040427

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Engineering video conference

Apr 27, 2004, 11:00 AM PDT

Attending: Skip Schaller (by phone from Tucson), A. Uomoto, A. Dressler, T. Hare, I. Thompson, C. Hull (SBS), D. Osip, F. Perez (LCO).

Contents

1. Agenda
2. IMACS discussion
3. Scheduling CCD work
4. ADC lens condition
5. Turrent rotation
6. Installation plan
7. Active optics
8. Astrometry

1. Agenda

Pre-agenda:

Dressler to confer with Osip about IMACS at 10:45 AM PDT

• Status of ADC turrent rotation (does it? Frank)
• Installation plan and schedule (Charlie and Frank)
• Active optics preparation (Skip)
• Astrometric fields (Mark or AU)

2. IMACS discussion

Some discussion about IMACS problems occurred at the beginning of the meeting, following a telephone conversation between Dressler and Osip that morning.

There was a question about a support for the F/2 filter server to reduce flexure.

Need HW for IMACS purge air (dewar window iced over recently). They want an AIRCO regulator and flow control for a N2 tank.

3. Scheduling CCD work

Ian reports that he will install the wing chips in IMACS. David Osip will remove the IMACS dewar and let it warm tomorrow. Ian and Greg will work on the dewar starting 5/5/04 and hopefully have it ready by May 8, 2004, when the telescope will be collimated and ready for nighttime observing. May 8 and 9 are available for nighttime work.

There was some discussion later about MIKE CCD head exchange as well.

4. ADC lens condition

Boxes arrived at LCO and Frank noted that they looked OK and the lenses were packed in a vapor seal. Charlie suggested cutting the plastic seal to let dry air in and to look at the lenses.

After the meeting Frank reported some spots on the lenses and sent photos. Charlie looked at the photos and thought they might have looked that way at Brashear. Charlie will examine them at the observatory and decide whether or not they should be cleaned.

5. Turrent rotation

Frank says he will install the alternate pulleys and belts to get the ADC turrent to turn. The turrent can be moved by hand so there is no danger of being stuck in one position.

6. Installation plan

Charlie will start on the first day (Sunday) to work on installing the ADC. M1 and M3 come out on Sunday; M3 goes to the non-rotating floor. Monday: M1 and M3 are washed, new pulleys and belts installed. Monday and Tuesday: ADC installation (or cleaning and then installation). Wednesday: Reassemble telescope. Thursday and Friday: Collimate. Saturday and Sunday: On-sky testing.

7. Active optics

Skip reviewed the steps needed to get the active optics working with the ADC. He verifies it can be done in a night.

8. Astrometry

This topic was deferred.