IMACS progress report no. 11 B. Bigelow 2 March 1999 Mechanics Objectives for February: Status: Done A. Complete all disperser server prelim. design (TB) I.P B. Complete prelim. guider mechanical layout (TB) Done C. Complete MOSS and instrument housing prelim. design (BB) Done D. Let contract to Alan Schier for optics supports (TB) Done E. Start PDR meeting arrangements (BB) Mechanics Objectives for March: A. Complete prelim. guider mechanical layout (TB) B. Complete prelim. filter-changer layout (TB) C. Complete prelim. FEA of instrument structure (BB) D. Complete prelim. MD3 model for IMACS (TB/BB) E. Produce prelim. motion control schematics (BB) F. Complete preparations for PDR (BB/TB) Optics report from Sutin, Detector systems report from Burley, dewar report from Luppino, and camera report from Schier attached. I) Project scope, budget, and schedule The IMACS PDR is now one month away. The final review committee includes D. Fabricant (chair), J. Nelson, S. Vogt, M. Radovan (Lick), P. Hastings (UK ATC), S. Roberts (DAO), and M. Johns (OCIW). The review will be held on Saturday, April 3rd, from 9 AM to 5 PM, in the new conference room at OCIW. A second PDR meeting was held on 3/1/99, to make sure that everyone is on target with review materials and preparations. The review document is scheduled to be sent out on 3/22/99, in order to give the reviewers time to study the material before the 3rd. Final versions of text and figures are due 3/18/99. II) Mechanics From Tim: The the concepts for all of the disperser mechanism are complete, and most of the solid models are complete. pulling all of these components into a final single assembly is still to be done. As well, the write-up for this is still to be done. As planned, these will be completed by March 18. The concepts for the guide cameras are complete, and the solid models are approx 1 day from completion. A write-up is still to be done. As planned this will be completed by March 18. Several meeting with Alan Schier have occurred, and work on the barrels is progressing well. No work has been done on the shutter, but Alan feels that he will only have a few days work of work to do for completion. In summary, Alan feels that there should not be a problem having all of his work to us in two weeks (March 16). Work on the filter selector is about to begin, and is planned to be complete by March 18. From Bruce: The preliminary design for the instrument housing is complete, except for minor details regarding the openings for the slit-mask handler, disperser server, and long camera. A preliminary design for the main optics support structure (MOSS) was completed, and a finite element model for the entire instrument structure was started in February. Preliminary results from the FEA will be ready for the PDR. Preparations for the PDR are well underway. Lodging arrangements for the reviewers are complete. The time, date, and location for the PDR are set. The outline for the PDR document has been accepted by the project team. Compiling, editing, assembling, and mailing of the PDR document will consume a substantial part of Bruce's time in March. We are on schedule to have all the preliminary mechanical design ready for the review on April 3rd. III) Electronics No effort on instrument electronics for February. Dave will provide the instrument electronics sections for the PDR. IV) Software Christoph Birk is developing motion control and data-taking software for IMACS and DDI (Magellan IR camera/spectrograph). He will provide the instrument software sections for the PDR. V) Optics Via Brian Sutin: 1) The final guider details have mostly been worked out, in parallel with the initial engineering. 2) The field lens is next in the queue to be generated at Contraves. 3) The direct-imaging fold mirror and dewar test window have been sent to TORC for figuring. 4) An RFQ has been sent to Coherent and Cleveland Crystals for coating designs. No response as yet. 5) A request for a cost estimate and drawing for 6.5" etalon from Queensgate has been sent. No response as yet. 6) Schott quoted on two of our CaF2 blanks, at reasonable prices. A request for a quote including generation was returned. No response as yet. ------------------------------------------------------------------- TODO, March: 1) Lots of PDR stuff. 2) Start thinking about filters. 3) Set up system for taking ANSYS flexure output and returning optical performance degradation. 4) Think about Shack-Hartman calibration, if any. VI) Guiders and CCDs Via Greg Burley: Guider camera progress (Feb 99) ==============================+ 1- the high speed serial link works in loopback mode now. That is, the PCI interface to the guide camera computer is basically functional. I've updated the linux device driver, debugged the code programmed into the Altera EPLD, installed the FIFO and the LVDS drivers/receivers on the PCI card. In loopback mode, data gets written out from the PCI bus, serialized in the Altera chip (with a frame sync), and transmitted by the line drivers. It loops back to the receive side, gets de-serialized, stuffed into the FIFO, and read by the PCI bus. The last step is to program a counter into the EPLD that counts the number of data words waiting in the FIFO. 2 - revised the guider camera web site. It now includes the guider camera schematics (.pdf format) and a few digital photos, among other things [www.ociw.edu/~burley/ccd/guider.html] 3 - collectively, I think we sorted out the function of the guide camera computer, and its place in the larger scheme. Mosaic camera progress (Feb 99) =============================== 1 - started the mechanical design of the 4Kx4K dewar, which will likely be the lab test dewar design. 2- met with Keyence to check out their LK series displacement sensor, which we were thinking of using to measure the flatness of the mosaic -- this is the ($5K) less expensive version. It didn't work at all on either a SITe 2Kx4K, or 2Kx2K chip. The sensor is supposed to work by triangulation -- it bounces a laser off the surface of the chip, then measures the position of the reflected beam. But, we discovered that the sensor couldn't see either SITe chip. There wasn't enough reflected light from the laser spot for the sensor to figure out where the chip surface was -- it could only get sporadic readings from the dust on the chip surface. As it stands, we know the LT (confocal microscope) sensor works, although it is expensive. There will also be a high-sensitivity version of the LK series available soon, which we can test when it becomes available. 3 - started preparing for the IMACS PDR VII) Dewar/CCD Mosaic Via Gerry Luppino: IMACS dewar design is underway (in a big ugly way!). CCD detailing is nearly completed. I am now fiddling with the details of the focal plane mounting which should be completed soon. I have shifted gears from the internal detailing to the external parts to give feedback to Carnegie about the envelope of the instrument. I should have preliminary external drawings ready in the next day or so. Luppino is getting up to speed on MD3. Amazing! VIII) Camera/Collimator Barrels Via Alan Schier: February progress on Collimator and Long Camera preliminary design: The first-pass mechanical layout complete for collimator and long camera. This includes: --Cell, subcell, and barrel configurations. --Athermalizing spacer configurations. --Suspensions for movable cells. The layout indicates that there will be some tight fits where the back of the collimator meets the front of the camera. Estimates of the thermal behavior of the system are complete. The system was analyzed as three major component groups: the barrel, optics, and thermal compensator. The analysis takes into account internal conduction of the elements and heat transfer due to convection, radiation, and conduction. For athermalization to work properly, it may be necessary to insulate the optics barrels. Structural analysis is in progress. The analysis focuses on the barrel stiffnesses, induced stresses in the finger-stock and cemented optics mounts, and structural performance of the athermalizing mechanism.