To:sot_shift
from: Dan Schwartz
date: 14 Sep 99, 04:00pm EDT
Subject: SOT shift report, Shift L54
--------
See http://asc.harvard.edu/acis/SOT_reports/sot-shift.html, or 
/proj/ascwww/AXAF/extra/science/htdocs/acis/SOT_reports/Sep_14_1999_L54.txt.

Shift L54
	Start at 257:11:00  GMT
		 = 07:00am 14 Sep EDT
	End	   04:00pm 14 Sep
   
SOT Lead	DAS
Spac/Aspect	
FOT/Sci liason	
HRC		
ACIS 		

(Times will be given in GMT on day 257. In general
times are rough, not precise.)

PLAN
We are running without an on-board load. Currently in the radiation
  belts until ~18:19:00.
Approve and upload the P14 load, to do 2 long HR1099 coordinated
  observations with ACIS-S/HETG.
Upload the patches needed for the eclipse on 260:02:50 GMT
	(10:50 pm EDT on Thursday Sept 16.)


EVENTS
11:00	Start shift out of comm. In format 2, OBSID 62418, Still
	pointed at the NGC 2516 position, RA= 119.57896, dec = -60.76614
	roll = 126.7293.  Prior to this shift CAP 430 was run to safe
	ACIS for radiation belts, and to move the SIM to the ACIS-S
	viewing position (confirmed in ACA telemetry display). 
15:02   AOS on Madrid
15:05	start script for SSR playback
15:22	CAP 427 for K-constant changes to support eclipse operations.
16:03	Start CAP 422 for HRC door opening. (Had been closed since
	start of ACIS bakeout.)

	



NOTES/ISSUES/PROBLEMS
From the GOT:
"EHS is scheduled to come down for routine maintanence starting IMEDIATELY after
the satellite support which is scheduled to end at 1300 Local.  After the
contact terminates ALL users need to log off the system.  This down time will
last approximately 6 hours and EHS will not be available during this time."

Overnight report on quick look results from ACIS bakeout:
"The bakeout did not improve the performance of the FI devices; in fact,
the gain on s2 seems to have dropped 1-2% since the last comparable measurement
at this focal plane temperature (-100C), made some 44 hours ago."
		-- Fred and mark

Telecon on the gratings with MSFC/EKC/TRW discusses Flight note 318.
  Decides to operate with the MCE grating select relay in a fixed postion,
  so that we always get the back emf on the B-side. Advantange is that
  we are not cycling the actuation of the B-side hardware, unless it is
  ever actually used.  Also, the failure of the MCE electronics to turnoff,
  with the subsequent failure of grating insertion, is understood as a
  timing problem.  It requires as long as 6min30sec to get to the MCE
  power off, whereas the SCS had been set for 6 min.  It has been extended
  to 9 minutes in the current and subsequent loads.

We are in the radiation belts, so ACIS is not clocking its video boards.
  We will not have any other comm opportunity before the start of the
  HETG observations of HR1099, and since we are not continuing the 
  daily load, the video boards will NOT start clocking until the
  observation starts. Therefore we should anticipate ~~2Ksec of data
  with large delta overclocks at the beginning, which we may want
  to ignore.



-------------------------------------------------------
Dan Schwartz,	MS #3
das@head-cfa.harvard.edu  
phone: (617)495-7232    FAX:   (617)495-7356
cell phone: (617)512-5627   
pager: 800-759-8352 PIN 1636502
       or e-mail 1636502@skytel.com 
-------------------------------------------------------