IMACS progress report no. 25 B. Bigelow 1 May 2000 1) Project Status Currently scheduled tasks: Status: a) Filter server (FSS) fabrication (Kowal) done - early b) FSS assy/test (Guerrero) ahead of sched. c) Disperser server design (Bond) on schedule d) Shutter fabrication (Storts) late finish e) CF guider mech. design (Hare) late finish f) Mask server fab. (Kowal) started g) Collimator mech. design (Bigelow) late finish h) Long camera mech. design (Bigelow) late start i) Dewar fab. (Luppino) on schedule j) Science array controller fab (Burley) late finish k) Motion control electr. fab (Carr/Berger) on schedule l) Control software design (Birk) on schedule Details: d) Late start, but nearly finished g) Coll. design running about 6 weeks late h) Lcam design will follow completion of Coll. design j) Controller design 2+ months late but not critical Other project events: Our new assembly tech, Richard Guerrero, started in April. He has just about completed assembly of the filter server, and testing should start in May. Most of the dewar body and internal structures are now complete in Hawaii. See IMACS website for new images of dewar. All of the IMACS purchase orders were printed out and filed in April. They are now in three binders in Bruce's office and available to everyone as needed. 2) Optics (Sutin) 2.1) I think that all three CaF2 boules have arrived from Optovac. The problem is that the boxes are unmarked, and Optovac thinks that they have only shipped two boules. I intend to repack the boules in new boxes and return the Optovac boxes, as soon as I can get some packing foam. 2.2) Most of the test setup for the center field guider is here, but not all of it. I am short two Edmund Scientific parts and a guider camera. 2.3) We decided to give up the IR, simplifying the coating choices. Bids are now going out for hard coatings on various groups of optics. The field lens coating has been submitted to Newport TFL and Denton. Newport because they are close enough that we can deliver and pick up the optics ourselves, and Denton because they are already doing the similar Magellan ADC coatings. We also discovered that IMACS should deliver acceptable U-band images with a lower cutoff of 0.34 microns. We will have vendors propose coating designs with a lower cutoff of 0.34, 0.35, and 0.36 microns. 2.4) Raytheon has written a research contract to figure out how to make aspheres for the short camera. A copy is in the mail to us. 2.5) TORC is going to go ahead and ship finished elements to OCIW. Status of the science optics is: C01 AT OCIW C02 Finished, being shipped C03 Finished, being shipped C04 Final figuring of second side C05 Polish, 2nd side L01 1st side done L02 1st side done L03 Working first side L04 1st side done L05 In shipping from Corning to TORC L06 In grind DW1 Finished, being shipped DW2 Finished, being shipped Optics TODO List: 1) Re-bid coatings 2) Baffle analysis, baffle materials 3) TV camera designs 4) Filters 5) Asphere fabrication 6) Buy Shack-Hartman lenses 7) Pupil simulator? 3) Electronics (Carr) No report this month. 4) Software (Birk) No report this month. 5) Mechanics Tim: The filter server is almost completely assembled now. There is one more small bracket that Vince has to machine, and then a jig must be designed to hold the three main components in their final positions for testing. There is still wiring and plumbing to be done, and it is assumed that Richard will progress with these tasks over the next week or two. I will design the jig for the filter server next week (5/1). The work on the Disperser server is continuing, and I plan to have a solid model ready for to give to Mary for drafting by the end of this week (4/30). This work includes the grating cell, and the grating tilt mechanism all the way back to and including one half of a matrix ring. Tyson: 1. Shutter parts manufacturing is approximately 75 percent complete. It is estimated that all components will be ready for assembly by May 8, 2000. 2. All purchased parts have arrived. 3. It is anticipated that testing of the linear motors and related software will begin May 8, 2000. As this work progresses further consideration will be given to the proximity sensor issue. 4. Work on the assembly drawing package is underway and will complete the shutter drawing package. 5. Future work on the shutter for the month of May includes final parts manufacturing and assembly, and electronics integration and testing. 6. The center field guide camera design is approximately 66 percent complete. After several iterations it is expected that a solid model for the camera motion stage will be completed on April 28, 2000. 