IMACS progress report no. 30 B. Bigelow 2 October 2000 1) Project Status Currently scheduled tasks: Status: a) Disperser server (DSS) design (Bond) progressing (4 mo. behind sched.) b) DSS drafting (Meyers) in progress c) DSS fabrication in progress d) Field lens mechanics (Hare) started e) Mask server integration (Asa) on sched. f) Coll. fabrication (Danco) due 10/25 g) Long camera mech. design (Bigelow) on sched. h) Dewar fab. (Luppino) late (now due end of Oct.) i) Science Array controller des (Burley) 90% complete j) Science Array controller fab (Burley) 80% complete k) Motion control (MC) electr. design (Carr) due end of Nov. l) MC fab. (Asa) delayed m) 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 2) Optics (Sutin) Current state of the IMACS Optical Elements: Collimator C01/Field Lens At Newport TFL, waiting for complete set of optics C02 At Newport TFL, waiting for complete set of optics C03 At Newport TFL, waiting for complete set of optics C04 At Newport TFL, waiting for complete set of optics C05 (CaF2) At Spectrum TF, waiting for L05 Long Camera L01 At OCIW, waiting to be driven to Newport TFL L02 At Newport TFL, waiting for complete set of optics L03 (CaF2) At TORC, in final polish (not critical path) L04 At TORC, has final pickup surface, awaits L05 L05 (CaF2) At TORC, in final polish (est deliver 10/18) L06 At OCIW, waiting to be driven to Newport TFL Short Camera S01 Material at OCIW, awaiting fabrication quote S02 (CaF2) Current source uncertain (Schott?, Russian?) S03 (CaF2) Material at OCIW, awaiting fabrication quote S04 Material at OCIW, awaiting fabrication quote S05 (CaF2) Material at OCIW, awaiting fabrication quote S06 Eliminated from design S07 Material at OCIW, awaiting fabrication quote S08 Material at OCIW, awaiting fabrication quote S09 Material at OCIW, awaiting fabrication quote Sundry DW1/Dewar Window At Newport TFL, waiting for complete set of optics Clear Filter/Long Material ordered from Ohara Clear Filter/Short Material ordered from Ohara Other Stuff: 1) Raytheon quoted on the two short camera aspheres. The quote was out of budget. We will try to iterate with them on specifications. 2) Most of the details of the TV guiders have been decided. All the parts are ordered or here, except various slit and S-H masks. 3) The shutter size was re-computed. Apparently the existing shutter is large enough. 4) The SAC has little feedback for the initial filter complement, so filter ordering will commence in October. 5) A CaF2 test blank was ordered for Bruce for mechanical testing. It won't be clear, at least in the optical. 6) Schott says that they are checking if they have material for our missing CaF2 before they will quote. Almaz (Russia) will deliver inferior material for a low price. We are considering obtaining the inferior material now just in case. Optics TODO List: 1) Baffle analysis, baffle materials 2) Filters 3) Electronics (Carr) Dave left OCIW at the end of September. He is scheduled to complete the IMACS motion controller schematics on a consulting basis by the end of November. 4) Software (Birk/Clardy) Birk: Filter-Server: ============== a) I measured the time to change a filter: 8-16 sec These number might increase when the filter-server is fully loaded and moving vertically. b) Self-Test: (takes about 5 min) - find fiducial and check position of limit-switches - insert all 15 filters in random order c) long-term test 1): 7 hrs (~1400 filter changes) 2): 6 hrs (~1150 filter changes) I found just a few small problems: 1) position of position-sensor not very well defined (B) or not in optimal position (A) 2) filter-holder handles scratch against insert mechanism Joe is working on a solution to both problems. Shutter: ======== I worked on the ASCII (serial port) interface for the shutter and wrote a test-GUI that allows opening and closing of the shutter at various speeds. The timing of the exposure time is done by the host-computer. This limits the precision of the exposure time to about 50 ms. Dave will build a micro-controller that will allow very precise timing (< 10 ms). We also are preparing a setup to measure the exposure time along the axis of the shutter. Over two days I run the shutter through 4200 exposures without any problem (blade-A shows a little more friction than blade-B). Magellan-Interface ================== I contacted Skip Schaller and we defined a protocol (TCP/IP) to control the Magellan telescopes and retrieve information about its status (e.g. position,focus). At this point there is no interface to the guiders but Skip is aware that we need one. USNO/GSC guide star catalogs ============================ I used the geometry of the accessible fields of the IMACS guiders ('Principal Guider' and 'SH Sensor') to test the HST-GSC and the USNO-SA2.0 guide star catalog: 0 h <= R.A. < 24 h , < -85 deg <= DEC <= +40 deg HST-GSC: 4911 fields checked (1662 empty) -> 34% empty USNO SA2.0: 10646 fields checked ( 199 empty) -> 2% empty PLEASE NOTE THAT THE NUMBERS ABOVE HAVE CHANGED DUE TO THE CORRECTION OF A GEOMETRY ERROR 5) Mechanics (Bond/Hare/Bigelow/Luppino) Bond: The remaining parts for the second filter server have all