From: ank@apo.nmsu.edu Subject: 2.5m obslog 20001217 (MJD 51896) Date: Mon, 18 Dec 2000 06:24:54 -0700 (MST) [mail to: obs-report-25m@apo.nmsu.edu include MJD in subject] Sunday Dec 17 2000 Apache Point Observatory SDSS 2.5m Observing Log (MJD 51896) OBSERVING TEAM: =============== Atsuko Nitta Kleinman (APO) Pete Newman (APO) Steph Snedden (APO) PT and 2.5m Alan Uomoto (JHU) PT VISITORS: ========= French Leger (FNAL/APO) returned in lightening speed from Santa Fe to work on M1. we also woke him up when M1 oscillated. Jim Gunn (PU) via phone THE PLAN: ========= If mirror is fixed, then collimate it. Science if possible after mirror is in order. SYNOPSIS FOR NIGHT: =================== After painfully checking the collimation of the mirror, M1 oscillated. After we got this under control and checked the pointing, the wind became too high and we closed. We accomplished nothing. TELESCOPE STATUS: ================= Opened: 19:30 Closed: 02:00 DIMM: ===== INTERLOCKS: =========== none bypassed SOFTWARE USED: ============== IOP/SOP: v3_23_2 Watcher: v2_8_9 MCP: v4_3_10 TPM: v2_1_6 AstroDa: 14_34 TCC: 2.4.1 WEATHER SYNOPSIS (see below for hourly data): ============================================= Clear with sometime high thin clouds. Became very windy and cold. GENERAL COMMENTS (see Problems below for details): ================================================== When we woke up, French was working on M1. We checked the imager and it was already cold. The vdd voltages suggested that no "setvddnom" was issued. So we issued it and iacked. French found the mirror was against the stop on one side. There was no air going to the bellows which moves the mirror in transverse. After replacing a valve that moves in the air in and out of the bellows, the mirror was able to move in transverse again. We then looked at the the camera chiller power supply in the lower enclosure showed Volt=0 (instead of 24) and Current=0 (instead of 21). We believe this is something that was forgotten to be set after the warming/cooling of the imager or when Jon B. connected a temperature sensor unions to the glycol hoses on Friday. A quick phone call to Jim G. and we found out that as long as we have the current set at the correct number, we do not have to worry about the volt. When fiducializing, we are still using the AZ fiducial around 135:45 instead of the canonical 120:45 because we could not get the position better than 2" using the canonical one. We put the engineering camera on the telescope so that we can check the collimation and the pointing. We first homed and relaxed M1. Comparing the MIGS, we found B,D, E, F to be off from nominal values. We expected D to be off, but not B, E, F. We don't know why B, E, F changed its position, but we decided to focus on D. We know from the night logs where D MIGS was before we had problem. We then had to find out how much we are off now in MIGS and tried to bring it to where it was. Then we took an image of a bright star, and saw a donut that showed we were not too terribly off collimation. We wrote the mirror values into a new file so that we can use these as our collimated mirror values for tonight. (Doing all this was quite a challenge for us since we are not fluent in TCC language. We also had a problem with the editor which did a wacky thing.) We then changed our focus so that we can see the in-focus image. In the process we found out that M1 as oscillating. The star's 1s integration image looked like a ring. When we checked the air pressure gauge in the lower enclosure, the gauge showed the pressure was vibrating. We woke French up for help. French asked us to tweak the pressure proportional potentiometer until the oscillation stopped. We were warned that if we moved the telescope to different position, we could have another oscillation event. So we should keep an eye on things. The way we tweaked to get the oscillation under control raised some safety issues among us (Steph, Pete and Atsuko). Please see the "Safety section" for more info. French will calibrated the potentiometer so that M1 will not oscillate regardless of the position tomorrow during the day time. Once the oscillation was under control, we then went to another star to check the pointing and to see if we will see another oscillation. The pointing was about 45" off, but no oscillation. We saved