Date: Thu, 2 Nov 2000 05:47:50 -0700 From: Dan Long Subject: 2.5m obslog 20001101 (MJD 51850) APACHE POINT OBSERVATORY SDSS 2.5M OBSERVING LOG Wednesday November 1, 2000 (MJD 51850) OBSERVING TEAM: =============== Dan Long (APO) Mike Harvanek (APO) Pete Newman (APO) Eric Peng (JHU) PT Heather Rave (RPI) PT VISITORS: ========= Bill Boroski (FNAL) Larry Carey (UW) Russell Owen (UW) THE PLAN: ========= Collimation and pointing model, and general first night back on sky engineering. SYNOPSIS: ========= Shook out several bugs, solved some. I continue to be amazed at how the telescope can be dismantled an reassembled, and yet have a star show up in the middle of the field in decent collimation and using a pointing model from before the work started. GENERAL COMMENTS (see Problems below for details): ================================================== After heroic efforts by French et al during the day to get the telescope back together enough to run with the EC tonight, we opened at around 19:30. There were a few small problems opening up. First we noticed that the PMSS pressure alarm LED was lit, but that the alarm bell was defeated. The pressure was near the low end of the range, but adjusting it to be anywhere in the range didn't cause the alarm LED to go out. Second, when we brought the telescope down in order to move the building off, the 15 degree stop would not retract. One could tell from the sounds of moving air that it was trying to move, but just couldn't. It was noticed that the cylinder was bent down with respect to the rod which moved the wedge. When the cylinder was bent back up, the stop resumed working normally, but it should be looked at for any permanent damage. Third, there was a brief scraping sound when rolling the building off. It was traced to a piece of metal associated with the new table/ corrector house which is just low enough to scrape along the door jam right next to the rail. We had no trouble firing up the EC and we got a star in the field on the first try, so things went back together amazingly close to how they were in the last run. A short time later we realized we weren't communicating with the secondary any more. The behavior was very similar to what we had seen earlier with the driver chips failing. As it was fairly quick to swap them, we did. Sadly it didn't fix it. A fair amount of debugging was done by all ( much thanks to Russell and Craig ), and the culprit was determined to be the fiber transceiver at the M2 galil. When that was swapped with a spare ( internal dip switches set to ON, ON, ON, OFF for 1-4 respectively ), we were again able to talk to the secondary. We focused and went to check the MIGs in preparation for collimation, and found that the primary MIGs read all zeros. Rebooting the MIGs did not help. A check of the inspection hatch in the PSS showed all but the lateral MIGs were missing, and those were not plugged in. We plugged in E, but couldn't find the small black box for the F MIG. We looked around and found MIGs A through D in the trailer, apparently as part of an upgrade in progress, but not yet installed. A conversation with French later revealed that the new MIGs are due to go in first thing in the morning. We then noticed that when the telescope was below about 40 degrees in elevation at the EC focus value of about -2350, the secondary started complaining about SecDesMountOutOfRange="FFFTF". It appears that the known issue of being close to one end of the range on the transverse actuators, is actually too close when the focus is significantly negative. Most of the requested transverse galil positions were in the -16000 to -18000 range at 40 deg elevation, and the limit is -18000. This will likely require adjusting the spider rods and recollimating the secondary ( sorry guys ). We spent some time after this running through the collimation procedure for the benefit of the new observers, knowing that the values obtained would not really be useful. It was however good practice, and a reassuring test that the primary mirror controller was doing as requested. In the end, the original primary values were restored. The engineering camera was left on the telescope, but with all cables disconnected. This was done to keep the telescope from being badly out of balance ( it is in balance with the EC on *and* the weights all the way down ), but to make it simple to remove when necessary during the day. DATA ACQUISITION (see IOP/SOP output below): =========================================== IMAGING: -------- Run Type --- ---- SPECTROSCOPY: ------------- Frame Exposure (sec) Flavor/comments ----- -------------- --------------- OFFSETS: Cart Plate getclock Calib offsets Scale factor time Az El TAPES: Goes: Stays: MIRROR NUMBERS ============== PRIMARY: -------- MIGS TONIGHT SHOULD BE Axial A: ? 1.9300? Axial B: ? 0.5580? Axial C: ? 0.5555? Trans D: ? 0.3940? Lateral E: 1.9130 1.9150? Lateral F: 0.4055 0.4160? GALILS Commanded: 5127., -2930., 404., -3454., 10576., 10124. Actual: 5150., -2950., 400., -3450., 10600., 10100. SETMIR VALUES primDesOrient: 0.00, -8.00, 11.70, 640.50, 439.70 primOrient: 0.00, -8.36, 11.84, 640.32, 439.52 SECONDARY: ---------- Focus: -2350 Temp: -1.5 Altitude: 37.0 MIGS Axial A: Axial B: Axial C: Trans D: GALILS Commanded: SecDesMountOutOfRange="FFFTF" Actual: SecDesMountOutOfRange="FFFTF" SETMIR VALUES secDesOrient: -2514.04, 0.00, 0.00, 0.00, 286.70 secOrient: SecDesMountOutOfRange="FFFTF" FOCUS LOG: ========== M1 Piston M2 Piston Temp Wind Time Inst setmir TCC setmir Az Alt C Dir MPH filt FWHM " 23:40 Engcam 0 -2350 -2578 118 53.1 -1.4 222 7 - 1.8 (no spec corr.) WEATHER SYNOPSIS ================ It was a chilly clear night tonight. WEATHER DATA: ============= Wind Time Temp F Dewp F MPH Direction Dust DIMM Sky 16:01 33 14 8 342 (NNW) 140 - Clear 17:01 32 13 9 1 (N) 113 - Clear 18:01 32 13 16 342 (NNW) 89 - Clear 19:01 30 18 7 18 (NNE) 161 - Clear 20:01 30 17 5 6 (N) 130 - Clear 21:01 30 16 7 4 (N) 136 - Clear 22:01 31 16 3 353 (N) 125 - Clear 23:01 34 12 5 267 (W) 103 - Clear 00:01 31 14 5 265 (W) 109 - Clear 01:01 30 14 6 216 (SW) 113 - Clear 02:01 31 11 5 240 (WSW) 88 - Clear 03:01 30 12 3 263 (W) 115 - Clear 04:01 31 3 8 277 (W) 68 - Clear 05:01 31 7 8 284 (WNW) 76 - Clear LN2 SCHEDULE: ============= Spectrographs were filled at --:-- 05:30 Dewar wt --- lb Imager dewar changed during the day. 05:30 Dewar wt 87 lb TELESCOPE STATUS: ================= Stowed at 30 deg alt, engineering camera installed. INTERLOCKS: =========== none bypassed SOFTWARE USED: ============== IOP/SOP: v3_19_1 Watcher: v2_8_6 MCP: v4_3_9 TPM: v2_1_2 AstroDa: 14_34 TCC: 2.4.1b1 PROBLEMS IN DETAIL: =================== DATA LOGS FROM IOP/SOP: =======================