IMACS progress report no. 19 B. Bigelow 2 November 1999 1) Project Status Currently scheduled tasks: Status: a) Filter Server mech. design (Bond) late finish b) Filter Server drafting late start c) Long cam. prelim. mech. design (Bond) on schedule d) Shutter mechanical design (Hare) on schedule e) Collimator prelim. mech. design (Bigelow) on schedule f) Slit Mask Server drafting (Poteete) on schedule g) Slit mask fab. development (Bigelow) late finish h) Dewar fab. (Luppino) on schedule i) CCD controller elec. design (Burley) on schedule j) Motion controller design (Carr) started k) Instrument control design (Birk) on schedule a&b) Final design of the filter server is still running late, due to interference problems. Tim plans to have it finished in the second week of November. Drafting will start ASAP. d) Solid models are in progress. e) Field lens mech. design will be rescheduled in Oct. f) Slit masks drafting started on schedule in Oct. An early finish is expected. g) See mechanics update. Other project progress: Project Machinist: Vince Kowal (vink@ociw.edu), our new CNC programmer/machinist, started on 10/25. Vince comes to us from Kap Mfg. Corp. in Baldwin Park, where he was a machinist/programmer. Vince has several years of Mastercam programming experience, and has fabricated close-tolerance parts for a variety of aerospace programs. He has already found and initiated the purchase of a 1997 Haas VF4 vertical machining center, which will be used primarily for IMACS for the next two years. Vince is also coordinating the purchases of the software, computer, and shop furniture which ultimately comprise the IMACS fabrication facility. Vince scheduled a demonstration of the Mastercam software on the Servo 6000 CNC machine to prove compatibility. The demo was successful, and lead to the purchase of two seats of the Mastercam software. Project Schedule: The project schedule revision was completed in October. A revised copy of the schedule is on my door, and copies are available on request. The main changes were to redistribute the mechanical design tasks between Bruce, Tim, and Tyson. We remain on schedule for commissioning of the instrument at the end of 2001. 2) Optics (Sutin) Optics: 2.1) The grating ordered from Spectronics to test the efficiency of better coatings on gratings arrived at Newport Thin Films. 2.2) The coating on the direct imaging mirror must have been damaged either in OCIW's receiving, or by someone who removed it from the IMACS cabinet. The unknown culprit got a fingerprint on it, and then tried to rub it off. Newport is recoating the mirror in the same run as the test grating. 2.3) The index of the Cargille couplant has been measured by Ohara over the thermal operating range of IMACS. 2.4) Indices of refraction for the collimator and long camera glass up to 1.5 microns have arrived from Ohara. The results have not yet been analyzed. 2.5) The long camera melt has been finished, and the final specifications and glass have been sent to TORC. The CaF2 for the collimator and long camera should either have arrived at TORC, or should arrive next month. Performance of the construction long camera meets or exceeds the pre-construction design. 2.6) Harland Epps has produced thermally compensated and thermally uncompensated versions of the short camera. A sensitivity analysis of the thermally compensated version was computed and given to the engineers, so that they could decided if they could build a cell. 2.7) The field lens should arrive next month from Contraves. They are now in final testing. TODO List: 1) Choose short camera version 2) Make some decisions about coatings 3) Baffle analysis 4) Order remaining gratings 3) Electronics (Carr) Electronic components for controlling the filter server have been ordered, and many parts are now in house in the IMACS electronics cabinet. Dave may not be able to complete the fabrication and programming by the mid December deadline. Additional electronics help of a couple of weeks could make the controller ready in time. 6) Mechanics Bruce: Slit Mask Server: The SMS drawing package was sent to Mary Poteete on schedule in October. Parts ordering will happen in November. Slit Masks: Additional hydro-formed prototype masks in 0.005" and 0.010" stainless steel (SS) and 0.012" aluminum were delivered in October. It appears that both the 0.010" SS and 0.012" aluminum masks will be acceptable, with the SS masks offering a better-matched CTE and faster laser cutting times. A method for putting a black, absorptive coating on the SS masks needs to be found. Tim: 1) Revisions were completed for the filter server prototype drawings. 2) Drawing packages were sent to the Univ. of Michigan and Foster Inc. in Victoria. 