Detector 6 anneal 2012

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* 05-Mar-2014: D6 front fast LLD was raised 0x70 to 0x80 at 2014/058 19:25 UTC. In D6 rear fast valids,  no commanding was done to this segments, but the rear fast valids have risen to to ~1,000 --> 5,000 counts over the week, which is now comparable to D9r fast rates. Their lifetime is still at 98%.
* 05-Mar-2014: D6 front fast LLD was raised 0x70 to 0x80 at 2014/058 19:25 UTC. In D6 rear fast valids,  no commanding was done to this segments, but the rear fast valids have risen to to ~1,000 --> 5,000 counts over the week, which is now comparable to D9r fast rates. Their lifetime is still at 98%.
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* 2014 Mar 10: D6 front fast threshold was raised from 0x80 to 0x90 at 2014-070-03:00 UTC due to rapidly decreased livetime (down to 10% at the time of the commanding). The livetime immediately recovered to ~80%.

Revision as of 18:55, 12 March 2014

Detector 6 had no notable issue since the 2012 anneal until the noise/livetime problem occurred in 2014 Jan.

On 2014 Jan 3, Hugh Hudson noticed that the attenuator system has been in state 3 for a few days. It turned out that, in Detector 6 (both front and rear), livetime was decreasing rapidly and preamp-reset and FAST LLD were also rapidly increasing (See also Tohban_Report_2014-01-08). Then, over the next few days, several adjustments were made to D6 high voltage and FAST threshold (both front and rear) as described below.


   14-004-06:54:40 /ihvdac detector=6, voltage=198
   14-005-08:14:37 /ihvdac detector=6, voltage=148   (2868 V)
   14-005-08:16:00 /ihvdac detector=6, voltage=138   (2671 V)
   14-006-08:03:32 /idpudumptabl dibtbl6
   14-006-08:03:57 /idputable6 frontfastdac
   14-006-08:04:08 /idpuload value=0x50
   14-008-07:35:20 /idputable6 rearfastdac
   14-008-07:35:40 /idpuload value=0x55
   14-008-07:36:03 /idputable6 rearfastdac
   14-008-07:36:56 /idpuload value=0x60
   14-008-07:37:49 /ihvdac detector=6, voltage=148
   14-008-07:39:15 /ihvdac detector=6, voltage=158 (3063 V)
   14-008-09:15:22 /ihvdac detector=6, voltage=168 (3259 V)
   14-008-09:18:13 /idputable6 frontfastdac
   14-008-09:18:39 /idpuload value=0x64
   14-008-09:24:57 /idputable6 frontfastdac
   14-008-09:25:28 /idpuload value=0x50
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