOAD VALUE=0xE0 ; was 0xD0 | ||
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===D4 front slow LLD threshold history=== | ===D4 front slow LLD threshold history=== | ||
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| 2015-Aug-20 22:19:32 UTC || 0xB0 (was A0) | | 2015-Aug-20 22:19:32 UTC || 0xB0 (was A0) | ||
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| + | | 2015-Aug-24 20:44:22 UTC || 0xD0 (was B0) | ||
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| + | | 2015-Aug-25 00:02:22 UTC || 0xE0 (was D0) | ||
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Revision as of 17:00, 26 August 2015
This page contains information about changes/issues for RHESSI detector 4 after the 2014 anneal. Detector updates from 2012-mid 2014 can be found here: Detector 4 anneal 2012
Contents |
Notes
After the 2014 anneal, detector 4 is UNSEGMENTED.
- On May 21 starting at 19:24 UTC we raised up the Slow threshold for the Front segment.
15-141-19:24:10 start idib_chg_thrshld (4, FRONT, SLOW, 0x68) --> Was 0x60 15-141-19:24:22 /IDPUDUMPTABL TABLE=DIBTBL4 15-141-19:24:22 /IDPUTABLE4 OFFSET=FRONTSLOWDAC 15-141-19:24:31 /IDPLOAD VALUE=0x68
- Raised front fast threshold due to elevated counts. This change reduced counts and increased livetime
2015-152-17:00:18 /IDPUTABLE4 OFFSET=FRONTFASTDAC 2015-152-17:00:31 /IDPLOAD VALUE=0x60 ; was 0x50
- On 2015 July 7, D4 front fast threshold was raised due to decreased livetime.
2015-188-18:48:17 /IDPUTABLE4 OFFSET=FRONTFASTDAC 2015-188-18:48:34 /IDPLOAD VALUE=0x70 ; was 0x60
- The front fast threshold was increased on July 10 2015 due to low livetime due to high fast rates. This action was effective in raising the livetime.
2015-191-19:21:17 /IDPUTABLE4 OFFSET=FRONTFASTDAC 2015-191-19:21:25 /IDPLOAD VALUE=0x80 ; was 0x70
- The front fast threshold was increased on July 24 2015 due to low livetime due to high fast rates. This action was effective in raising the livetime, to ~90%.
2015-205-17:22:21 /IDPUTABLE4 OFFSET=FRONTFASTDAC 2015-205-17:22:30 /IDPLOAD VALUE=0x90 ; was 0x80
- 2015-08-13: Front slow valid threshold was raised by 10 steps; trying to get the slow valid rates down.
2015-225-16:45:08 /IDPUTABLE4 OFFSET=FRONTSLOWDAC 2015-225-16:45:20 /IDPLOAD VALUE=0x80 ; was 0x70
- On Aug 20, 2015 the front fast threshold was raised, in two commands of 16 steps each, in order to lower fast rates and free up livetime. This was successful but probably needs to be repeated. Livetime rose from ~0% to ~50%. The D4 threshold should be raised again to further raise the livetime.
15-232-22:17:53 start idib_chg_thrshld (4, FRONT, FAST, 0xA0) 15-232-22:18:12 /IDPUDUMPTABL TABLE=DIBTBL4 15-232-22:18:12 /IDPUTABLE4 OFFSET=FRONTFASTDAC 15-232-22:18:25 /IDPLOAD VALUE=0xA0
15-232-22:19:13 start idib_chg_thrshld (4, FRONT, FAST, 0xB0) 15-232-22:19:23 /IDPUDUMPTABL TABLE=DIBTBL4 15-232-22:19:23 /IDPUTABLE4 OFFSET=FRONTFASTDAC 15-232-22:19:32 /IDPLOAD VALUE=0xB0
- On Aug 24, 2015 the front fast threshold was raised twice to free up livetime. This was successful. Note that these changes are working, but we're almost out of head room!
2015-236-20:44:08 /IDPUTABLE4 OFFSET=FRONTFASTDAC 2015-236-20:44:22 /IDPLOAD VALUE=0xD0 ; was 0xB0
2015-237-00:02:14 /IDPUTABLE4 OFFSET=FRONTFASTDAC 2015-237-00:02:22 /IDPLOAD VALUE=0xE0 ; was 0xD0
D4 front slow LLD threshold history
| post 2014 anneal | 0x50 |
| 2015 May 21 19:24 UTC | 0x70 (was 0x60) |
| 2015 Aug 13 16:45 UTC | 0x80 (was 0x70) |
D4 front fast LLD threshold history
| post 2014 anneal | 0x30 |
| 2014-Dec-8 after 22:05 UTC | 0x50 (was 0x30) |
| 2015-Jun-02 17:00:31 UTC | 0x60 (was 0x50) |
| 2015-Jul-07 18:48:34 UTC | 0x70 (was 0x60) |
| 2015-Jul-07 19:21:25 UTC | 0x80 (was 0x70) |
| 2015-Jul-24 17:22:30 UTC | 0x90 (was 0x80) |
| 2015-Aug-20 22:18:25 UTC | 0xA0 (was 90) |
| 2015-Aug-20 22:19:32 UTC | 0xB0 (was A0) |
| 2015-Aug-24 20:44:22 UTC | 0xD0 (was B0) |
| 2015-Aug-25 00:02:22 UTC | 0xE0 (was D0) |
D4 rear slow LLD threshold history
| post 2014 anneal | 0x30 |
D4 rear fast LLD threshold history
| post 2014 anneal | 0x45 |
D4 HV history
| post 2014 anneal | 4510 V |
