Detector 9 anneal 2012

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Some "historical record searching" has revealed that noisy intervals have occasionally shown up in D9 ever since the March 2010 anomaly.  It is not clear that these were associated in any way with the anomaly, but no instances have been found before it.  These noisy intervals are easiest to see in the rear slow monitor rates or rear event rates.  See a [2013-04-17_Detector_9_weirdness presentation] by Albert Shih for more info.
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Some "historical record searching" has revealed that noisy intervals have occasionally shown up in D9 ever since the March 2010 anomaly.  It is not clear that these were associated in any way with the anomaly, but no instances have been found before it.  These noisy intervals are easiest to see in the rear slow monitor rates or rear event rates.  See a [[2013-04-17_Detector_9_weirdness presentation]] by Albert Shih for more info.
* 15 Feb 2012: Final stages of the anneal, all detectors, are back to 4000 V, except for detector 9 (which showed some arcing after SAA passages).  
* 15 Feb 2012: Final stages of the anneal, all detectors, are back to 4000 V, except for detector 9 (which showed some arcing after SAA passages).  
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*** /IDPULOAD VALUE=0x60  ;Byte 10, Rear Fast threshold
*** /IDPULOAD VALUE=0x60  ;Byte 10, Rear Fast threshold
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* March 4-19, 2013, March 29-April 11, 2013:  Noise on D9; see [Tohban_Report_2013-04-17] for more info.
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* March 4-19, 2013, March 29-April 11, 2013:  Noise on D9; see [[Tohban_Report_2013-04-17]] for more info.
* May 3-7+ 2013: Noise is back on D9.  Once again, it's occasional short intervals (a few minutes) of noise in the event rates.  This usually shows up as dropouts in the rear slow monitor rate plots.  The occurrences this week were short and not severe.  They happened around the following times:
* May 3-7+ 2013: Noise is back on D9.  Once again, it's occasional short intervals (a few minutes) of noise in the event rates.  This usually shows up as dropouts in the rear slow monitor rate plots.  The occurrences this week were short and not severe.  They happened around the following times:
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   May 4: 1937, 1803, 1625, 1004
   May 4: 1937, 1803, 1625, 1004
   May 3: 1152, 1015
   May 3: 1152, 1015
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No action was taken since the problem was not severe.  See more notes in the [Tohban_Report_2013-05-08] tohban report.
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No action was taken since the problem was not severe.  See more notes in the [[Tohban_Report_2013-05-08]] tohban report.

Revision as of 20:06, 8 May 2013

Some "historical record searching" has revealed that noisy intervals have occasionally shown up in D9 ever since the March 2010 anomaly. It is not clear that these were associated in any way with the anomaly, but no instances have been found before it. These noisy intervals are easiest to see in the rear slow monitor rates or rear event rates. See a 2013-04-17_Detector_9_weirdness presentation by Albert Shih for more info.

 May 7: 11:09
 May 6: 11:19, 9:42
 May 5: 9:54, 1130
 May 4: 1937, 1803, 1625, 1004
 May 3: 1152, 1015

No action was taken since the problem was not severe. See more notes in the Tohban_Report_2013-05-08 tohban report.

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