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VIRUS meeting at TAMU 2010.05.18-19 Jennifer: 8:15 am VIRUS meeting at TAMU 2010.05.18-19 Attendees: GH, HL, BV, JLM, DD, TP, RA Need to think about assembly procedure: Need to think about how to save hours of assembly time on each assembly Need to think about how to make assembly a one-person job How many prototypes to build? One, then four, then more Should put together 2 pairs, send one to AIP Look at collimator tests in lab Collimator mockup FEA tests: Deflection is within 2x FEA results What orientation should we assemble collimator in? Do we need dummy weight for fiber head? Want to put mockup on camera v-blocks to simulate camera mounting Can we make new casting (round 2 of 3)? We need to review several issues before recasting: - mounting blocks - collimator mirror installation - other features? - epoxy joints? Collimator model: We have a new collimator assembly procedure We have a rough camera assembly procedure Things to change on collimator castings: Add in feature for M6 screw adjustments+springs for collimator mirror, leave possibility of finer pitch screw Baffle between two channels Make rods out of narrower (1/2 inch) stock to increase clearance on collimator mirror Excess holes for puck Dial indicators on collimator mirror adjustment--no Where to place corner blocks? What do top plate and side plates look like?--Travis will look at FEA of different options Is it okay that bottom plate is held by screws only? Should it be epoxied? We think it will be okay for now, but will test it Bolted joints on bottom plate are cause for worry--we need to think about whether this is an issue, and how to fix it if it is What happens if we remove the bottom plate? Mechanically pinning bottom plate is difficult, probably need to epoxy it--but then you can't remove optics without difficulty Bottom plate will be glued to corner block in three locations, corner blocks are attached to head and base plates, that can be removed So castings need to have three corner blocks for bottom plate Other issues: Collimator finish - Cost of anodization? - Should we baffle? Anodize? Paint? - Need to test scattered light in different versions of prototype - Probably need baffle between the two Collimator handling cart - make sure it has all the right features for alignment tests and also allows enough room to rotate for assembly and attach weights to simulate loads Assembly procedure - Jen will start making detailed assembly procedure Head plate deformation - We need to make sure head plate doesn't deform during alignment Optics procurement discussion with Marc: Group optics RFQ as cylinder, flat, two aspheres, two spherical mirrors We want to buy cylinders from HJOL, get a quote for coated lenses in quantity 100/200 We want to buy 6 flats (3 from UT, 3 from TAMU) from PG&O to evaluate quality Need to get out large quantity RFQ for aspheres and spheres Want set of optics in time for first CCD delivery We should order 6 each of the aspheres and spheres--that gives one VIRUS to UT, TAMU, AIP That procurement should be all from one institution Full RFQ: - Ask for 100 sets with option for second 100 with a date for exercising second set? - Specify what metrology we want - Need to update drawings--get all specs onto drawings - Need to look at ULE Small RFQ: - Should we buy 3+3 FFs from Edmund? - Want 6 complete sets by September - Mirrors will be aluminum, lenses will be AR coated (should we relax spec?) Action items (TAMU) - Contact PG&O for 3 flats, coated - Contact Edmund for 3 FFs, AR coated - Jen will summarize material recommendations from vendors Action items (UT) - Buy cylinders - Redo optics drawings to reflect what we've learned from vendor visits - Contact PG&O for 3 flats, coated - Contact Edmund for 3 FFs, AR coated - Send package for 6 spheres to JML, Jenoptik, etc. through purchasing - Send package for 6 aspheres (corrector plate + FF) to JML, Jenoptik, etc. through purchasing - Hanshin will look into whether any optics optimization will make a big enough difference to warrant changing design - Need to model deformation of coating per Corning's comments - Brian need to decide on camera mirror shape - Look at ULE - Marc will transfer more funds to TAMU, esp for travel (personnel after one year) Lab cooling systems One for UT and TAMU Bayonets--need to finalize design of tip Need a 20 liter single bayonet system by August--TAMU will look into it, Brian suggests MKS for flex line, Universal Cryogenic in Tucson for dewar Grating RFI What parts can we start building now? Flex disks--need 600 CMA connection brackets--wait until mirror design is finalized Prototype rest of camera hexapod--need 3 pairs Getter block, copper wire clamps--need 3 pairs MooSci
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