IMACS progress report no. 28 B. Bigelow 3 August 2000 1) Project Status Currently scheduled tasks: Status: a) Disperser server (DSS) design (Bond) started (3 behind sched.) b) DSS drafting (Meyers) started c) Structure pre-lim layout (Bond) late start d) CF Guider mech. design (Hare) done e) CFG drafting (Meyers) started f) CFG fab. (Storts?) awaits drafting g) SH Guider design (Hare) finishes 8/4 (1 mo. behind sched.) h) SHG drafting (Meyers) started i) Principal Guider design (Bond) started j) Mask server fab. (Kowal) on sched. k) Coll. fabrication (external) late start (3 mo. behind sched.) l) Long camera mech. design (Bigelow) on sched. m) Dewar fab. (Luppino) due 9/30/00 n) Science Array controller des (Burley) 90% complete o) Science Array fab (Burley) 60% complete p) Motion control (MC) electr. design (Carr) delayed q) MC fab. (Asa) delayed r) Control software design (Birk) on sched. Details: a) DSS late but progressing well. b) drafting of grating cells started c) delayed by late finish of DSS design f) Fab awaits drawings k) Bids received, as-built updates, fab contract let by 8/15/00 m) Dewar is late, now due 9/30/00 p,q) MC electronics late, but not critical Project events: Due to a new agreement between OCIW and U. Toronto, additional instrument funding has become available, with the result that IMACS is now fully funded through completion, including the short camera (SC). Consequently, procurement efforts for SC lens fabrication started in July. All the Ohara glasses, and two of the 3 CaF2 blanks for the SC are now in hand. Raytheon has responded positively to inquiries regarding fabrication of the two SC aspheres, and a contract is being pursued. Flexure testing of the IMACS dewar was completed at the UH/IfA in July. The final fabrication contract for the dewar, including the two Cryotiger closed-cycle coolers, has been let. The finished dewar is now scheduled for delivery at the end of September. The Univ. of Durham (UK) has quoted on the fabrication of two integral field units (IFU) for IMACS. The specifications for the IFU's are currently being established. Our new drafter, Julie Meyers, started 7/10. Julie has been ripping through the FSS, SMS, and guider drawing packages at a furious rate. This is very good. Joe Asa has started work for IMACS, and is currently completing the wiring and plumbing details for the filter server . Budget and Schedule: Now that IMACS is fully funded, the project budget and schedule will be reviewed and revised in August to include fabrication of the short camera. We will be striving to deliver the short camera with the rest of IMACS at the end of 2001, which still stands as our (ambitious!) delivery date. 2) Optics (Sutin) Optics: 1) All the collimator elements are at various coaters. We are waiting for the dummy optics to be finished before the design can begin. 2) All of the glass long camera elements are finished. The CaF2 long camera elements are still being worked at TORC. 3) The guider test setup for the center field guider imaging system has been set up and works as designed. It also came in handy for doing some "debugging" of the guide camera (the suspected bug was not there). Next the Shack-Hartman center field and principle guiders need to be done. 4) Raytheon thinks that they may, in fact, be able to make our aspheres. We expect more information to be forthcoming. 5) The footprint for the filters, with and without the wing chips, has been calculated for both cameras. This is part of the RFQ's to go out for a set of Kron-Cousins UBVRI filters. How to spec the optical quality remains a mystery. Also, the U filter bandpass depends on the coating design blue cutoff. 6) Since Optovac/Corning is not taking orders for more CaF2, we might again consider getting a backup boule of CaF2 from Schott. 7) The pupil simulator needs to be 1.114 meters in diameter and be placed 12.25 meters from the slit mask of IMACS. Relative to the assembly area of IMACS, This spot is in the center of the parking lot. Brian Optics TODO List: 1) Baffle analysis, baffle materials 2) TV camera final designs 3) Filters 3) Electronics (Carr) No report this month. 4) Software (Birk/Clardy) Christoph: I finished the filter-server control software in July. It consists of three levels (GUIs): 1) Test-level: allows independent movement of both axis; no interlocks except tray will not move while slide is not out. Setting of all parameters (e.g. motor speed, acceleration) All position sensors and limit-switches are individually displayed. 2) Engineering-level: allows independent movement of both axis but moves tray (in/out) at designated positions only. All parameters (e.g. speed,acceleration) are read from initialization files. All position sensors and limit-switches are individually displayed. 3) User-level: Access to filter by named position only. Individual status displays are replaced by a combined status (ok/error). Includes self-test function: 1) search 'home' position 2) find limits 3) move in/out all 15 filters in random order. For August I plan to continue working on the CCD/CameraGUI. If the slit mask server becomes available, I will start on its control software. 