Commissioning Notes from 12th-13th June 2008 MST
Observers: D. Miller, A. Rakich (in Tucson).
OSA: David G.-H., J. M. Hill
Software: T. Leibold, S. Hooper, N. Cushing, plus C. Biddick by phone
IRTC problems at start of the night, unresolved we moved on with guide camera only. Then problems with preset.
Various strange issues with offset to hotspot and guiding discussed in issuetraks 1445-7.
Successfully took WFS data at 4 off-axis datapoints, relatively painless, something of a milestone.
Seeing measured on guider images was 0.4 to 0.5 arcsec in red for the second half of the night.
Gave up at 4:15 when PMC and PSF crashed for some reason.
Night time Activities
(Times are in MST)
8:35 IRTC not starting, JH investigating. IRS server died and need reset. Issuetrak 1444.
Sky is photometric with light wind.
8:36 going to WT10298 to set pointing offset. GCS waiting for something, rotator not working for some reason.
8:38 resend preset with guide command.
8:50 identified a problem with CSQ. restarted. related to previous issuetrak according to Steve (1344).
8:59 had to restart everything on 101. sending new preset. Preset send failed "CSQ did not accept command "IIF preset"".
9:15 resend preset to WT10298
9:25 trying again...
Somewhere in here we moved CSQ to lbtmu103, and had to kill and restart irs. But, forgot to authorize IRTC through
IRS, so that was blocking the preset for a while.
9:47 found star, going to Pearson star for appropriate brightness for guide camera.
9:55 reoccurence of 1371/1406 issue. Kill and restart GCS
10:10 things seem to be working at last, had pointing offset of focusing.
10:25 collimated on BS9166, WFSC00004-8 for acto corrections, now checking vignetting at several off-axis field points
10:26 tried to go to #7 and stage didn't go far enough. two problems: 1) GCS is finding a star on the full chip, as it tries to fine tune that on a smaller box it can't find the star while off-axis, but this seems to work for the on-axis star. 2) Why, when we have an on-axis star on the hotspot, should we go to an offaxis star a few arc minutes away, and then be off the hotspot by ~10 mm?
11:26 go to BS9177 as BS9166 was getting to near zenith. Going to on-axis guiding first.
11:28 star acquired, guiding on axis (and star is in centre of guide box)
11:30 going off-axis leads to problems, finally identify a sign problem in the off-set to hotspot that affects things off-axis
1:04 many problems with guiding, rotator angle etc, see issuetraks, starting to take off-axis data with guiding switched off.
John was doing manual guiding by adjusting CA and IE by hand with ptmodify.
1:28 collimating on star 14. first sign of vignetting on top row WFSC00010-17 collimating with 13X13 array.
1:37 switching to 11X11 wfsc 000018-25, recollimate. Taking 5 WFS measurements at wfsc000026-30, then going on-axis.
1:58 on axis taking 5 images wfsc000031-35
2:07 go to star star#41, same vignetting of pupil that is hard to explain, recollimating wfsc 000036-41, taking 5 sets of data wfsc 42-46
2:16 going back on-axis and set of 5 measurements small lost time ~ 3 minutes as we reacquire guiding wfsc000042-47, taking set of 5 data (gone to on-axis guiding and the same problem as issuetrak 1447 reoccuring).
2:34 Given the time that has elapsed between measuremnt of star 41 we now have to repeat offaxis WFS data, while we're here on axis we're trying some experiments on hte effect of rotator angle on issue 1447. Changing hte rotator angle seemed to bring the behaviour back to good, but couldn't repeat the bad behaviour when we returned to starting point.
2:38 gone back to star 41 recollimating WFSC000053-55, now taking set of of five wfs data wfsc000056-60 going back on-axis
2:45 guiding on-axis working well wfsc 62-66 onaxis data
2:53 going to off-axis star #57, problem moving probe to requested position, Doug suggests OACserver problem, third send got there. Guiding and guiding works well. Rolled the primary of the +x limit with a 0-.5 mm global X offset and +10" global Ry offset. recollimate wfsc70-75 tasking set of 5 data wfsc 76-80.
3:10 going back on-axis GCS died unexpectedly (very) (3:15:54 am). Damn. Restarted GCS, set of five data wfsc 83-87
3:22 going to star# 32 guiding and not oscillating. collimating wfsc 87-94, taking dataset of 5 at wfsc95-99
3:35 going on axis taking set of 5 data: wfsc101-105. recollimating wfsc106-112
3:48 taking 5 sets at zero aberration wfsc113-117
3:53 taking 5 sets at +250 z11 wfsc 118-122, back to zero and recollimate wfsc123-129
4:06 taking set of 5 at +500 nm Z11 wfsc 130-134
4:10 going back to zero and recollimate wfsc 135-13
4:12 PMCL and PSFL crash brings our evening to an end.
4:20 Close dome
4:30 DGH is able to revive PMCL by multiple restartings of PSFL, LSS, CSQ and PMCL.
4:50 JMH and DGH are able to revive IRTC by jiggling USB cable to camera and cold booting the Windows PC.
5:16 GCS is still sending guide corrections to PCS. Hmmmmmm. Have we made it too robust? Sent it a stopGuiding
command to stop it.
[Note that guide filters azfilter and elfilter were both 0.5 for the entire night.]
[JMH figured out the next day that the guiding oscillations were caused by cos(EL) effects while we were crossing
the meridian at high elevation.]
- 13 Jun 2008