To:sot_shift
from: Dan Schwartz
date: 31 July 99, 0825 EDT
Subject: SOT shift report, Shift A9
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See http://asc.harvard.edu/acis/SOT_reports/sot-shift.html, or 
/proj/ascwww/AXAF/extra/science/htdocs/acis/SOT_reports/July_30_1999_B.txt.


Shift A9. 
	Start at 212:01:30  GMT
		 = 0930 pm 30 July 99
	End	    9:20am 31 July
   
SOT Lead	DAS
Spac/Aspect	WAP
FOT/Sci liason	EM
HRC		EJ 
ACIS 		PPP,RB,

(Times will be given in GMT on day 212. In general
times are rough, not precise.)

PLAN
Next SSR dump at 09:36 (Fill time would be 212:20:30).(DONE, later)
Finish Earth scan 14, IRU bias measurements, return to NSM. DONE
Perform CAP 117 for initial SIM activation. DONE
Turn on vacuum monitor and measure pressure. DONE
Perform ACIS internal cal source measurements. DONE
Start ACIS bias test measurements. (READY to start)
Perform CAP 109, Test 1a of flexure heating at 55 deg pitch. DONE
Do Diego data flow test. DONE
Do an IU load and dump. DONE


EVENTS
Run CAP 91A to reacquire fid lights, 01:30. Is successful.
Stop the science run at ~11:30

Change to OBSID 62766 at 11:38  for carrying out the Acis bias
data measurements.
Turn on vacuum monitor, 01:54. Starts reading at 1.16 x 10^-5 torr. 
Down to ~1.04 x 10^-5 at 02:45. Flattens at 1 x 10^-5 torr.

Format 2, 02:20 monitor ACIS focal plane, at -113.2 deg C.
At 04:20, focal plane at -117.6 deg C. 

Initial SIM activation at 02:35. The translation position 
is set to motor step 75620, and focus position at 172.

Start loads for ACIS internal cal source, 03:11.
We'll use the same three parameter blocks as on 
shift A8.
Change to OBSID 62771 for first measurement at 03:32.
Change to OBSID 62770 at 05:54. 
Change to OBSID 62769 at 08:28
Stop the science run at ~11:30

Change to OBSID 62766 at 12:22  for carrying out the Acis bias
data measurements.

LGA swap 1 to 2, 03:15. Successful. 

Start CAP 120, IU loads and dumps, 04:15.

Interrupt to use format 3 to dump IU load at 11:15.

Start roll maneuver for CAP 109 test 1a at 06:06. Pitching
at 06:20 and notice increased stray light, which is perturbing
the fid light positions. At 55 degrees pitch, we continue to 
track all 4 fid lights. Note that the -10deg roll must have 
helped, since previously at 55 deg pitch we have lost all 
fid lights into the increased background.

NOTES/ISSUES/PROBLEMS
Develop a flight note #145, CAP and SAP, to study the fid light loss.
This basically sets three of the fid lights much fainter, to magnitude
about 8, 9, and 10, to see if this causes a higher rate of
track loss. Presumably, cosmic ray hits WOULD have a greater 
effect as the signal from the lights decrease. Most of our
stars of course will be of magnitude 9 or 10, and we expect 
to need to go down to 11th mag occasionally.
Flight note 142 detailed the observations of the ACA loss of
track events.

Interrupted ACIS format 2 to insert some brief (~5 min)
format 3 for dumping the IU loads.  This should provide an
interesting test for the CXCDS in the reconstruction of 
ACIS data which has been stored in their event buffer
and downlinked in later telemetry.

CAP 109 test monitored the SIM flexure C temperature when
tilted 55 deg from the sun. It continuous warmed up, looking
as if it might reach equilibrium around +22.2 degC.

Did not succeed recovering telemetry from Diego station

Planned power outage is causing problems with elevator access.
Call Tom Riley at 617 592 6005, or the draper guard at 258
4505.


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