IMACS progress report no. 47 B. Bigelow 7 March 2002 I) Project Status Currently scheduled tasks: Status: a) DSS redesign (Hare) IP b) DSS drafting (Cleary) IP c) DSS fabrication (Kowal, Castillo) IP d) Calibration system mech. des. (Hare) IP f) Long camera opto-mech assembly (Bigelow) IP g) Principal Guider Camera elec. assy (Asa) done h) Science Array controller fab (Burley) 95% compl. i) Filter procurement (Sutin) IP j) Grism procurement (Sutin) IP k) Motion control electronics design (Bagish) 95% compl. l) MC fab. (Asa) 70% compl. m) Control software design (Birk) on sched. p) Instrument structure fabrication (M&T) late, due 3/12/02 q) Instrument carriage fabrication (Rettig) done Project events in February: - The structure carriage was completed, delivered and assembled. - The structure is nearly finished and is due for delivery on 3/12/02. - Assembly of the CCD science array has started, and early results suggest that reaching the packing and flatness specifications will not be a problem. Latest project images: Structure: http://www.ociw.edu/instrumentation/imacs/devel/structure/index.html Disp server: http://www.ociw.edu/instrumentation/imacs/devel/dss/index.html Long cam assy: http://www.ociw.edu/instrumentation/imacs/devel/lcam/index.html Collim. assy: http://www.ociw.edu/instrumentation/imacs/devel/coll/index.html II) Optics (Sutin) 1) Short camera spherical lenses: S05 is delivered. S09 and one other lens (either S07 or S03) are finished and being shipped. 2) Short camera aspheres: Tinsley is working. They have some delays due to their recent move, but have not updated their schedule yet. I predict that they will be a bit late. 3) We have quotes for the 200 l/mm and 300 l/mm grisms. They are rather higher than expected. Glass has been shipped to Thermo RGL to make the 200 l/mm grism. We are still waiting for the material for the 300 l/mm and 600 l/mm grisms. 4) The collimator was tested in double pass. No problems were detected, although the experiment was limited by the resolution of the video camera. 5) We have the CTIO B, V, and I filters from Barr. They are having problems with the R filters. No solid delivery date has been given. We have a quote on Sloan filters, which was also higher than expected. No decision yet whether we order any. 6) No word from STF on the short camera coating quotation. 7) I have checked into a spare blank for L05. Canon is too busy. Schott has supposedly quoted $35K. I also asked ESO if they wanted to buy the S02 spare (no), and if they had a blank for L05 around (no reply yet). Schott was also asked if they would sell our spare S02 blank (no reply yet). 8) The Newport coating on the direct imaging filter failed. We will probably re-coat with protected aluminum, which mitigates against failures or this sort, although with some light loss. It is being sent back to TORC for inspection, since the surface looks a bit sleeky, which could be the polishing or the coating. III) Electronics (Bagish) - Motion Control Electronics Rack #1 came in, Rack #2 is on-order. - Rittal heat exchanger came in - will be mounted on side panel of Rack #1. - 80 Pin Phoenix contact break-out PCB went out for fab, came back and four units have been assembled. - Altera hard-stop logic PCB was sent out for fab, came back and one board has been assembled, programmed and is being wired into Chassis #3. - Chassis #3 is in the middle of being wired up. - Schematics continue to be updated with minor corrections and fixes. IV) Software (Birk/Clardy) Birk: - PR guider: We are still waiting for the delivery of the new 15:1 gear. - SH guider: 1) The theta-drive encoder is broken; a new encoder was ordered but has not yet arrived. We tested the theta-drive using the encoder for the radial motion. It is working ok except that the drive needs a higher gear ratio (15:1) like the PR-guider theta axis. 2) The radial motor driver is not working reliably. We might need a new driver. 