IMACS progress report no. 33 B. Bigelow 12 January 2001 1) Project Status Currently scheduled tasks: Status: a) Disperser server (DSS) design (Bond) delayed (see below) b) DSS drafting (Meyers) on sched. c) DSS fabrication (Kowal) on sched. d) SCAM filter server (Asa) started e) Field lens mechanics (Hare) done f) Field lens drafting (Myers) starts in Jan g) Calibration system mech. des. (Hare) starts in Jan h) Mask server integration (Asa) late (80% compl.) i) Coll. fabrication (Danco) late (75% compl.) j) Coll. opto-mech assembly (Bigelow) late start (Feb?) k) Long camera mech. design (Bigelow) done l) Long camera drafting (Cleary) started m) Dewar fabrication (Luppino) done n) Center field guider mechanics fab (Storts) on sched. o) Science Array controller fab (Burley) late (95% compl.) p) Short Camera mech. design (Bigelow) late (starts Jan) q) Filter procurement (Sutin) on sched. r) Grism procurement (Sutin) on sched. s) Motion control (MC) electr. design (Carr) late (70% compl.) t) MC fab. (Asa) late (50% compl.) u) Control software design (Birk) on sched. Project events: Latest construction images can be seen on the IMACS web site: http://www.ociw.edu/instrumentation/imacs The IMACS dewar is complete and at OCIW. A minor modification of the design, which rotates the orientation of the Cryotiger closed-cycle coolers, has been ordered. Completion of the detector system now awaits the profiling and mounting of the CCDs, and completion of the science array controller electronics. An error in the drawing for the long camera element 6 was discovered following the completion of fabrication. The element will be remade by TORC using the first L06 lens blank. Fabrication of the collimator mechanics, now 3 months late, is promised to be finished by the end of January. All the parts, except the barrel, are finished and in varying coating processes. A new temp. drafter, Richard Cleary, joined the project on 1/8/01. Richard is currently working on the disperser server, collimator, and long camera drawing packages. Julie Meyers is continuing to do drafting for us on a consulting basis, and has recently finished the three guide camera drawing packages. As of 1/9/01, Steve Gunnels has agreed to design the IMACS instrument structure and support carriage. This is a major change in the project, and is expected to help us complete fabrication of the instrument by the end of 2001. In addition to guaranteeing an excellent structural design, Steve's work will free up time for Bruce, Tim, and Tyson to complete the remainder of the mechanical design and fabrication by the end of this year. Steve will be starting work on the structure in early March. Finally, project progress in December was limited by the holidays, and happily, by the dedication ceremonies for the Magellan I telescope, which were held in Chile. Bigelow, Sutin, Kowal, Asa, and Storts attended. As part of the ceremonies, an eyepiece was attached to the telescope at the Nasmyth focus, and everyone had a chance to look at Saturn and a couple of other targets. It was quite awe-inspiring to see not only that the telescope is performing beautifully, but that it is also ready for instruments now! 2) Optics (Sutin) 1) We have two competing offers for making the Short Camera aspheres. Either REOSC, which is expensive, or Lick/fab + UofA/test. Jim Burge has confirmed that the aspheres can easily be tested if two holograms are used for each asphere, one for the inner region and one for the outer region. We expect a written proposal in mid- January. 2) We have two replies from filter manufacturers, Barr and Custom Sci. Both bids require revision. No word from Omega. The clear glass spectrograph dummy filters are being bid out to TORC for fabrication. 3) The large piece of CaF2 for mechanical testing is at TORC. 4) Schott will deliver an un-shaped cut disk for S02 for lots and lots of money. 5) Corning/Optovac is waiting for a reject from the lithography CaF2 to send to us. Sadly, they are apparently having good yields. 6) Epps has the data for the Long Camera final update, and as soon as that is done, TORC will finish up the last (pick-up) surface on L04. 7) Since extending the wavelength range down to 0.34 microns for U-band imaging seems to compromise the coating designs too much, we decided to forgo that idea, and are proceeding with the original wavelength range. Newport TFL and Spectrum TF are both currently doing designs and will be doing test runs in the next week. TODO: Grism designs 3) Electronics (Asa) Slit Mask Server: Chassis - I have solved the high density ribbon cable break-out dilemma. Parts have been ordered and should arrive soon. Wiring the chassis for the slit mask server will take only a day or two. Cables - Cable lengths need to be calculated. This entails making decisions about cable wraps, chassis placement, etc. The cable for the filter server is 50' long. If we do that for all the cables, we will have a lot of excess cable bundles hanging