been ordered. When they arrive, we will be able to assemble (and test). We are changing the valves to the same ones that were used on the mask stage. All of the parts for the grating tilt mechanism have been ordered. The last of the red-lined drawings are back with Julie. We should have these back shortly including all of the assembly drawings as well. Work has progressed on the DSS carousel mechanism solid models and should be wrapped up within days. These models will then be given to Julie for drafting. The next month will be spent on the remainder of the disperser server mechanism. Hare: Camera Shutters: 1. Software development for shutter motion profiles began this month. Good results were obtained with basic motion control of the shutter blades. Simple tests equivalent to 4500+ exposures revealed no significant problems in shutter operation. 2. Future work includes disassembling the shutter and examining wear patterns, anodizing shutter components, further operational tests, and continued software and electronics integration. IMACS Guide Cameras: 3. The solid models for all cameras, including the design for mounting all optical elements for each camera, are completed. Revisions to the models continue to be made as needed. 4. The drawing package for the Shack-Hartmann Guide Camera is complete. This package will be reviewed and red-lined as necessary. The drawing package for the Principal Guide Camera is to be prepared this month. 5. Future guide camera work for the month of October includes continued design, development, and manufacturing of the three guide cameras. Purchased parts will be ordered over the next month. IMACS Field Lens: 6. Work on mounting the Field Lens has begun. Preliminary design issues are being investigated. Bigelow: SMS: The slit mask server shuttle and transfer mechanisms have been assembled and testing started at the end of September. The two subsystems will be assembled together on an optical bench, and further testing will continue in October. Prototype slit masks are currently late from California Hydroforming, but are expected in early October. Collimator: The collimator mechanics are in fabrication at Danco in Santa Clara. They are due at OCIW at the end of October. Long Camera: Design and analysis of elastomeric mounts for the long camera elements continued through September. Mounting designs have been completed for each of the 6 lenses, and analyzed for gravity, thermal, and hydraulic (oil pressure) loads. In 4 of the six lenses, the tight deflection allowances were met (+/- 5 micron translations, +/- 2 arc-sec tilts). In 2 cases, the peak tilt errors were 3 arc-sec, but these are compensated by the better than required residual errors in the remaining lenses. Mechanical designs for the cells, scale/focus control, and barrel started in September, and are scheduled for completion in October. This work will likely run at least a couple of weeks late due to unscheduled time spent on the elastomeric designs. Gerry Luppino: No report this month. Bigelow will meet with Luppino at IfA in October for acceptance testing of the dewar. The dewar should be at OCIW by the end of October. 6) Fabrication (Kowal/Storts) Kowal: 1) Programmed all titanium parts for DSS drive shaft supports 2) Programmed, ran, and assembled all parts for 3 grating cells. 3) Researched titanium speeds and feeds for grating parts 4) Ordered CP titanium for grating parts 5) Ordered specialized tooling for titanium parts 6) Assisted trouble-shooting of FSS 7) Fabricated assembly jig for slit mask frames 8) Assisted assembly of slit mask server 9) Developed time and cost estimates, and layout for material room renovation 7) Detector Systems (Thompson/Burley) Detector systems progress (Sept 2000) Guider cameras: 1 - one of the guider cameras was used to take the Magellan first light images. 2 - testing of the guider cameras at the telescope revealed a few problems. (a) The serial link needs to be made more robust, as data errors occurred occasionally when the dome was moved. A second PCI card had troubles initializing the camera over 100m of cable. (b) there is a gradient in the image background, and some horizontal streaking that need to be addressed. 3 - one of the guider cameras was tested with the electronics inside grounded to the case. The herringbone pattern noise attributed to the switching power supplies disappeared -- this has been a nagging problem, so it is very satisfying to make some progress on this one. 4 - some lab testing was done to address the serial link problems with long data cables. Changing the cable terminations to 100 ohm (from 120 ohm), and reprogramming the Altera chip on the PCI card to optimize for speed looks to have made the link much more robust. Three formerly flakey PCI cards now work error-free with 80m of cable. 5 - seven more CCD47-20 chips have been ordered. Mosaic cameras: 6 - sent out the rigid-flex preamp boards to be manufactured. 7 - sent out the thermal isolation cable for the SITe chips to be manufactured. 8 - all of the parts for the lab test dewar are ready to be assembled 8) Other Business Next meeting: 10:15, 10/25/00, new conf. room.