3) The solenoid/air-cylinders for the guider-filter and optics-barrel are working fine. - Science array software no progress this month. March TODO-list: - continue PR-guider tests with new gear (arrival date: 3/6) - continue SH-guider tests (awaiting new gear/encoder/motor-driver) - Science array S/W: sub-raster and shuffle modes Clardy: A character plotting program has been constructed to allow ANY plotting/engraving machine to draw characters. At a specified location, and with a specified direction and character size, a character string may be "plotted". Enhancements include the ability to plot on a circular curve, and to italicize letters by slanting them. Locations and sizes of labels on the IMACS slit masks have been selected and programmed. The mask cutting program will now drive the laser machine in the Z direction as well as the X-Y coordinates, and will produce code for the mounting clearance and alignment holes. The actual laser parameters and on/off protocol has yet to be decided, but is expected to be easy. Testing of the LDSS-2 mask capability has found and solved some small program bugs; this test serves as an additional verification of the mask generation correctness for IMACS too. Jury duty may interfere with work in mid-March; I will attempt to get a postponement until after March 22. IV) Detector Systems (Thomson/Burley) In February, we finished wiring the IMACS electronics box and sent the box out for anodizing, built the preamps onto the face-plates for IMACS and MIKE, and completed building and testing the first round of circuit boards for the ccd controllers [10 preamp, 4 dsp, 4 power, 8 clock driver, 8 signal processor, 1 long backplane, 3 short backplanes]. A set of boards includes: MIKE: 1 preamp, 1 dsp, 1 power, 1 clock driver, 1 signal processor, 1 short backplane IMACS: 4 preamp, 1 dsp, 1 power, 4 clock driver, 4 signal processor, 1 long backplane On the mechanical front, the initial profiling of all 11 SITe chips is complete. The chips are mounted on a combination of "boats", nine original boats plus two that we made up here. As a check on the alignment procedures (and the IMACS platten), we adjusted two of the chips for height (by grinding the feet of the boats), and aligned them with the calibration jig. Then, the two chips were mounted side-by-side, and then toe-to-toe on the IMACS platten. The toe-to-toe tests were repeated in each of the four possible positions. Side-by-side, the peak-to-valley flatness is less than 20 um (of which about 10 um is inherent in the chips themselves). Toe-to-toe, the peak-to-valley flatness is 20 um to 40 um depending on which of the four positions of the chips were populated. It appears the platten is "pringle" shaped, and we have sent it out to be lapped flat. Toe-to-toe the alignment of the long edge of one chip to the long edge of the other chip has an offset of about 1 pixel. Side-by-side the alignment of the long edge of one chip to the long edge of the other is parallel to about 1 pixel. V) Mechanics (Bigelow/Hare) Bigelow: In February: 1) Completed potting of all lenses in the long camera. 2) Completed prelim. design of grism cells (3). 3) Completed design of guide camera mount for long camera focus testing. 4) Completed design of mask cutting tools for tests at Convergent in March. 5) Completed design of alignment telescope mount for cameras and collimator. In March: 1) Acceptance and installation of the instrument structure at SBS 2) Acceptance testing and process optimization for the slit cutting laser (at Convergent, in Sturbridge, MA). 3) Check and adjust lens spacings in collimator 4) Check and adjust lens spacings in long camera Hare: Current Work * Made revisions to miscellaneous guide camera hardware to resolve minor interferences with slit-mask server. * Opto-mechanical and electro-mechanical assembly and testing of the Principle and Shack-Hartmann Guide Cameras. * Fabrication of the Disperser Server Wheel Assembly and Main DSS Support Assembly in progress. * Resolved limit switch issues on the Grating Tilt Mechanism. * Assembly of the Clamping Assembly complete. * Design of Field Lens Tooling Assembly complete. Miscellaneous hardware has been ordered, purchased, and arrived. Future Work * Continue assembly, testing, and rework of all guide cameras as necessary. * Assemble one Grating Tilt Mechanism for testing. * Assembly and testing of the Disperser Server System. * Revise and fabricate DSS Drive Assembly * Fabricate Field Lens Tooling Assembly and mount Field Lens. * Fabrication of the second shutter. * Resume design work of the Calibration Unit. VI) Fabrication (Kowal) In February: 1) Alignment Telescope Mount was finished. 2) Dewar Focus was completed. 3) Field Lens Spacer is done. 4) Bore Tools have been made. 5) Field Lens Tooling is currently being milled. 6) Delrin Plugs & Tooling is done for Field Lens Cell. Expectations for March: 1) Completion of Laser Tooling. 2) Completion of Field Lens Tooling. 3) Mask Shuttle Support. 4) Electronic Panels & Chassis. 5) Convergent Prima laser training. VII) Other Business Next meeting: 10:15, 4/3/02