ACIS SOT Shift report L3014 Oct 22, 2007 07:00 EDT, 2007:295:11:00 GMT
  COMM Periods:
	  = 2007 Oct 22		 7:00 am EDT
	  = 2007 Oct 22		 8:00 am EDT
    also
	  = 2007 Oct 22		 9:24 am EDT
	  = 2007 Oct 22		10:23 am EDT

See http://asc.harvard.edu/acis/SOT_reports/sot_shift.html or
/proj/web-cxc/htdocs/acis/SOT_reports/Oct_22_2007_L3014_acis.txt

ACIS Personnel:
Royce Buehler

PLAN:
-----
  We plan to monitor the ACIS detector housing cooling test that is
being performed during the Chandra Deep Field South observation (OBSID
8592).  Additional updates will be sent for upcoming passes at
295:16:20, 296:03:45, and after the housing heater is repowered
at 296:11:00.

The command to turn off the heater was executed in the load at:

2007:294:22:32:18.658    COMMAND_HW 1HHTRBOF

and the heater will be turned on again at:

2007:296:10:56:14.111    COMMAND_HW 1HHTRBON

for a total of about 131 ks of cooling time.

SUMMARY:
-------
  The 7 am EDT pass was intended as a DSN test pass, and was
terminated after about half an hour. We were able to verify that
the Detector Housing Heater command had taken effect, though
neither camera body had passed its yellow limit yet.
The telemetry seen was:

1DAHTBEN=EN
1DAHTBON=OFF
1DAHHBVO= 28.84   (value of the mean over 10 samples)
1DAHBVO= 0.00     (value of the mean over 10 samples)
1DAHBCU= 0.00     (value of the mean over 10 samples)
1CBBT= -62.4      (value of the mean over 10 samples)
1CBAT= -62.4      (value of the mean over 10 samples)
1WRBT= -82.0      (value of the mean over 10 samples)
1WRAT= -82.0      (value of the mean over 10 samples)

  At the 9:30 am EDT pass, we got one more tick of cooling on the
A side. The telemetry seen was:

1DAHTBEN=EN
1DAHTBON=OFF
1DAHHBVO= 28.84   (value of the mean over 10 samples)
1DAHBVO= 0.00     (value of the mean over 10 samples)
1DAHBCU= 0.00     (value of the mean over 10 samples)
1CBBT= -62.4      (value of the mean over 10 samples)
1CBAT= -63.3      (value of the mean over 10 samples)
1WRBT= -82.0      (value of the mean over 10 samples)
1WRAT= -82.0      (value of the mean over 10 samples)

When the pass finished at 14:23:23, 1CBAT had descended further
to -64.8. The other verifiers remained stable.

The next comm will be at 2007:295:16:20.