Aug_08_1999_H.txt Shift H18 (A18) Start at 1999:221:02:00:00 GMT = 1999 Aug 8 10:00pm EDT End 1999 Aug 9 6:00am EDT See http://asc.harvard.edu/acis/SOT_reports/sot-shift.html, or /proj/ascwww/AXAF/extra/science/htdocs/acis/SOT_reports/Aug_08_1999_H.txt. SOT Lead Ed Kellogg SOT SC/ACA Tom Aldcroft FOT-SI Andy Northrup HRC-SI Jerry Austin ACIS-SI Ellen Sen, Paul Plucinsky (Times will be given in GMT on day 221. not precise.) EVENTS PLAN DONE OBSID -------------- ---- ---- ----- Start shift (10pm EDT 08 Aug 1999) 0200 0200 62747 Continue monitoring ACA fidlites ongo ACIS cooldown ongo Open HRC door, CAP 190 0343 0417 End shift (6am EDT 09 Aug) day 221 1000 Maneuvers: yaw, then pitch to 106.2 for ACA fidlite characterization 1000 ACA fidlite characterization SAP 6A008 1030 NOTES/ISSUES/PROBLEMS --------------------- At M-to-H shift change, 218:0200, Chandra was 7.5 hrs past radiation, 31 hrs to apogee. ACA was monitoring four fidlites in the correct window. HRC was on, low voltage power only, EPHIN was nominal, and ACIS was cooling down after a successful door opening. The fidlite stability patch for the PEA's, designed to cure the problem of ACA loss of fidlites, has not yet reached TRW. SOT should contact Ball on Monday for progress of patch development. Ball has built a patch and turned it over for test (no work on the weekend). Since the SMF goes to a "days-only" stance on Tuesday (Aug 10) it is critical for Ball to turn the patch over to the SMF ASAP. (BALL contact: Dan Michaels - pager 1-888-788-0344). 221:0415 ACIS focal plane is -19.6 C, and detector housing is -30 C. 0417 HRC opened their door, since they felt the danger of contamination from ACIS outgassing, reaching 5e-5 torr at 220:16.5, had passed, since the pressure was back down to the level seen prior to ACIS bakeout, 8e-6 torr. 0937 ACIS focal plane temp is -53.2 C and detector housing is -50 C. At this point the focal plane cooler is being driven toward -90 C.