IMACS progress report no. 20 B. Bigelow 1 December 1999 1) Project Status Currently scheduled tasks: Status: a) Filter Server drafting late start b) Long cam. prelim. mech. design (Bond) late start c) Shutter mechanical design (Hare) finished d) Collimator prelim. mech. design (Bigelow) on schedule e) Slit Mask Server drafting (Poteete) on schedule f) Slit mask fab. development (Bigelow) late finish g) Dewar fab. (Luppino) on schedule h) CCD controller elec. design (Burley) on schedule i) Motion controller design (Carr) started j) Instrument control GUI design (Birk) finished a) Final design of the filter server finished in November, and all design files have been passed to Mary for drafting. c) Mechanical design finished in November, and Tyson will be doing the drafting in December. e) Slit masks drafting is in progress and should finish in early Dec. g) See mechanics update. Other project progress: New CNC vertical machining center: Our new project machinist, Vince Kowal, located a lightly used Haas VF4 vertical machining center in early November. Minor changes in electrical services and air plumbing were made to our shop, and the machine was installed in late November. A new PC, Mastercam software, and an initial complement of tooling were all ordered and mostly received in November. The first parts should be coming out of the VF4 in early December. Our first generated CaF2 element (collimator element #5) was shipped to TORC in November. The second CaF2 element has been generated and delivered as well. Specifications for the short camera CaF2 elements are due to Optovac by the end of the year. Project Schedule and Budget: With a few minor exceptions, we remain on schedule for commissioning the instrument at the end of 2001. We are currently on budget, with approximately $1.3 million of the $4 million instrument budget spent as of 10/31/99. 2) Optics (Sutin) Optics: 2.1) The grating ordered from Spectronics to test the efficiency of better coatings on gratings has been coated by Newport Thin Films. 2.2) The direct imaging mirror has been re-coated by Newport Thin Films, and has arrived at OCIW. 2.3) The field lens from Contraves is going to be at least two weeks late. They are still doing final testing. The field lens is not a critical path item. 2.4) The CaF2 element from Optovac arrived at TORC 5mm too thick over spec. This was more material to remove by grinding than TORC was willing to deal with. Fortunately, the element as designed was a bit thin, so the collimator design was fudged by Epps to allow a thicker CaF2 element, which should also be easier to support. Optovac has been alerted that this was OK, but also that they should try not to make the same error on the CaF2 for the cameras. Consequently, the first long camera CaF2 element was generated 0.5mm over thick and delivered to TORC. 2.5) The decision has been made to avoid soft Sol-Gel coatings and use dielectric coatings. The performance characteristics are similar on average, but the handling characteristics of Sol-Gel are a big disadvantage. 2.6) We changed the diameter of the dewar window to be large enough to accept a standard o-ring, resulting in a dewar which is much less likely to leak. The material for the new size has arrived from Dynasil and is being shipped to TORC. 2.7) The 300 lines/mm grating and one of the 1200 lines/mm gratings were ordered. Also ordered was a 300 lines/mm echellette grating for use at 6th order, observing Halpha. This last grating was paid for by Ray Weymann. TODO List: 1) Choose short camera version 2) Make some decisions about coatings 3) Baffle analysis 3) Electronics (Carr) No report this month. 6) Mechanics Bruce: Slit Mask Server: Drafting is still in progress, and the first 36 detail drawings are currently being checked. Drafting should be complete by mid December. All purchased parts, except for air hose and fittings, were ordered in November. Slit Masks: Methods for applying a black, absorptive coating on the slit masks are being investigated. Collimator: Finite element models for each of the collimator lenses were produced in November, to determine how sensitive the element figures were to point supports. In all cases, the lenses can be adequately supported at 12 points around their circumference (considering gravity and coupling oil pressure loads). A flexure-based lens cell concept was developed, and finite element models including the lens and cell were generated. The cells were shown to limit all deflections to 5-10 microns including gravity, thermal, and oil pressure loads. Error allocations are being developed to guide the specifications of the lens supports. Tim: 1) All of the purchase parts required for the filter server mechanism have been ordered and are expected to be here before the Christmas break. 2) All of the solid models for the filter server mechanism are with the drafter (Mary P.). They are to be completed immediately following the drawings of the mask server mechanism. 3) Several of the solid models have been exported to Vince in the shop where he has imported them into MasterCam and is developing the tool paths required for machining of these parts. This should allow him to get started on the parts even if the drawings are late getting back to us. 4) The sensitivity analysis for the mounting of all of the optomechanics is again being studied in an effort to try to develop some sort of error budget. 5) Work was started on the calculations required for mounting of the elements in an elastomeric cell. 6) Work was started on a drawing revision control and numbering scheme. Tyson: Camera Shutters: 1. Completion of the camera shutter solid models led to a design review held on November 29, 1999. This review resulted in many constructive comments which are to be incorporated into the design. 2. It is expected that all revisions will be completed by December 3, 1999, at which time part ordering and drafting can begin. Part orders and final drafting should be complete before the Christmas break. 3. Camera shutter manufacture could tentatively begin the January 2000. 4. Motion control and motor electronics issues are to be discussed with electronics and software engineering. 5. The IMACS File Server has been ordered and should arrive by the end of next week. Gerry Luppino: Some reasonable progress has been made on the XYZ stage and focal plane mounts. - The G10 focal plane trusses are completed - The camera back plate is out at the shop and due here any day - The Titanium flexure is out for quote. - All materials are in hand for the other components - All parts for the Z-drive are in hand - We took delivery of the PI XY piezo stage and it has now been carefully inspected and there are no big surprises in how it will be mounted to the Z-stage. - The lemo connectors included with the PI stage are ideal for feeding through the camera backplate. We will need to decide where to bring these cables out of the camera and add the holes to the backplate. Work on the other components is underway. It is expected that this portion of the fabrication will be completed by the end of January. 7) Detector Systems (Thompson/Burley) Detector systems progress (Nov 1999) ==================================== Guider cameras -------------- 7.1 - we've assembled and started testing the first guider camera with the proper EEV chip (at room temperature). The first images look good, and show that the chip has almost no defects. 7.2 - updated the linux device driver (to kernel 2.2.x). 7.3 - the CAD design files are now on the web site. Array cameras ------------- 7.4 - the configuration of the controller was revised to fit into the space available between the dewar and the IMACS filter server. 7.5 - the circuit board size will be reduced to 4.6 x 6.5 inches to fit into the revised space available. 7.6 - the circuit board layouts are on-going. 8) Software (Birk/Clardy) Christoph: During November I finished alpha versions of both high-level (MechGUI) and low-level (EngGUI) mechanical GUIs for IMACS. Both GUIs include the necessary logic to avoid collisions. They also have a TCP/IP interface for external control. Each GUI stores the status of all elements in a common database that allows both GUIs to display the actual status of IMACS. The attachments show pictures of each GUI. 9) Meeting notes from 12/1/99: Action items: a) Next meeting: 10:15 AM, Thursday, 1/6/00, new conference room. b) Greg to provide revised array controller schedule by 12/31/99. c) Brian to produce coating selection document by 12/31/99. d) Brian and Alan to produce specifications for AR coatings. e) Alan to produce a summary of potential IR capability for IMACS by 12/31/99.