IMACS progress report no. 42 B. Bigelow 1 October 2001 Project Status Currently scheduled tasks: Status: a) DSS drafting (Cleary) IP b) DSS fabrication (Kowal, Castillo) IP c) Calibration system mech. des. (Hare) IP d) Coll. opto-mech assembly (Bigelow) late (awaiting optics) e) Long camera opto-mech assembly late (awaiting optics) f) Principal Guider Camera assembly (Hare) IP g) Science Array controller fab (Burley) 95% compl. h) Short Camera drafting (Cleary) on sched. i) Filter procurement (Sutin) on sched. j) Grism procurement (Sutin) on sched. k) Motion control electronics design (Carr) 95% compl. l) MC fab. (Asa) 50% compl. m) Control software design (Birk) on sched. n) Instrument structure design (Gunnels) on sched. Project events in September: Coating development for Coll. and cameras completed at Spectrum TFL, coated optics now due in October. Latest construction images can be seen on the IMACS web site: http://www.ociw.edu/instrumentation/imacs See the new images of: Collimator lens and cell assembly Long camera/filter/shutter/dewar mechanical assembly Field lens and cell complete at OCIW First grating tilt mechanism prelim. assembly Principal Guider Camera prelim. assembly Optics (Sutin) 1) I am writing new specifications for the short camera aspheres. I have computed tolerances on the aspheric coefficients. We will re-bid them to REOSC, BF Goodrich (Danbury), and perhaps others. I have also contacted Dr. Jim Wyant (Mr. Interferometry) about discussing our specifications. 2) Spectrum TF has produced an acceptable coating, averaging 0.5%, with peaks up to 1%. We will take it. 3) Gunn Filters: no progress 4) Grisms: no progress. I just requested some calculations from Bruce Bigelow for the blank shape of the largest grism substrate. 5) Long camera at TORC: no progress. They were finishing up other jobs in the queue. We are now the major job, apparently. We will see... 6) Filter boxes: no progress 7) Center field guider checkout: just starting. I now need a guide camera from Greg Burley. Also, I intend to convert the spare computer into a guide camera computer. Electronics (Asa/Carr) Asa: Accomplished September: Filter Server 2 assembly: Complete. Center Field Guide Camera: Hard Limit added. Temporary test controls added. Electronics: Chassis #2 25% complete. To Accomplish in October: Filter Server 2: Test, and crate. Electronics: Complete Chassis #2. Guide Cameras: Finish design of Shack translation and stop brackets. Dewar: Specify motor driver for focus motor, continue design of focus limits. Carr: In Sept: - Selected sensors for temperature and pressure - Changed CFG schematics to update - Added new prox. sensors to modified SMS schematics For Oct. - Select motor and driver for CCD focus (replace Phytron motor from GL Scientific). Software (Birk/Clardy) Birk: During September, Bruce and I tested the PI DC-motors mounted inside the long camera barrel (long camera scale control). We were able to find the reference marker for each motor and measured the maximum travel to be about 5.5 mm (+/- 1 mm required). On my trip to LCO earlier this month I talked to Skip about the use of the serial hub. He was concerned about driver compatibility with future releases of Linux. He recommends the use of raw TCP/IP, utilizing a terminal server converting RS232 serial signals to TCP/IP. I investigated several products and ordered two of part ETS16P from Lantronix (one spare). It has 16 serial ports that are accessible over a single IP number. Clardy: No report this month. Detector Systems (Thomson/Burley) No report this month. Mechanics (Bigelow/Hare) Bigelow: In September: 1) C02 and C03 were successfully mounted in their cells 2) Design was completed for the CFG and long camera focal surface masks 3) The SMS was modified to carry the two new masks (CFG and LCAM imaging) 4) The first 100 slit masks were ordered from California Hydroforming 5) Quotes now in hand for two different slit mask cutting lasers 6) Preliminary mechanical assembly of LCAM, filter, shutter, and dewar 7) Collimator baffles designed, RFQ out for fabrication 8) Long camera baffle design started 9) Additional research into possible interferometer purchase For October: 1) Continue collimator opto-mech assembly (assuming lenses arrive) 2) Start Long Camera opto-mech assembly (assuming lenses arrive) 3) Finish Long Camera baffle design, order 4) Finish SCAM drafting checking, request fab quotation from M&T 5) Re-assemble modified SMS cassette and new masks 6) Start imaging mirror and grism cell design 7) SAC meeting in Tucson (10/6-7/01) Hare: Current Work * Minor rework and redesign of miscellaneous guide camera parts. * Parts fabrication for the Grating Tilt Mechanism near completion. Purchased parts have been ordered in preparation for assembly. * Design and drafting of the DSS latch subassemblies and clamp assemblies is now complete and under review. * Review of the design and drawing package of all remaining subassemblies of the Disperser Server continues. Future Work * Review design of Disperser Server and continue work on the solid models. * Continue revisions to solid models and part drawings of any subassembly as needed. * Assembly and testing of all guide cameras. * Design and build tooling to mount the Field Lens into its cell. * Fabrication of the second shutter. * Resume design work of the Calibration Unit. Fabrication (Kowal/Storts/Castillo/Ramirez) Kowal: September's Report: 1) Grating tilt mechanism (GTM) Base Plates are finished. 2) GTM Pillars have been modified and anodized. 3) Guider base plates are out for black cadmium plating. 4) GTM Trunions are being currently being final machined to fit bearings. 5) Collimator parts are in progress (Storts) Expectation's for September: 1) New Slit Mask parts. 2) Remainder of Disperser Server System. 8) Other Business Next meeting: 10:15, 11/7/01