To:sot_shift
from: Dan Schwartz
date: 16 Jul 00, 9:00am EDT
Subject: SOT shift report 2000-07-16 L359
--------
See http://asc.harvard.edu/acis/SOT_reports/sot-shift.html, or 
/proj/ascwww/AXAF/extra/science/htdocs/acis/SOT_reports/Jul_16_2000_L359.txt.

Shift L359. 
	Start at 198:10:30  GMT
		 = 06:30 am    16 Jul EDT
	End	   09:00 am    16 Jul
   
SOT Lead	DAS
ACIS 		PPP

(Times will be given in GMT on day 198. In general
times are rough, not precise.)

PLAN
Assess radiation levels to see if we can activate the load JUL1600d to
restart Chandra observing.

Next Comms
	198:11:00 to 12:45
	198:20:45 to 22:45
	199:03:55 to 06:45 HETG insertion via daily load
	199:14:35 to 15:35 Last comm before JUL1700 starts observations
	199:23:40 to 00:40
	200:09:20 to 11:20


EVENTS
11:02 AOS
EPHIN RATES:
       EPHIN Geom             =       LARG
             E1300            =        235                LT 1318.52 (RADMON
             P4GM             =       6752                LT 3542.40  Triggers)
             P41GM            =         88                LT  100.00


Status at AOS, 198:11:02, was as follows:
       PCAD MODE              =       NPNT
       CONTROL LAW FLAG       =       NPNT
       Stars:                 =          5 
       FIDS                   =          0
       RA                     =    325.439 deg 
       DEC                    =     60.100 deg
       ROLL                   =    151.301 deg
       Format                 =          2
       OBSID                  =      61995 Position where load was
					   stopped on 196:21 GMT
       SIM FA                 =       -467
       SIM TSC                =     -99615 (HRC-S)
       HETG                   =        OUT (80.2 deg)
       LETG                   =        OUT (78.3 deg)
        HRC-S HV is ON 
        EPHIN:         A-Leak =  0.6280 mu-a
                       B-Leak =  0.1120 mu-a

11:30 Run SOP to warm boot ACIS BEP, and restart housekeeping. This is in
case ACIS had taken SEU hits in the enhanced radiation.

12:44 LOS: Status essentially unchanged.

NOTES/ISSUES/PROBLEMS
Our criteria for restarting loads were to have the EPHIN rates a
factor of ~3 below RADMON trigger levels, namely
	E1300 < 400
	P4GM  <1200 
	P41GM <  35
These were not met, and the loads were not restarted. SCS slots 128,
129, and 130 were cleared. 

Stars are being tracked, and images look good.

Plan: Load review at 10am EDT today, for restart plan B, aka JUL1700 load.
      Tagup telecon at 9pm EDT tonight to discuss radiation background
      Midnight EDT today will be grating insertion via SCS load
      9:30 am EDT Monday, telecon to assess radiation, final decision on
	letting the JUL1700 load proceed with science observations.

ACE proton fluxes are around 20,000 particles/cm2-s-ster-MeV, 130-214 keV.
Two full orbits at that rate, with HETG in place, gives about 1.7e+9
fluence. 


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