3) Filter Server System (FSS): Several significant interferences were identified and the mass budget was exceeded. As a result, I spent much of October correcting the interferences and removing mass to meet the budget. 4) Finalized selection of the air valves from Clippard - enough have been specified to complete the FSS, and we will test these to see if they will be acceptable for the rest of the instrument. Tyson: Camera Shutters: 1) The shutter design has moved into the solid modeling stage. Discussions with other shutter developers from Keck, NOAO, and UH/IfA have led to the current design which includes the use of cylindrical style linear motors as the shutter blade actuators. A shutter blade locking mechanism is an outstanding issue to be resolved. Possible suggestions include the use of magnets to hold the blades in position when the motors are powered down, as in the filter server mechanism, but space constraints are proving to be a difficult limitation. 2) Motion control and motor electronics issues will now be examined in detail. 3) It is expected that the solid models will be completed in two weeks. IMACS file server: 4) Informal discussions between Bruce, Tim, and Tyson have resulting in agreement for the purchase of a machine as specified in last month's report. The machine should be available by next month. Gerry Luppino: October was a good month. I delivered the detailed design drawings in a large package on Oct 18. They are complete for the most part, although a few items will need further detailing as the design progresses. I attempted to address all requests (truss design, handles, etc.). The fabrication has begun for the camera head backplate and some of the internal components. Also, the color of the camera will be BLUE. I hope this is acceptable. During November, fabrication will continue on the various Z-stage parts. I will also attempt to fabricate the alignment jig as soon as possible so it can be tried out at OCIW. Finally, the Polytec/PI XY stage and controller have arrived and have been unboxed. They look fine and there are no surprises with the stage (the PI drawings left a lot to be desired, and there was some uncertainty about how to mount this thing). 7) Detector Systems (Thompson/Burley) Detector systems progress (Oct 1999) ==================================== Array cameras ------------- 7.1 - the pcb layout for the signal processing board is complete (ie 100% routed). Some minor cleanup is needed. 7.2 - the pcb layout for the clock driver board is nearly complete. Some work on power planes + minor cleanup is needed. 7.3 - the pcb layout for the dsp board is complete. Some updates need to be merged into the design. 7.4 - the current board size is 5.0 x 7.0 inches. After the power board layout is further along, we may want to re-size the boards to something like 4.5 x 6.5 inches, better to fit into the IMACS space. 7.5 - started the backplane and power board layouts. 7.6 - we've been discussing the use of cryotigers on the telescope. The main concerns are how far away the compressor can be located from the cooling head, where the compressor might go in the building, and how to get rid of the heat generated by each compressor (500W). According to the cryotiger rep, the max length of rigid copper line is 100 feet, less if we use the super-flex cable. There is a new gas mixture under development with 80 watt cooling capability -- we should keep an eye on this. Guider cameras -------------- 7.7 - the revised guider camera housing has been assembled with all the circuit boards, and looks good. Robert has started to make 30 copies on the CNC mill. The housing will be anodized black. 7.8 - the guider camera boards built by Matt MacPherson have all been functionally tested. There are only a few DSP and clock driver boards which need further work. 7.9 - the GTC project in Tenerife has enquired about the possibility of modifying our guider camera design for their telescope. 8) Software (Birk/Clardy) Christoph: During October I continued on the low-level mechanical GUI. This GUI displays all encoder values, every limit-switch, status of each fiducial and all sensors (temperature, pressure and proximity). It contains all knowledge necessary to avoid collisions. It also has a TCP/IP command input to allow for sophisticated testing of all components. 9) Meeting notes from 11/2/99: Action items: a) Next meeting: 10:15 AM, 12/1/99, new conference room b) Bruce to check on availability of Darrel's time for FSS electronics c) Alan to produce a 1 page document describing IR camera plan for IMACS d) Bruce to consider IMACS cable wrap and cable lengths e) Brian to produce a summary document describing our choice of hard AR coatings f) Bruce to provide dates for when as-built dimensions of lenses are required for the collimator and long camera cell fabrication g) Bruce to provide dates for when finished, coated optics are required for integration with the cells