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Dan Kelson's night. He had a set of setup stars that more or less included a line across the center of the field. The ialign setup routines showed a scale change that may or may not be enough to cause problems with ADC masks.
After doing an initial non-adc setup with IMACS, we gave the telescope to Skip for S-H setup. He wanted to use the LED lamp but it took a long time to find it (it was on the bookshelf). In the end, we decided not to do this since replacing the guider pickoff mirror was a difficult operation since it has to be shimmed at night. So we found an old LED template and used it (this will have to be done right next month).
We then had trouble with IMACS hitting its earthquake stop on the rear rotation disk. Apparently, removing the primary mirror cell with IMACS attached caused IMACS to drag a bit towards the elevation disk. This caused the rear roller ring to rub against a brass stop, creating enough friction to keep IMACS from turning when the telescope moved in elevation (dragging the rotator capstan). This was discovered later after checking the rotator system (Pato Jones and Frank were both called up at night).
Anyway, the multiple problems prevented any of the planned IMACS observations, except a few pictures with the S-H system running on the centerfield guider.
Frank collimated the secondary mirror; got an incomplete set of numbers because the autocollimator frame moved in the Cass hole. A solution was computed and put into the config file and verified.
Moved to PANIC port and adjusted the tertiary mirror. It was initially way off because a scale change in an ini file put one of the actuators the limit. In the process of finding this out, Charlie noted the output of the LVDTs on the tertiary were erratic and/or noisy.
One elevation run was done and checked on the way back and looked repeatable.
We turned the ADC lens into the beam for fun. Putting the lenses at the no-dispersion correction position showed a slight offset of the autocollimation beam and x-mark on the secondary, suggesting that the ADC lenses were not at the correct rotational position (but it wasn't off much). We won't worry about this at the PANIC port but will want to do this carefully at the IMACS port. Charlie says adjusting the detent position won't be much of a problem, if it's needed.
We decided to tip/tilt the primary with M3 tilts applied. This was done at the begining of the night (0.5 arc second images on the guider in R).
Tomorrow we'll do the M3 tilts for IMACS.
There are two corrector lenses. Each lens has a stepper motor that turns it. We need to be able to find the home position for each lens and turn each lens a specific number of steps.
In the beginning, the software should be able to do the following:
