IMACS progress report no. 36 B. Bigelow 5 April 2001 Project Status Currently scheduled tasks: Status: a) Disperser server (DSS) design (Bond) in progress (late) b) DSS drafting (Meyers) IP c) DSS fabrication (Kowal) IP d) SCAM filter server (Asa) IP e) Field lens mechanics (Hare) done f) Field lens drafting (Myers) done g) Field lens mechanics fab (Hare) on sched. h) Calibration system mech. des. (Hare) delayed i) Mask server integration (Asa) late (90% compl.) j) Coll. fabrication (Danco) done, but not to spec. k) Coll. opto-mech assembly (Bigelow) late start (April?) l) Long camera drafting (Cleary) done m) Long camera fabrication (Bigelow) on sched. n) Center field guider mechanics fab (Storts) on sched. o) Science Array controller fab (Burley) 95% compl. p) Short Camera mech. design (Bigelow) on sched. 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 Recent additions include a new, up to date instrument model on the home page, and current construction images of the collimator mechanics. Optics (Sutin) 1) The final design for the short camera has been check out. The average of the 80% encircled energy diameters for the spots are is about 2 pixels. 2) Since the filters were sent out for quote, CTIO re-measured the filters that Arlo Landolt uses for photometry. Two sets of BVRI filters identical to CTIO set have been ordered from Barr. 3) Spectrum Thin Films doesn't seem to be able to design a reproducible coating for our wavelength range any better than Newport. They say that they are getting new, amazing equipment that will help. I am skeptical. 4) Newport coated one side of C02 and C03. After receiving the plot scan from hell, Newport retracted it and gave us a new scan. The second version has an average throughput of about 1.2% from 0.33 to 1.1 microns. 5) TORC is still finishing up L04 and L06. Some thin elements tend to non-sphericity during polishing near the thin center. Electronics (Asa) Completed in March: 1. Testing of the filter server 1 has been completed. 2. Shutter: Magnets have been installed as detents. A test has been set up on the gap bed lathe including measurement of actual exposure time and ability to drive in all orientations. 3. Translation and stop brackets have been finalized for the center field guide camera. 4. Assembly drawings for the grating tilt mechanism have been rebuilt. 5. Parts have been ordered and drawings produced for the second electronics chassis. Planned for April: 1. Filter server 1 will be disassembled. Parts for both filter servers will be light-weighted, and anodized. 2. Ringing out and testing of the SMS will be conducted in the first week of April, and will continue in early May. 3. Brackets for the principle guide camera will be finished in the first week of April. Software (Birk/Clardy) Clardy: No report this month. Birk: Done in March: 1) filter-server(1) tests at extreme position angles (vertical slide move, vertically pushing solenoid, vertically pulling solenoid) -> ok 2) updated shutter-controller software to power-down the linear motors during inactive periods. Planned for April: 1) test shutter with magnets (vertical move) and verify timing 2) start on mask-server software and tests Detector Systems (Thomson/Burley) Monthly progress continued toward powering up the science electronics and testing a chip. This work involved some mechanical work on the dewar (temperature and pressure sensors, cooling straps, CCD fixture mounting). Electronics work included wiring the hermetic connector on the dewar and revising the schematics and pcb layouts to correct previously detected mistakes on the clock driver, signal processing, and power boards. Programming work included adapting some of the guider camera software for use on the science cameras (CCD dsp code and test routines), as well as programming the EEPROMS, the last remaining part of the dsp code. We expect to power up the engineering grade CCD in the second week of April. Mechanics (Bond/Hare/Bigelow) Hare: March: * Prepared Shutter for extended operational testing. * Revised Guide Camera parts (solid models and part drawings). * Compiled necessary documentation for Field Lens Assembly RFQ * Revised 'structure-less' IMACS solid model. * Compiled and facilitating information and data transfer to Gunnels for structure design April: * Further Shutter testing. * Let contract for Field Lens Assembly fabrication. * Continue revisions to guide camera solid models and part drawings as needed. * Continue with structure work. * Resume design work of the Calibration Unit. Bigelow: March: 1) Completed long camera drafting (assembly dwgs, Cleary) 2) Received quotations for mask cutter based on commercially available mills equipped with precision height sensors 3) Continued short camera design - thermal analysis of coupling oil 4) Completed baffle mech. design for collimator 5) Compiled quotes for long camera fabrication April: 1) Start opto-mechanical assembly of collimator (slipped from March) 2) Let fabrication contract for long camera 3) Continue short camera mechanical design 4) Finalize mask cutting plans and prepare for mask cutter contract Bond: March: DSS design went along pretty well as planned. I continued developing the solid models and required calculations for the new disperser carousel. Work on the new carousel is complete with the exception of a few minor details (nuts/ bolts/ minor interferences). By the end of the week (4/6) I should have the models to the point to be able to give a package to Richard/Julie to begin drafting. April: Will be spent expediting the disperser tilt mechanism, filter server system, and getting the drawings ready for the carousel. Fabrication (Kowal/Storts) Kowal: March: 1) Machined G.T.M. Drive Sectors through 1st op. 2) Currently machining Drive Sector Support (once completed it and the Drive Sector can be sent out for welding). 3) Received titanium from Metal Cutting Services for the Trunion and Flexure (still waiting for delivery of the titanium for the two additional flexures, once they are received they will be sent for saw cut as well). 4) Conducted two interviews for our machinist position, with another one scheduled for today. This has taken much longer than expected. 5) Selected, ordered and received high-speed air spindle & endmills for slit mask cutting test. 6) Reviewed design of guider barrels and endcaps with Tyson to make sure they are manufacturable. Suggested a re-design of the mating surface so that they are perpendicular to the bore of the barrel. Planned for April: 1) Make decision on machinist. This could be by the end of the week. 2) Working with new machinist on the titanium pieces for the Grating Tilt Mechanism. 8) Other Business Next meeting: 10:15, 5/2/2001