5) Mechanics (Bond/Hare/Bigelow/Luppino) Tim: No report for July due to vacation. A internal review of the grating cells and tilt mechanisms was held in July. Only minor changes were suggested, and drafting of those assemblies will start in early August. Tyson: IMACS Guide Camera Stages: The drawing package for the Center Field guide camera is complete. This package will be released for manufacturing once a final review of the drawings is complete, set for August 7th. The mechanical design of the Shack-Hartmann guide camera motion stage was reviewed on July 31st, 2000 and several improvements and changes are being implemented into the solid model. It is expected that these revisions will be complete by August 4th. Drafting for this stage will begin August 7th. Design of the Principal Guide Camera has begun. Commonality between the three guiders exists which should provide an efficiency at the design stage. It is expected that the mechanical design the Principal Guider will be complete as of August 14th. Design for mounting of the camera optics is set to begin on August 14th with a target completion date of August 31st, 2000. Future guide camera work for the month of August includes continued design, development, and manufacturing of all three guide cameras. Bruce: Slit Mask Server: Outside fabrication of the slit mask frames (Rettig) and the SMS baseplate (CNC Ind.) was completed in July. Vince is nearly finished with the remainder of the SMS parts. Assembly started in late July and should be complete in early August. Mark Filho of Newmark Systems is working on an estimate for a three-axis machine tool for milling slits in the slit masks. This estimate will be used as part of the selection process for the final slit mask cutting method. Collimator Mechanics: Material properties testing of the filled epoxy was completed successfully in July by Orange County Materials. The epoxy/fused silica mixture will be used to mount each lens in its flex cell. Assembly of the flex cell prototype started in July with the bonding of the test window into its cell. Assembly of the test cell will be completed in mid-August. Compatibility tests with the multiplet coupling oil were started in July for all of the multiplet materials (o-rings, epoxies, RTVs, etc) A final, as-built prescription for the collimator was completed by Epps in July. Based on the final dimensions and spacings of the collimator elements, the collimator cell drawings are being revised and will be released for fabrication at Danco Inc. (Santa Clara) in mid-August. Long Camera: Design and analysis of the thermal compensation cell in the long camera was completed in July as planned. Design work will continue in August. Planned for August: - let collimator fab contract - complete assy. of SMS - complete assy. of test cell - compile cost estimates for slit mask cutting options - design of long cam. thermal comp. actuator and dewar mounting plate - progress design of long cam. barrel Gerry Luppino: No report from Luppino this month. Flexure testing of the detector array assembly was successfully completed in July. Fabrication and purchasing for the cold side (Cryotigers) started in July, and the dewar is planned to be complete at the end of September. 6) Detector Systems (Thompson/Burley) Guider cameras: 1 - completed assembly of four more guider cameras (for a total of six with CCDs installed). One of them has one non-functional output channel that needs further debugging. 2 - updated the dsp code + test program to include a robust command word function to prevent possible corruption of the commands sent to the dsp. Also added selectable gain (high/low) and output amp (left/right) features. 3 - started preparing for a multi-week test of a guider camera to check the dry gas sealing of the ccd, among other things. Ordered a small water chiller so that we can run the thermoelectric cooler continuously. 4 - provided a camera to Brian for his tests of the IMACS guider setup. Mosaic cameras: 5 - revised the design of the PCI interface card to include the changes from previous testing. 6 - (almost) finished the design of the pre-amp board for the lab test dewar, which will be a rigid+flex circuit design similar to the IMACS pre-amp board. Our normal pcb supplier (Prime Technologies) doesn't make these types of flex boards, so we may try XZX in Santa Ana. 7 - designed a thermal isolation flex circuit cable for the SITe chips (as suggested by Gerry Luppino) and found a source of 37-pin micro-D connectors. 7) Other Business Next IMACS meeting: 10:15, 8/30/00, new conf. room. Progress reports included above. Meeting notes and action items: 1) Christoph and Dave to meet regarding control issues for driving the shutter 2) Brian and Tyson to finalize guider optics spacings 3) Bruce to hound Rettig regarding fabrication of lens models for coaters