May_10_2000_L292.txt Shift L292 Start at 2000:131:12:10 GMT = 2000 May 10 08:10am EST End 12:00pm EST See http://asc.harvard.edu/acis/SOT_reports/sot-shift.html, or /proj/ascwww/AXAF/extra/science/htdocs/acis/SOT_reports/May_10_2000_L292.txt SOT Lead Ed Kellogg SOT-SI SOT SC/ACA FOT-SI HRC-SI ACIS-SI OTHER Plan: - OBSID 00909, ZW 3146 2000:131:03:42, ACIS-I NONE then OBSID 00630, NGC 6543 2000:131:17:14, ACIS-S NONE EVENTS DONE OBSID -------------- ---- ----- AOS, 3 fids, 5 stars 1500 909 Notes from 9 am meeting ------------------------ Ops: 2 dumps, 3 loads, good 'till 134:17:31, 4 CAPs - CAP603 PCAD autoconfigure CAP602 HETG tests CAP329 momentum unload CAP70 enable RADMON Mission planning: * Load review yesterday, MAY0700 approved & uplinked * looking at the impact of running on B side of MCE - the grating commands generated by OFLS go to the OBC and don't refer to A or B side. * the next HETG observation is on Thurs. 18 May, OBSID 1706. * there is a meeting at 2 pm to review the HETG test and prepare for B-side operation next week. B-side checkout will be done with existing approved procedures. Spacecraft eng'ng: ran the HETG retraction tests on A and B motor control electronics (see appended email from Jeff Shirer). The bottom line is that the B retraction indicator switch works fine; the A switch doesn't. SOT Lead: * The SOT worked with the FOT in an excellent effort to test the HETG retraction last night! * The proton flux is low and decreasing. * Computer processes such as snapshot that depend on remus are still inoperative. ASCDS: still no QL processing; due to very hard work by Lisa and Dan, four disks were replaced on the remus server, but the problem is not yet fixed. We are frustrated because we have still not been able to process the last observation with HETG in. CXC MGR: IUS mgr visits today at 9:30 am. Data ---- On colossus at 1241 GMT.(/dsops/GOT/input), - May 10 09:18 2000_130_2301_131_0849_Dump_EM_59320.gz Evaluation of QL data --------------------- The following observations should be available for review. If there is no comment after the entry, it means that there is no record of ascdsops QL processing. If it has been reviewed by SOT Lead, a review evaluation comment is given. If it is in the ascsdops record but not listed as QL processed, the ascdsops comment is given. OBSID Target Time SI SOT Eval. ascdsops comment ----- ------ ----------- -- ------- ----------------- 00507 RX J1347-114 2000:120:10:46 ACIS-S NONE 00444 E0102-72.3,CHIP S3 2000:121:08:40 ACIS-I NONE 00927 CL 0848.6+4453 2000:125:14:50 ACIS-I NONE 00834 NGC 4261 2000:127:02:02 ACIS-S NONE 00380 M82 2000:127:12:17 ACIS-I NONE 00735 SN 1993J 2000:128:05:34 ACIS-S NONE 00906 ABELL 1995 2000:128:19:55 ACIS-S NONE 00927 CL 0848.6+4453 2000:125:15:10 ACIS-I NONE 00834 NGC 4261 2000:127:02:49 ACIS-S NONE 49899 PROXIMA CENTAURI 2000:128:22:53 ACIS-S HETG 00906 ABELL 1995 2000:129:08:23 ACIS-S NONE 00682 XTE J1550-564 2000:129:23:0 ACIS-S HETG 00641 PROXIMA CENTAURI 2000:130:00:0 ACIS-S HETG At this point the load was stopped because of the HETG anomaly 00909 ZW 3146 2000:131:03:42 ACIS-I NONE NOTES/ISSUES/PROBLEMS --------------------- ACE 2 hr fluence is 5.5e5 vs. threshold 3.6e8. Orbital fluence is 6.4e6 vs. threshold 1.0e9 ACIS focal plane temperature is -119.9 at 15:10 GMT The MAY0700b load was stopped by CAP 601 at 130:11:34, after OBSID 00641, PROXIMA CENTAURI. The new load, MAY1000, started at OBSID 00909, ZW 3146 2000:131:03:42, ACIS-I NONE. Chandra's state was: --------------------- UTC 2000:131:15:07:01 (Wed May 10) f_ACE 7.19e+01 F_ACE 6.35e+06 R km 139852A OBT 2000:131:15:06:36 CTUVCDU 11059666 OBC s/w NRML FMT2_SSR CPEstat OBT 74358396.97 ONLVCDU 11059656 OBC Errs 0 OBSID 909 EPState SUN SIM TTpos 89999 HETG Angle 80.6 PCADMODE NPNT RA 155.901 Bus V 30.87 SIM FApos -535 LETG Angle 79.1 PCONTROL NPNT Dec 4.192 Bus I 30.77 AOFSTAR GUID Roll 250.237 ACA Object FFFSSSSS Dither ENAB HRC-I HV OFF ACA ImFunc TTTTTTTT Dith Yang 7.92 Yaw Rate 0.19 HRC-S HV ON ACA CCD Temp -10.4 Dith Zang -2.03 Pitch Rate 0.10 OBSMode NEXT ACA Int Time 1.698 Roll Rate 0.08 Door OP UNAC AOACSTAT