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| 04MayLCO |
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ADC was installed and the primary mirror was back in the telescope when I arrived.
The ADC turrent didn't turn when commanded last month during a test in preparation for the AEDC. Charlie found that the turrent motors (5-phase steppers) were wired incorrectly and consequently produced less torque than they should've. This was fixed and the ADC turrent motion worked.
Silvia Baeza reported that there were 45000 steps per 360 degree revolution in the ADC lenses. That's 125 steps per degree. The home position for both lenses is along the optical axis and when both lenses are at home there is no dispersion, that is, the lenses are set for zenith pointing. Silvia has the display readouts to show the home position ("0 degrees") but there is no display for the angle yet.
Frank collimated the secondary. A new secondary flexure model was generated from Matt's spreadsheet and loaded into the fcfg file and tested (OK).
Frank then did a tertiary alignment at the PANIC port and also looked at the tertiary flexure vs. elevation. A small problem was noted (the mirror was way off at first). This was traced to a scale change that Silvia made in a .ini file. This was corrected and the mirror moved correctly. In the process, however, Charlie noted that the outputs of the LVDTs on the tertiary actuators was erratic. (Is this a problem?) The tertiary tip/tilt at zenith was found. One partial run from zenith down was done, but the numbers repeated on re-examination on return to the zenith so we used them to tilt the tertiary for nighttime testing.
That night, the primary mirror was tipped and tilted (to equalize the coma term in the S-H analyzer) and new numbers were installed in the vectors.txt file.
The next night Skip prepared some new S-H templates and found new offsets for the guiders, pupil positions, etc. This will have to be done again in the next engineering run. There were some numbers that were different from before and we didn't do an LED template because it would've taken a bit too much time with the possibility of getting little done. We risked running with an old LED template. Again, this will have to be done next time. (It also took a bit of time to find te LED light system). The LED installation is probably easy but requires removing the pickoff mirror on one of the guiders. Putting on the mirror again is difficult since it needs to be shimmed to the correct position.
Maybe Tyson can build a new pickoff system that doesn't require adjustment.
Mauricio and Patricio Jones helped me examine LDSS. It looks like a pinned steel ring would do well for the spacer. There's lots of room inside, at least at the front end. Mauricio noted the problem with the wheel sensor and pointed out the locations of the reflective marks.
See notes in the LDSS section where I described some measurements in detail.
A new blue side CCD was installed in MIKE (much better QE <4000A) and new wing chips were installed in IMACS.
Alex and Steve tested a GLAO camera at the LDSS port. The plate wasn't drilled exactly right so only one star at a time was possible.
Ben Lane got tip/tilt working on the Clay secondary. The results were ambiguous as Steve predicted. Images < 0.5 arc seconds on MagIC were recorded with the system running.
