IMACS progress report no. 17 B. Bigelow 1 September 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 drafting (Poteete) done d) Filter Server prototype fab. (Lalo) late finish e) Disperser Server Sys. mech. design (Bond) TBD f) Field Lens mech. design (consult) TBD g) Collimator mech. design (consult) TBD h) Slit Mask Server mech. design (Bigelow) on schedule i) Slit mask fab. development (Bigelow) late finish j) Dewar fab. (Luppino) on schedule k) CCD controller elec. design (Burley) on schedule l) Motion controller design (not assigned) delayed m) Instrument control design (Birk) on schedule a) Final design of the filter server is late, but should be completed this month. We hope to get the filter server back on schedule in the drafting stage, which starts this month. b) Drafting is delayed by late finish of mech. design - should be back on schedule this month. d) Late drawings delayed the start of fabrication. Lalo is making good progress - FSS prototype will be complete in early Sept. e) Mech. design of the DSS will be rescheduled this month, based on a new division of work between Bruce, Tim, and Tyson. f) Field lens mech. design will be rescheduled this month. g) Collimator mech. design will be rescheduled this month. h) Slit Mask Server detail design finished early, except for the mask mounting plate, which awaits designs from the guide cameras and field lens cell. i) Two laser-cutting shops produced acceptable slits cut in 0.020" aluminum, 0.020" carbon-fiber composite, and 0.005" steel in August. A final material selection will be made following final hydroformed mask prototypes in 0.006" stainless, 0.012" stainless, and 0.016" aluminum. 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: Tyson Hare, our newest mechanical engineer, started at OCIW on 9/1/99. Tyson joined us from DAO, where he was involved with several Gemini projects. A new schedule will be released this month, with Tyson picking up some of Tim and Bruce's design work, so that we can complete the opto-mechanical design work that had been assigned to consultants in the previous schedule. Tyson's office is 224, across from Dr. Searles office. The advertisement for the IMACS machinist position generated 36 applications. The qualified applicants were ranked, and interviews of the top six have been scheduled for September. We hope to have a new machinist on board by late October. In August, Gus Oemler (OCIW Director) cleared IMACS for final design using metric dimensions. Following some discussion of the pros and cons of a metric vs. imperial standards, we will be designing and documenting IMACS in metric units, with the exception of mountain-serviced interfaces where mixed tooling requirements were a serious concern. The project budget already included funds for metric tooling. 2) Optics (Sutin) 2.1) Spectronics now has an RFQ for replicating two gratings. One will be sent to Newport Thin Films for a coating of SilverStar. Spectronics will then measure both gratings and give us comparison data. If the overcoating is a real enhancement, then we will be able to overcoat all of our gratings to prevent tarnish, as well as gain a 6% increase in throughput. 2.2) Two gallons of Cargille fluid have been ordered as couplant. This should be enough for all the fluid gaps, testing, and many refills. Since Cargille does not exactly replicate the fluid on reorder, this fluid is not replaceable, so enough fluid is required for all time. 2.3) An RFQ is being negotiated with Ohara to measure the indices and dndT's of the Cargille fluid. Ohara is the only known company able to do these measurements (including Cargille). 2.4) Harland has started on the melt sheet update for the long and short cameras. If we decided to athermalize the designs also, then the melt sheet update will be delayed until the Ohara measurements of the coupling fluid are available. 2.5) Optovac says that our first CaF2 boules should be ready by mid- September. When the melt update is done, they will be given specifications for the generation, and if we are lucky, the CaF2 will not break. 2.6) I now have a theoretical model for Sol-Gel which matches the data to within measurement errors. A first draft of a document comparing Sol-Gel and dielectric coatings has been written. ------------------------------------------------------------------- TODO, September: 1) Baffle analysis 2) Make some decisions about coatings 3) Order glass for a test cell 4) Order test gratings for protected coating tests 5) Learn how to clean optics! 3) Electronics No report. 4) Software (Birk) 4.1) Version 0.2 of database and mechanical-GUI are working together. 4.2) Version 0.1 of the telescope simulator lets the user move the telescope to a position on the sky and display the visible portion of the sky as a star-map (SAO/GSC catalogs available, USNO catalog pending). It also stores the telescope position in the database for usr with other modules. 4.3) IMACS data-simulator (v0.1) reads status information (e.g. telescope position) from the database, creates simulated data from the star-catalog and writes FITS files to disk. 6) Mechanics Bruce: Mechanical design of the Slit Mask Server (SMS) is progressing on schedule. The mechanical design is nearly complete, except for the mask mounting plate, which awaits details from the guide cameras and field lens mount. Drafting will probably start early in September. Tim: Work on the prototype filter mechanism components has progressed in the following areas: 1) we have received the completed assembly drawings from Mary. 2) Estuardo (Lalo) has started work on the actual components. He estimated that it would take him a total of 40 hours for the entire assembly. 3) The last of the purchase parts for the assembly have arrived. All of the purchase parts are now here at Carnegie. 4) No quotes from outside shops have arrived as of yet; however, telephone conversations today indicated that they are on their way. Work on the rest of the filter mechanism is still ongoing. Dave Carr was given a list of all of the components that would be used for motion control. Gerry Luppino: A lot of progress to report from this end. I've been working extensively on the detailed design drawings. On the next email, you'll find a drawing list of the entire project. I hope to deliver these to you before I leave for ESO (in 10 days). Then I can invoice you for milestone #1. I have also been ordering parts. I have the SS bellows, the micrometers for the alignment fixture, and various other misc parts. I should get heavy into the fabrication once the drawings are complete. Everything is on schedule. 7) Detector Systems No report this month. 8) August Project Meeting (9/1/99) notes: Next meeting: 10:15 AM, 9/29/99, new conference room Action Items: 8.1) Dressler to meet with Birk regarding GUI layout 8.2) Bigelow to check availability of Darrel for electronics tech. 8.3) Ian reported the following: - First images from the OCIW guide camera prototype - The Keyence sensor for aligning CCD's is in house - The motion stages and laminar flow bench are due this month - We now have 9 of our 12 CCDs from SITe - Space in the electronics lab has been allocated for IMACS