OK FSS SunBeta SUN Door CL UNAC FSS Alfa -0.37 Batt 1 SOC 100.00% Avg HRMA Temp 70.58 FSS Beta -16.08 Batt 2 SOC 100.00% ACIS Stat7-0 65 Avg OBA Temp 50.89 SA Resolv 106.45 Batt 3 SOC 100.00% Cold Rad -127.9 OBA Tavg Fault NFLT SA Sun Pres ILLM Warm Rad -82.0 OBA Trng Fault NFLT +Y SA Amps 14.30 HRMA power 105.20 -Y SA Amps 15.46 EPHIN Geom LARG OBA power 125.00 +Y SA Temp 110.20 E1300 5 -Y SA Temp 109.89 P4GM 0 Roll Mom. -3.900 SCS 128 P41GM 0 Pitch Mom. -5.835 SCS 129 UpL Cmd Acc 11295 A-Leak 0.4840 Yaw Mom. 1.726 SCS 130 Cmd Rej A 47 B-Leak 0.0760 Jeff Shirer's note on the HETG test: ------------------------------------ Subject: HETG Experiment Results - 5-9-00 Date: Tue, 9 May 2000 20:48:48 -0400 In support of the ongoing HETG anomaly investigation, CAPS #602 and #603 were executed beginning at GMT 130:22:36 (5-9-00, 6:36 p.m. EDT). The objective of the experiments was to determine if insertions and retractions of the HETG using MCE-B would give different results than the observed behavior of MCE-A. In summary, CAP #602 used command loads to perform the following actions: 1. Insert HETG with MCE-B for 4 seconds. 2. Retract HETG with MCE-B for 6 seconds. 3. Insert HETG with MCE-A for 4 seconds. 4. Retract HETG with MCE-B for 6 seconds. The angle potentiometer readings following each step were: MCE-A MCE-B Start 80.6 81.0 Step 1. 79.5 79.8 Step 2. 80.6 81.0 Step 3. 79.5 79.8 Step 4. 80.6 81.0 Throughout all steps, the A-side limit switch read "NRET"(Not RETracted) for the HETG status. The B-side limit switch changed as appropriate between "NRET" and "RETR." On both retractions, there were no signs of the attitude or HETG angle "bouncing" that were seen when using MCE-A in previous retractions. Furthermore, the retractions did not result in a increase of the back-EMF from the HETG drive motor, as was seen in the recent MCE-A retractions. The successful insertions and retractions decrease the possibility for a mechanical blockage or problem with the drive motor or the associated electronics. The lack of bouncing or back-EMF indicate that the HETG retraction was being stopped correctly by the B-side limit switch before reaching the bumper spring at the end-of-travel. It is hypothesized that the HETG bouncing seen on MCE-A retractions is the result of contact with the bumper spring caused by the A-side limit switch not tripping and allowing the HETG to be rotated past the normal stopping point. In the debrief the team agreed that the next logical step is to fully check out B-side operation by performing full insertions and retractions with MCE-B, using both hardware and software commands. A telecon is scheduled for 2:00 p.m. EDT on 5-10-00 on the call in line: 918-222-7065, pin 1165#. Time summary of events in GMT: CAP #603 (Steps 1-3) 130:22:26 Uplink Dead-Man SCS #239 130:22:30 Enable and activate #239 (90 minute timer) CAP #602 130:22:36 Command NMM 130:22:38 Disable Auto momentum unloading 130:22:39 Disable S/C Momentum monitor 130:22:40 Uplink insert and retract command loads 130:22:45 Enable MCE-A 5v power 130:22:46 Enable MCE-B 5v power 130:22:48 Insert HETG with MCE-B 130:22:50 Retract HETG with MCE-B 130:22:51 Insert HETG with MCE-A 130:22:52 Retract HETG with MCE-B 130:22:58 Disable MCE-A 5v power 130:22:59 Disable MCE-B 5v power 130:23:00 Clear out mission command loads 130:23:01 Enable S/C Momentum Monitor 130:23:03 Enable Auto momentum unloading 130:23:04 Activate SCS #38 130:23:05 Command NPM CAP #603 (Steps 4,5) 130:23:06 Disable SCS #239 In addition, it was observed by PCAD and ACA that the S/C momentum values were relatively high, and that RADMON was disabled when it should be enabled. Both states were caused by lack of continuity between the terminations of the MAY0700 loads and the start of the MAY1000 loads. Momentum was unloaded with CAP #329 at 23:17 and RADMON was enabled with CAP #70 at 23:19. ********************************************* Jeff Shirer Flight Operations Team TRW, Inc. Chandra X-Ray Observatory Cambridge, MA 617.496.7227 ph 617.496.7049 fax 800.672.4885 pager jshirer@cfa.harvard.edu *********************************************