7. Mounting of the CFGC optics will be examined in more detail as the optical elements are selected and arrive for testing. 8. Future work on the center field guide camera includes further development of the solid model and continued opto-mechanical design. 9. Design efforts will shift to the Shack-Hartmann camera in the week of May 1. Bruce: 1) SMS drawing package is in the shop along with the solid models for CNC parts. The mask frames are due back from Rettig in May. 2) The flex-cell prototype parts are being fabricated at BNL in Westlake Village, and are due the first week of May. Richard will be doing the initially assembly and alignment. 3) Design of the collimator doublet was completed in April, and drawings were sent out for quotation. Design of tooling, singlets, and the collimator barrel continues in May. 4) Materials, including epoxies, RTVs, colorants, fillers, primers, and release agents were ordered for testing. Materials testing will start as soon as everything is in. Planned for this month: - design of collimator singlets - design of collimator barrel - design of assembly tooling Gerry Luppino: Fabrication work has continued over the last month. The camera body and 3 side-panels have been received and fitted to the camera back. The invar sub-packages have been received and one has been delivered to OCIW for testing. The following items are in fabrication now: - copper cold straps - guider/FC CCD packages - SS parts for Z-stage - Z-flexure counterweight Several issues have come up that need to be addressed. 1) There will undoubtedly be a problem with dewar window frosting unless there is some means of injecting dry N2 into the cavity between the window and the next optical element. This can be accomplished in the design of the window bezel. 2) We must consider where to locate the 6 vacuum feed-through coax connectors for the PI stage. PI have provided 6 vacuum feedthroughs for this purpose. I propose to mount these onto the backplate of the camera, but I need to consider where they should go. We must also consider whether we want to electrically isolate these connectors from the dewar housing (which I suspect will be tied to system ground). The PI piezos are the LVPZT type that are driven by a few hundred volts, and we may not want the ground of the LVPZT electronics tied to the CCD grounds. 3) Most of the parts are in hand so we can carry out the flexure testing of the focal plane/XYZ-stage assembly. The Heidenhain sensors provided by OCIW will be mounted in an aluminum fixture that will attach to the focal plane mounting plate. This fixture will be designed to it has the same mass (and roughly the same CG) as would the CCDs and their invar sub-packages. The weight of a single CCD mounted on its sub-package is 6.5 oz (0.19 kg), so the fixture plate needs to be approx 1.5 kg to simulate the load on the stage. I will mount the sensors in such a way that they contact the inner walls of the camera body. The 2 sensors will be mounted at right angles to each other. Ideally, the camera body should be quite rigid and this test will measure the differential motion between the focal plane mounting plate and the camera body side walls. 4) I am keen to begin flexure testing, but it will be hard to do before late June. One one hand, the delay is good - for it allows me to complete the Z-drive assembly and the counterweight (for which I am having difficulty finding the material). 6) Detector Systems (Thompson/Burley) Guider cameras -------------- 1 - one guider camera has been shipped to Chile, and another built to replace it in the lab. 2 - seven of the housings have been sent out to be anodized. Mosaic cameras -------------- 3 - the mechanical design of the test dewar faceplate and side-panel are done (ready for fabrication in the shop). 4 - Charlie Hull drew up a mechanical design for the boxes to hold the science camera electronics. The design is ready for the shop. 5 - the temperature sensing circuits have been re-designed to use a platinum RTD sensor, after we temperature tested our previous choice, an AD590 sensor. The AD590 has the simplest interface circuit, but it stopped working at -110 C, which is about 20 C too warm for us to consider using it. 6 - the noise-reducing changes from the guider camera testing have been merged into the preamp board design for the science cameras. 7 - Alan Baggish has started on assembling the Keyence system, plus the stages for the CCD profiling system. 7) Meeting notes: Next IMACS meeting: 10:15, Weds. 5/31/00, new conf. room. Progress reports included above.