from the instrument. Misc. wiring details at the mask server have been resolved. Brackets have been designed to hold the hardware limits on the stage. Brackets will be fabricated to mount 6 additional V rollers in place of the plastic rails on the filter frame to reduce friction. The plastic rails will remain on the stage. Shutter: All parts have been anodized, and the shutter will be assembled as Vince and I find time to fab the new teflon rails. In the mean time a temporary set up is being built for Christoph to test the rabbit micro with the shutter motors. Guide Cameras: Brackets and stops have been designed for the translation of barrels and filters for the 3 guide cameras. Mounting points/brackets for hardware limit switches are still pending. Filter Server: Light-weighting and as-built modifications to the filter server part drawings have been made. It is recommended that these modifications be physically made to the parts of both filter servers at once. As soon as Christoph has run filter server #1 though it's paces (pending filter frames), we can disassemble it and modify parts for both filter servers. 4) Software (Birk/Clardy) Birk: During December I worked on programming the micro-controller for the shutter. I have written a draft version of the necessary software and I will test it together with the shutter hardware in January. 5) Mechanics (Bond/Hare/Bigelow/Luppino) Bond: Disperser Server: December was spent finishing the design of the disperser carousel; however, discussions at the end of the month revealed that by removing a grating position from the wheel, we could change the packaging from a wheel tipped at 45 degrees to a wheel in the vertical plane (also by relaxing some of the welding requirements on the structure). As a result, the completed carousel design is on hold while I investigate the feasibility of the new vertical carousel. For January, I plan to finish a few small tasks on the tip mechanism, and filter server. The rest will be spent on the new carousel design. Hare: 1. The shutter has been anodized and re-assembly will begin this month. 2. Future work planned for the shutter includes further operational tests, and continued software and electronics integration. 3. Revisions to the Guide Camera solid models continue to be made as needed. 4. The part and assembly drawings for all the Guide Cameras are complete and are being reviewed and red-lined as necessary. 5. Manufacturing of the Center Field Guide camera has begun. It is anticipated that the motion stage for this camera will be completed this month. 6. Approximately 90% of the purchased parts for all guide cameras have been ordered, with the exception of some optical mounting elements. Part ordering for the guide camera should be completed by month's end. 7. Future guide camera work for the month of January includes completion of purchased parts ordering and drawing reviews and revisions and continued manufacturing of the Center Field Guide Camera. 8. A design review of the proposed field lens cell was held on January 10, 2001. Several suggestions and changes were made and are being incorporated into the design. A final revision of the solid model should be ready for drafting by January 17th. Bigelow: In December: 1) Attended Magellan dedication in Chile 12/5 to 12/12 2) Started design of long camera assembly tooling 3) Held Long Camera internal design review 4) Completed Long Camera mechanical design following review 3) Completed drafter recruitment (Richard Cleary) In January: 1) Start Long Camera drafting (Cleary) 2) Complete Long Camera fab and assembly tooling design 3) Re-start slit-mask cutting development 4) Start Short Camera mechanical design 6) Fabrication (Kowal/Storts) Kowal: 1) Started production run of filter frames. Twenty-nine have been finished through 1st op. Second operation is in the middle of set-up. Apx. 2-3 days of milling left. 2) Generated drawings to supply titanium vendor for saw cutting material as needed. 3) Started planning execution of trunion and grating flexure. (various operations and fixtures required) 4) Put thought into what we should be looking for in an apprentice for the shop. 5) Ordered some tooling for titanium parts. 6) Sawed material for fixturing grating flexure. 7) Detector Systems (Thompson/Burley) Guider cameras -------------- 1 - tested the guider cameras at Magellan for the serial link fix, image transient fix. The cameras are much more robust now. Currently there are four working guide cameras and interface cards at Magellan (plus two cameras in the lab in Pasadena). 2 - new CCDs started arriving for next batch of cameras. Science cameras --------------- 3 - updated the EPLD code and programmed the two EPLDs on the first dsp board (ready for testing) 4 - updated the EPLDs on the PCI board and tested the 4-wire serial link in loop-back mode 5 - all the difficult to find parts have now been ordered (thanks Jeanette). 8) Other Business Next meeting: 10:15, 1/4/2001