Detector 9 anneal 2012

From RHESSI Wiki

• 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).

• 7 - 14 March 2012: Some noise was observed on detector 9. On March 8 at 01:24 UTC detector G9 HV was lowered by ten counts. Some sporadic noise was observed, but the detector appears to fixed it-self.

• 11 - 18 April 2012:
  • Rear fast threshold from 0x45 -> 0x60
    • /IDPUDUMPTABL DIBTBL9
    • /IDPUTABLE9 REARFASTDAC  ;Load address 0x262C
    • /IDPULOAD VALUE=0x60  ;Byte 10, Rear Fast threshold

• May 3-7+: 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 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 May 8 tohban report.