IMACS progress report no. 22 B. Bigelow 26 January 2000 1) Project Status Currently scheduled tasks: Status: a) Filter Server drafting (Poteete) done (early) b) Long Camera mech. design (Bond) late start c) Shutter Fab. (Kowal/Surnock) late start d) CF Guider mech. design (Hare) on schedule e) Mask Server Fab. (Storts) late start f) Collimator mech. design (Bigelow) late start g) Dewar Fab. (Luppino) on schedule h) Science Array Controller Fab (Burley) late start i) Motion Controller Fab (Carr/Berger) on schedule Details: b) Late finish of LC prelim design is delaying design start. c) Late availability of machinist is delaying start. d) Mask server fab delayed by early start of FSS fab. f) Late finish of Coll. prelim design is delaying design start. h) Controller design is running 2+ months late 2) Optics (Sutin) 2.1) The specifications for the three short camera CaF2 blanks were given to Optivac. We are still waiting for the final Long Camera blank, which is not required for coating, and so does not currently have an impact on the schedule. 2.2) The field lens is finished, and has been signed off. I have asked Brashears if they would hold it until it can be shipped directly to the coaters, but I have not heard back on this point yet. 2.3) The more detailed sensitivity analysis for the camera barrels is going to be finished this month. 2.4) No word yet from Coherent on coatings. 2.5) Raytheon has apparently made reasonable quotes to CfA for making aspheres. UofA has also expressed interest in making aspheres for IMACS. If an opportunity for fabricating the Short Camera aspheres appears, we will probably take it. 2.6) TORC has finished C02, one side of C03, and is almost finished with C04 and C05. As soon as C04 and C05 is finished, the final pickup surface on C03 will be determined. Optics TODO List: 1) Baffle analysis 2) TV Camera designs 3) Filters 4) Asphere fabrication 3) Electronics (Carr) Filter Server: 3.1 Two of the four cables needed for the FS test have be constructed. We are waiting for connectors to arrive before the rest of the cables can be completed. 3.2 The motion control chassis assembly needed for the test has been started. The back panels layout is complete and-has been given to the shop for fab. Internal ribbon cables have been constructed. Further progress with the MC awaits final selection of terminal blocks. Samples are due 1/26. 3.3 The MC computer parts are all in, except for the computer chassis. The chassis was due 1/13, and I will check on the delay today. 3.4 I have asked Greg Bredthauer to simplify the controller software at the request of Alan and Christoph. Greg thinks the work can be completed shortly, but because our network is currently down, I have not been able to get a progress report from him. Shutter: 3.5 Tyson provided documentation for the shutter server motors and drivers. After review, it appears that a separate chassis and power supplies will be needed for the shutter. 3.6 I was concerned that the 20m cable length to the shutter motor/encoder might be a problem. However, the local rep. for the servos told me that the cable length will not be a problem. 4) Software No work scheduled for January. 5) Mechanics Tyson: Camera Shutters: 5.1 The camera shutter design is complete. Assembly drawings are needed to complete the drawing package. 5.2 Motion control and motor electronics issues have been discussed with electronics engineering. 5.3 Part ordering is now in progress. No excessive lead times are currently expected. IMACS File Server: 5.4 The IMACS File Server has been set up and is ready for use. Any IMACS related documents may be stored on the server. The current plan is to back up the server on a four week cycle. CF Guide Camera design: 5.5 Preliminary work on the center field guide camera began this month. A significant redesign of the center field guide camera mechanical layout was proposed at a design meeting and is being further examined. Tim: 1. Filter Server System: - All purchase parts have now arrived. - The part drawings for the server have arrived from Mary (not the assemblies). I am currently "red-lining" them and hope to have a set to give to Vince by Monday. - The shop is finishing the work on the prototype stage this week and will be ready to begin work on the remainder of the server mechanism on Monday. - The prototype stage that was done in Victoria has arrived and looks good. 2. Lens Mounting. - Presented work on the multiplet mounting scheme on the 13th (Jan). - it was determined that more analysis is to be done (FEA model). As well a prototype of a doublet will be constructed. 3. Instrument Assembly Area. - A list containing approx. $1000 worth of assembly tools was submitted to Jeanette. Bruce: 1. Collimator prelim design continued in Jan. Previous finite element models were modified to examine the effects of a thermal gradient across the diameter of a flexure cell. Peak stresses of about 200 PSI were found for a 5 C gradient, which appears acceptable, especially since such a gradient would be difficult to establish. 2. RFQ's were sent out in Jan to gauge the cost of fabricating the flexure cells. Electronic Discharge Machining (EDM) is the preferred fab. process for the cells, and the first three quotes indicate that EDM will be competitive in terms of cost. 3. RFQ's were sent out for the Slit mask frames. The frames are about 26" in diameter, making outside fabrication necessary. The remainder of the SMS is expected to be fabricated at OCIW, unless overloading the in the shop requires outside fab. 4. RFQ's were sent out for hydroforming of the final design of the slit masks. The final material thickness, in steel or aluminum, is expected to be less than 0.010". 5. Luppino reported in January that the flexure/focus control stages in the dewar would be ready for testing in February. I have ordered a Heidenhain electronic length gauge system, which I expect to take to Hawaii in Feb. to carry out flexure tests on the dewar motion stages. Gerry Luppino: No report due to internet connection loss. 6) Detector Systems (Thompson/Burley) Guider cameras -------------- 6.1 - Robert has almost finished the machining of the housings. There is a bit of clean-up before the parts can be pinned together and sent for dip-brazing. 6.2 - we improved the power supply filtering (replacement filter inductor is on order). 6.3 - the next thing to do is to measure the low-speed read noise and to implement MPP mode imaging. Array cameras ------------- 6.4 - GB is still plugging away at the dsp board layout, and merging in some design changes. 6.5 - extra power supply filtering needs to be merged into the power board layout. 6.6 - we expect the dsp, power, signal processing and clock driver boards to be sent for fabrication in Feb. 7) Meeting notes: 7.1 Reports were presented from each area, as shown above. 7.2 Next meeting is on 2/23/00, 10:15 AM, new conference room 7.3 There was a discussion regarding data analysis software, and the data pipeline following readout of the science array. There was agreement that other sites have already done a lot of work in this area, and that it would be worth investigating existing software prior to starting our own efforts. Alan said he would start diverting more of his time to data analysis requirements this spring.