DEIMOS TEAM MEETING
Date 03/07/01

Attendees: Ken Dietsch, Carol Harper, Dave Cowley, Dave Hilyard, Jerry Cabak, Vern Wallace, Kirk Gilmore, Heather Mietz, Jeff Lewis, Jack Osborne, Chris Wright, Bob Kibrick, Sandy Faber

1.  Next Meeting:

Tuesday, March 20, at 9:30 a.m.

2.  CCDs, Mosaic, Controllers, etc.

CCDs:

Chris and Bob are working on the controller at this time (and are pleased with it). Once finished, they will hook it up to the dewar. Chris is working on the wiring.

VME Crate: Bob said the power PC board from CARA is not reliable. The order for the boards has been put on hold. If there is no resolution within a week, we will use the Force board for flexure testing. Sandy suggests using this CARA board, as the imaging testing goes faster (transfer rate is so much higher). This makes up for lost time in rebooting the system.

Mosaic:

Kirk moved the FC #1 device closer to the science CCD - the gap is currently 1.2, which is as much as we'll get.

Sandy wants a reminder to talk to Gerry about the Lot 14 devices.

Kirk will measure the flatness of the diagonal (on the blue mosaic) and wonders what number he should use.

This will be discussed offline. Kirk did a visual of the Lot 14 devices. There is an issue with overhang. The silicon is misaligned with the aluminum nitride on the long side. The silicon sticks out over 50 to 200 microns. Sandy wants us to think about this for a few days. Kirk will not make any holes in the backplane until these problems are resolved. 1 CCD (14-7-2) has a bad connector foot. We are going to do some experiments here. Also, there are some issue with dirt and scratches which happened before they were sent to us. The coating is fragile, so Kirk will have to experiment on the engineering devices to find out ways to clean these. For clarification purposes, there are 6 scientific devices and 1 engineering device.

Dewar:

Terry is now finished with the dewar. Bob and Kirk will work on it when we are done checking the wiring. The dewar will go across the street on Friday.

State of the dewar: The backplane has been rotated, so the new red invar backplane is now at 0 rotation. This backplane is 20 thousandths thicker, so it has been spaced back and shims have gone on the blue side. This means we shouldn't have to re-shim when the red side goes in. When Kirk puts the blue backplane in, he'll measure the same location for rotation. More discussion on leveling will occur after this meeting.

3.  Software (Bob)

Software is ahead of schedule on the Piezo and barcode reader in that they operate under keyword control. The Piezo is now in De's office, and we are seeing a historesis pattern of 10-20%,but it is still unclear on how we are going to calibrate this out. This needs to be a tenth of what we are seeing, so we need to figure this pattern out.

Rotation: the motor is in as we speak. Will is getting grating data from the Renishaw encoders.

Steve was out for a week, so the lickserv is a little behind schedule.

Dean is working on the slit mask and is on schedule.

A Keck software meeting is scheduled for Tuesday, April 10, 2001, here at UCSC.

4.  Electronics (Barry)

Ted is working on the AC wiring for the cradle.

The integrated PC is working fine, and Ken is also working on a portable test controller for the Galil software. We will use this for testing, then we'll be able to find the K factors. With this we can run the motor rotation through the laptop.

Bob said that a portion of the Renishaw tape was damaged and repaired, and this could be problematic in the future. Sandy suggested we add this to a notes to CARA file on how we repaired it. We will be bringing spare tape with us as well. Dave needs to come up with a procedure for such notes in the future.

Ken is cleaning up the calibration wiring, and it's half done. The time delay has been added to the box. Ken says the slit mask barcode reader is working fine, and he is working with De to make cables. He is also wiring up the panic buttons. The focus and x stages are also working well, and De has K tested this. He is adding over temperature boxes on the AC wiring at various locations. The grating clamps testing software is done for the automatic computer control testing. Ken is currently working on the Piezo.

Electronics also wired up the barcode spares.

Carol Harper is working with Chris in fixing the cable problems. They are trying to find something to cover these wires, because it could effect the noise level. Carol is writing a slit mask code for Vern - Keck wants to ensure the insertion goes 200 times. Carol also worked with Ken on the dewar numbers for the focus stages.

5.  Optics

Dave Hilyard did filter research all this week and found a source for the 6.5" Schott filters that are polished. A quote was sent per our specs.

Camera: Vern re-measured the distance on the placement of Elements 7 and 8. He tested the operation on thermal compensator adjustments and it worked. The travel was measured at .65 millimeters forward and .3 backwards. It is limited by the post coming out of that element. The thermal compensator attaches to that post.

The Cohu will go on the grating mirror today to do the first flexure tests, then the Cohu will go into the new mount for Element #9 with Slider #1. He is taking images for flexure this afternoon. This will be done by Friday.

6.  Mechanical

Slit Mask:

FC Light System (Dave C. for Matt):

Cladding:

Baffling:

Glycol Cooling:

Grating System (Jack):

The grating system still needs to be mounted. This will be discussed at a later date. Grating box #3 was built. 3 shims were made to mount the box to the drive disk. The system is 120 lbs heavier.

Matt is finishing up work on the space frame.

Sliders 3 and 4 are disassembled to be retrofitted with the cone, and some redesign is needed. The flexure was tested in slider 3. The grating moved laterally in 4 thousandths of an inch. Vern thinks something is loose.

Parts came in for the interlock assembly, and the documentation for this is done.

Flexure:

7.  Alignment

8.  Testing

9.  Site Report (no Greg)

Dave said that Jim Bell has been reassigned because a senior engineer on another project quit. This project that this person was working on will take up 60-70% of Bell's time. This will be discussed in further detail later.

The Nasmyth deformation tests were supposed to happen this week.

CARA will be coming out here in mid-May, and a readiness review is tentatively scheduled for May 10. A real date is needed soon.

10.  Web Report (Heather)

11.  Shipping/Travel

The meeting with Matson in Oakland went well, and we got a lot of information on how to ship DEIMOS from UCO Lick to the Port of Oakland, and from there to Hawaii. DEIMOS will be put on a Matson ship in an open rack on a Friday (9/14/01). This ship has an ideal set up because the instrument will be in the hold and therefore protected. Once in Hawaii (on the following Tuesday), it will sit in Honolulu for three days, then go on a barge to Kawaihae on the following Sunday. Heather and Rachel are working on getting dimensional allowances for overpasses, air freight, etc.

A shipping structure requirement meeting for shipping is scheduled for Thursday, March 15 @ 9:00 a.m. Jerry, Dave, Sandy, Jeff, Matt R., and Dick are expected to attend.

Jerry is analyzing the requirements for the camera shipping box. If we need to survive a 5' drop, we'd need 24' of foam around it. Thermally, the box we have has at least a 24 hour time constant. Jerry will send Sandy the results of his analysis.

12.  Schedule

Minutes written by Heather Mietz, email: heather@ucolick.org