IMACS progress report no. 18 B. Bigelow 6 October 1999 1) Project Status Currently scheduled tasks: Status: a) Filter Server mech. design (Bond) late finish b) Filter Server drafting late start c) Filter Server prototype fab. (Lalo) done d) Disperser Server Sys. mech. design (Bond) resched. e) Field Lens mech. design (consult) resched. f) Collimator mech. design (consult) resched. g) Slit Mask Server mech. design (Bigelow) on schedule h) Slit mask fab. development (Bigelow) late finish i) Dewar fab. (Luppino) on schedule j) CCD controller elec. design (Burley) on schedule k) Motion controller design (not assigned) delayed l) Instrument control design (Birk) on schedule a) Final design of the filter server is late, but should be completed in early October. We hope to get the filter server back on schedule in the drafting stage. d) Late drawings delayed the start of fabrication. The prototype was successful and will be duplicated. d) Mech. design of the DSS will be rescheduled this month, based on a new division of work between Bruce, Tim, and Tyson. e) Field lens mech. design will be rescheduled in Oct. f) Collimator mech. design will be rescheduled in Oct. g) Slit Mask Server detail design finished early. The design goes to drafting in mid Oct. h) A final material selection will be made following final hydro-formed mask prototypes in 0.006" stainless, 0.012" stainless, and 0.016" aluminum. i) Dewar design phase 3 is slightly behind schedule. Drawings for phase 3 are due in Oct. l) Electronics design for the FSS motion control electronics has been started by Dave Carr. Parts will start being ordered in mid Sept. A prototype motion control system should be operating by the end of the year. Other project progress: A machinist was selected at the end of September. A job offer is in progress to the top candidate. We hope to have the new machinist on board by the end of October. His first task will be to start the search for a vertical machining center (CNC mill) for IMACS. The project schedule revision should be released this month with the new work assignments for Bruce, Tim, and Tyson. 2) Optics (Sutin) Optics: 2.1) A grating has been ordered from Spectronics to test the efficiency of better coatings on gratings. 2.2) The couplant arrived fom Cargille. A sample has been sent to Ohara for index measurement. 2.3) Indices of refraction have been ordered from Ohara for the collimator and long camera glass up to 1.5 microns. 2.4) If focus is compensated at the detector, then the collimator will not need any internal thermal compensation. 2.5) All of the Ohara glass blanks have been measured and weighed except for one extremely heavy blank in the short camera. No surprises. 2.6) Harland Epps has produced several thermally compensated and thermally uncompensated versions of the long and short cameras. We are still iterating. 2.7) We have delivery dates for all of the Optovac CaF2, and all the dates are in this year. They have the generating specifications for the collimator boule now, and will get specs for the long camera boules next month. 2.8) The grunge on the direct imaging mirror did not clean off. It was sent back to Newport, and they are re-coating. The possible reasons for the coating being scratched up are farfetched. ------------------------------------------------------------------- TODO List: 1) Choose melt versions of cameras 2) Baffle analysis 3) Make some decisions about coatings 4) Order glass for a test cell 3) Electronics Parts are being ordered for the filter server prototype. The FSS prototype electronics should be ready for integration with the mechanics and software at the end of the year. 4) Software (Birk) 4.1) USNO-SA2.0 catalog analyzed: no 10'x10' field without any star 12 12 hours) done. 4.3) started on low-level mechanical GUI (includes status display for limit-switches, fiducials, individual motor/encoder/solenoid position). 6) Mechanics Bruce: Mechanical design of the Slit Mask Server (SMS) is on schedule. Designs go to drafting in mid October. Tim: The filter mechanism prototype stage was completed by our shop. We are still waiting for one more quote from outside shops for comparison purposes, and as a potential candidate for fabrication of the second stage. A small review of the prototype stage was held with Charlie (Hull), Tyson (Hare), Bruce (Bigelow), and myself. Many constructive and insightful comments were made and the hope was that some of these suggestions would be implemented in future designs. All of the solid models for the rest of the filter server are essentially complete. A package is being put together for Mary (Poteete) for drafting, and should be ready by the end of next week. As well, all of the purchase parts will be ordered by the end on next week. This should leave most of October available for me to work on optomechanics. Tyson: 1. The current shutter motion specifications (minimum exposure duration of 1 sec with 1 % linearity) has raised the issue of shutter actuator type. Preliminary design suggested that air cylinders would be an appropriate actuator, however further investigation has revealed possible shortfalls in performance ability of pneumatic actuators to meet these specs. Other types of actuators, including DC stepper motors, and alternate shutter designs are being explored. Discussion with designers of shutters on other instruments is being pursued. 2. An increase in the optical footprint dimensions prompted by requests to provide for the quick guider (512 * 2048) CCDs and allow for a rotating CCD assembly has resulted an increase in the aperture dimension and overall shutter dimensions. Space constraints are being investigated, and new optical barrel mounting points may be necessary. 3. A file server of adequate performance for IMACS needs can be purchased for approximately $1400. This estimate is based upon quotes obtained from 5 sources. 4. Methods of document and revision control for Mechanical Desktop drawing files is currently being investigated. A control system should be in place by the end of October. Gerry Luppino: I am disappointed that I have not sent you the completed detailed design drawings yet. These have proven to be a lot more work than I'd appreciated. The drawing list I sent you last month has been slightly revised (some drawings merged, some eliminated, some new ones, etc.) and I'm plugging away. I hope to get you a stack of paper in a week or two. In the meantime, I have received the material for the Z-drive and the various bits and pieces are either here or on order. I'll be going out to fab the Z-flexure soon. Jeff Douglass has the detailed FEA of this design completed and it will be included in the stack of drawings I send. With the addition of stiffening braces on the sides of the flexure, the motion of the focal plane due to flexure is sub-micron for any orientation. Look for the drawings soon. 7) Detector Systems (Thompson/Burley) 7.1) we have 11/12 SITe CCD's and 4/6 (ordered) GEC guider science grade CCD's 7.2) Greg is working on the array electronics layout 7.3) Rob is making a second prototype housing, and when that is OK we will make a large number of housings. 7.4) testing the science grade guider CCD's will begin when we get the housings 7.5) the Keyance displacement sensor ahs arrived, we are waiting on the laminar flow hood and the precision stage 8) September Project Meeting (9/29/99) notes: Next meeting: 10:15 AM, 10/27/99, new conference room In the future, we will try to hold the monthly project meetings on the last Wednesday of the month. Virtually all points discussed in the meetings are contained in the respective reports, with the exception of action items as follow: Action Items: 1) Tim and Dave Carr to meet regarding final details for the FSS electronics 2) Christoph and Dave to meet and finalize hardware and firmware commands for FSS in October. 3) Bruce to check on availability of CCD alignment tooling for the end of 1999. 4) Alan directed that the designs for the short and long cameras can diverge as necessary to accommodate different aperture geometry.