To:sot_shift
from: Dan Schwartz
date: 12 Sep 99, 11:30am EDT
Subject: SOT shift report, Shift L53
--------
See http://asc.harvard.edu/acis/SOT_reports/sot-shift.html, or 
/proj/ascwww/AXAF/extra/science/htdocs/acis/SOT_reports/Sep_13_1999_L53.txt.

Shift L47
	Start at 256:12:00  GMT
		 = 08:00am 13 Sep EDT
	End	   11:30am 13 Sep
   
SOT Lead	DAS
Spac/Aspect	WAP,
FOT/Sci liason	
HRC		JHC,
ACIS 		PPP,CG,ES,EB

(Times will be given in GMT on day 256. In general
times are rough, not precise.)

PLAN
Continue warmup phase of ACIS bakeout.
Load SCS to support bakeout cycle.
Plan for clock shifting to occur at room temp.

EVENTS
Start of shift, AOS until 13:00GMT. 
  Running OBSID 62421, pointed at the NGC 2516 position: 
  RA = 119.5751, dec = -60.772, roll=126.7184.  Have 5 stars, no fid lights.
  SIM position is at 75615, ACIS-S aim point; and -949, HRC-S
	focus position.

12:10  Load ACIS SOP 61024 and SAP 61076 to load up SCSs.
12:51  Temperatures are at focal plane =31.2 deg; detector
	housing =  -2.5 deg C. Preparing to start clocking
	in diagnostic mode.  CHANGE OF PLANS: hold off on
	clocking the chips for further MIT/Lincoln discussion.
	DECISION:  CCDs will not be clocked while warm.
14:05	LOS
14:20   AOS from Madrid. Start CAP 424, basically just execute
	step 4, SAP 61076 to cool back down, then step 8.
14:28   Step 7 of SAP 61076. Cooling housing to +10 deg C. 
	Need to wait till it reaches, then will start focal
	plane down to that temperature.
14:58   Resume script. Start cooling ACIS focal plane.
	Will hold here, and resume script again at the start
	of comm at 19:15.
15:15 LOS


NOTES/ISSUES/PROBLEMS
In order to clock the video boards, all heaters MUST BE OFF or 
we will draw too much power, and risk blowing the ACIS fuse!!

Terminated P13 daily load at 256:0838. We used OBSID 0068 and 
  obtained ~~12,500 seconds data on NGC 2516 before interrupting
  that observation.  We have not done the observations of LMC X-1
  and not used the OBSIDs 1154 through 1165 inclusive, and will 
  not do the Sirius/B LETG observations which use 0074 and 1274,
  during the P13 load. Presumably these OBSIDs can be rescheduled
  later if desired, with the same OBSID numbers.

Communications passes have been extended to offer support to 
   ACIS bakeout cycle as follows:
	256:08:00 to 256:14:10 (follow it to horizon)Canberra
	256:14:30 to 256:15:15 (baseline Madrid coverage)
	256:19:15 to 257:04:00 (extended Madrid coverage)
	257:07:20 to 257:08:20 (Baseline Goldstone coverage)

At this time, applying any voltage at room temperature was
not done, because of the concern that a positive voltage
would drive electrons up from the buried channel and into
the oxide/nitride interface layer, where they would be trapped
with extremely long time constants.  Future investigation will
ask if we can warm up while a negative DC voltage is applied to
the chips.


-------------------------------------------------------
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 
-------------------------------------------------------