DEIMOS Team Meeting

6-22-00

Attendees:     Dave Cowley, Vernon Wallace, Heather Mietz, Carol Harper, Jack Osborne, Matt Radovan, Dave Hilyard, Barry Alcott, Kirk Gilmore, Bob Kibrick, Ken Dietsch, Terry Mast and Sandy Faber

·         July 6^th, 2000, 10:30 a.m.

·         The SSC meeting is on July 13^th. A DEIMOS report will be presented.

2.    Detector/ Mosaic 

Science Mosaic:

·         Kirk installed the science mosaic on the backplane. The shim for CCD #1 was modified, installed, and looks good. The 2K side is not aligned yet.

·         We need to think about safety issues surrounding the backplane, as there is 1 stand per 2 backplanes.  Currently the other backplane is on a microscope stand and is covered. Per Sandy, it should be clamped down and perhaps put in a box.

·         Science array flatness is at 5.4m without CCD #7.  CCD #7 has tilt, and with it included, the science array flatness is at 9.2m.

·         Summary of Kirk’s zeolite/charcoal tests:

1.      Cold zeolite (-160° C) is better at pumping water by a factor of 2-3 times more.

2.      Warm charcoal and warm zeolite pump the same.

3.      Warm charcoal and zeolite are better than nothing in the dewar.

·         Per Bob, CCD #1 was permanently damaged. One possibility is the voltage during power up and power down. Chris and Bob did experiments on these sequences, and as a result, changes might be made on the power up sequence to provide more margin. The power down cycle may need to be changed too, taking into consideration that it will be on a UPS at Keck. Sandy wants more data on power down from Bob, as well as procedures written down. There will be a meeting July 5^th with Chris, Bob, Richard and Sandy at 2pm to discuss this further.

·         Since there have been issues with 3 chips, we need to look at this more as well.

·         Boards have not been purchased. They can’t be purchased until after the first week in July (fiscal closure).

·         Schedule summary: The engineering mosaic will be back in tomorrow. If it is leak free, the earliest we can start to cool down is next Monday, meaning it will be cool by Wednesday. There will be 10 chips with known states in the dewar, so we will cool and run the dewar with a goal of no issues. Sandy also wants it cycled and run on the UPS. Kirk should remember the zeolite as well. Next Friday (June 30^th) we will reconvene and decide if we want to warm up.

·         Terry Pfister replaced the plate supporting the mosaic, so it is now level.

·         (Science grade)  The FC left of CCD #1 is 100 microns lower than CCD #1.  Sandy and Kirk to discuss this after the meeting.

·         #1025 (which was in position #1) worked in several cool downs, but now the amplifier has died due to a short. It is currently in the dewar.

·         The thermal circuitry has been reworked, and Kirk is putting the molys on today.

·         Drew created a design file on the slit design . It is on the web.

·         June saw the majority of  SPG’s time on Deimos.

·         3 keyword libraries are built and are ready for testing.

·         The FCS library is not complete yet.

·         There is a 2pm software meeting today.

·         The barcode readers should be here next week.

·         We are making 10 dewar plugs; 4 are for the other cable.

·         90° connector cables were ordered for the PXL camera.

·         Barry did some initial reworking on the power monitor card, but they probably wouldn’t be done for Deimos (unless they were needed for the power down issues).

·         The circuit breakers were labeled side A and B.

·         Barry is worried about the push button stations for various systems. He wants to make sure they are not forgotten by those individuals designing the systems.

·         Temperature sensors shouldn’t go in until the camera does (per Dave).

·         Ken has numbers for all the positions on the filter wheel. There are problems with the belt on focus, and Jim is looking at this.

·         The settings on the clutch on the drive shaft needs to be locked in.

·         A new connector was added to the box to make maintenance easier (so it’s on the outside, not the inside). Barry is working on schematics to bring the shield from Galil to the encoders.

·         We are in the process of putting in the interconnect panel (cables from the boom).

·         Holes are being drilled for cable tie-downs.

·         Sandy reminded Bob to look at plans for grating tilt drive.

·         The glass blank for the grating slide mirror dummy is polished and ready for coating (with the TV mirrors).

·         The collimator mirror is centered, the table is fine, and it is only off 5000-6000^ths from the edge.

·         Sandy put forth a reminder not to forget the fixtures needed to hold the gauges to measure the glass once in Deimos.

·         Coating RFQ’s: Spectrum quoted $44,500, Cleaveland is in the process of getting us a quote, and we haven’t heard back from Coherent at all.

·         The camera is the first major optic going into Deimos. It will go in after July 4^th. Once it is in, the filter wheel will follow, then the shutter.  The other pieces are as follows in order: Collimator, tent mirror, slit mask design, and grating slide #2.

·         Sandy and Dave will have an off-line discussion about flexure tests with the Cohu.

·         Nothing new.

·         The guards were made and are in.

·         According to Jeff, the form will start being manufactured in the Instrument shop this week and will take 2 weeks.

·         The steel mount is complete.

·         Modifications on the long slit were done.  No slit parts were made.

·         One small modification is needed in the form. Matt is working on it.

·         The zinc cadmium and Oriel lights as well as the pen rays are in. We are waiting for the power supply.

·         The cylindrical lens needs a bigger aperture, but it will work.

·         Matt is ready to show Sandy some tests on the different lights. A meeting is scheduled for this.

·         The grating support structure is well along.

·         We are ready to rotate slider #1 and try clamping.  After this, we will reattach sliders 2 and 4 to see if they will also clamp.

·         Slider #1’s motor is in the right place.

·         Jack reminded everyone that there are only 2 gratings.

·         It is repaired and back to Electronics.

·         The spare needs to be modified at some point.

·         The chip alignment to Deimos might come up later.

·         Nothing new.

·         Discussed elsewhere.

·         It is currently in the Electronics shop. The gear box is scheduled in the first week of July.

·         The holes are going in.

·         The grating system in the highest priority, and holes are the second. Please defer to these when working on the structure.

·         Terry Mast wants to have a pupil source meeting on Tuesday the 27^th at 1pm.

·         Dave will meet with Keck personnel when he goes to Hawaii for the SSC meeting. Please talk to Dave if you have issues you want discussed or pictures you want taken.

·         Dave will be researching crane companies while out there, as we will need a large one for installation of the spectrograph on the summit.

·         We are currently creating a shipping and travel schedule to assist with planning and policies well ahead of time.

·         Bob needs to get back to Heather on the raw data issue from the last meeting.

·         Heather is currently unable to access the WWW folders – email to NICS will be sent right after this meeting.

·         Work will start this week on how to password files on the web through Unix.

·         The dewar will be ready to go in on August 8^th. We are currently 5-6 weeks behind, including our contingency.