the offset sticky. We then decided to try to get a FK5 star close to a plate we would be observing. If we can get the offset, then we would have better chance of finding our guide stars. We slewed to a fk5 star near the field of cart 6 plate 466 and did find a star on the camera. We centered it and made offset sticky. We were then going to do one more pointing check when the wind became too big (gust over 40m/h) and we were forced to closed. We saved the eng gam images for Jim in case he is curious. /data/scratch/ank/gimg0017.fits --> out of focus donut /data/scratch/ank/gimg0024.fits --> mirror oscillation causing the star to look like a ring /data/scratch/ank/gimg0040.fits --> after we got the mirror under control. French will have the mirror in the mechanically collimated position tomorrow. We will have to do another collimation and then a pointing model before we can do science. "M2 Force Limit" error message still showed up from time to time. Also the M2 MIG C is still not reading any numbers. endNight -doTpm ran successfully. While putting the telescope to bed, we noticed that the chiller power for imager again had volt=0, current=0. Since we did set current=21 before opening tonight, we think there might be something wrong with the system. A PR was filed. We power cycled and set current=21, which brought the volt=20. (To set the current, we turned the power off, lowered both dials to zero powered on, set the current dial to max and then slower raised the volt dial. The instruction hanging on the side of the panel said to raise the volt and then the current -- opposite of what we had to do.) DATA ACQUISITION (see IOP/SOP output below): =========================================== IMAGING: -------- Run Type --- ---- 1982 bias SPECTROSCOPY: ------------- Exposure Type -------- ---- 7625 init bias MIRRORS: ======== PRIMARY: -------- MIGS SHOULD BE Axial A=0.0399 0.0150 Axial B=-0.0619 -0.0510 Axial C=0.0230 0.0300 Transverse D=3.9609 0.2350 Lateral E=1.9079 1.9100 Lateral F=0.4090 0.4095 GALILS Commanded:4903.,-2750.,447.,-3399.,8732.,8317 Actual: 4900., -2750., 450., -3400., 8750., 8300 SETMIR VALUES primDesOrient:0.00, -4.60, 10.50, 586.50, 447.10 primOrient:0.00, -4.56, 10.53, 586.48, 447.09 SECONDARY: ---------- Focus:50 Temp:-2.7 Altitude:65.82 MIGS Axial A=2.2290 Axial B=2.2990 Axial C=0.0000 --> gauge is still not fixed Transverse D=0.2249 GALILS Commanded:2910013.,-2910013.,-2910013.,10096.,11296 Actual: -2909982., -2909976., -2909976., 10100., 11300. SETMIR VALUES secDesOrient:-2310.43, 0.00, 0.00, 0.00, -318.70 secOrient:-2310.40, 0.00, 0.00, 0.00, -318.78 FOCUS LOG: ========== M1 Piston M2 Piston Temp Wind Time Inst setmir TCC setmir Az Alt C Dir MPH filt FWHM " (rel) (abs) Safety ======= While tweaking the potentiometer, Pete was in the lower enclosure looking at the PMSS pressure gauge, Atsuko was at the electronic box tweaking the potentiometer, Steph was taking gcam image to see how better/worse the oscillation was in finer detail. We found out that the PMSS pressure gauges can only tell us big oscillation movement. We could only see smaller oscillation by taking images. But in order to take images, we had to leave the telescope tracking. This meant Atsuko under the telescope tweaking the potentiometer and Pete looking at gauges in the lower enclosure WITHOUT the stop button in. Doing electronic work so close to the telescope without the stop button in reach is not a safe way to work. We would have liked to have a stop button on a pendant that we can have with us so that in a circumstance like this. That way, if we see we were in danger, we could hit the button without having to run to the stop button. LN2 SCHEDULE: ============= spectro@60 autofill connected imager@76 PROBLEMS: ========= WEATHER DATA: ============= Wind Time Temp F Dewp F MPH Direction Dust DIMM Sky Precip. 17:01 42 2 14 312 (NW) 95 clr 18:01 41 3 7 322 (NW) 89 clr 19:01 40 4 13 296 (WNW) 95 clr 20:01 40 5 15 284 (WNW) 161 clr 21:01 40 6 17 270 (W) 169 clr 22:01 41 6 18 291 (WNW) 112 clr 23:01 40 6 11 282 (WNW) 127 clr 00:01 36 5 17 318 (NW) 218 clr 01:01 29 6 26 18 (NNE) 470 clr 02:01 27 6 26 11 (N) 415 clr 03:01 24 0 15 1 (N) 304 clr 04:01 22 -12 22 359 (N) 225 clr 05:01 20 -24 16 32 (NNE) 82 clr [pmt]cl = partly, mostly, totally cloudy DATA LOGS FROM IOP/SOP: =======================