Minutes of the Tracker Meeting
June 13, 2001
Robert reported on the PDR dry run of the previous day. Tom said that he will send his presentations to Sandro for review. Robert will draw up a schedule for the presentations. They will take place at the Training Center at SLAC. We need an extra backup projector, so that plastic slides won’t be necessary.
See http://scipp.ucsc.edu/~johnson/glast/TKR_PDR/TKR_PDR_materials.html for the agenda, presentations, and all other PDR material.
Tom asked when Italy will have work-force numbers. He would like them in early July. They are need at least for the period from October to end of program. Such information for FY2001 is not so essential.
Hartmut and Tom reported on procurement of detectors at SLAC. Procurement people are ready to call HPK. It will be sole source. About $480,000 is available. Delivery will be in September. Tom would like to get the Italian order in, as well. Hartmut reminded us that we want to get 2000 pieces this year. Japan will put in order via KEK. Hartmut would like to understand the time scale of procurement from Italy. How long will it take to award a contract? We need to tell HPK on the November time scale that we want more produced after the first 2000. Ronaldo said that he can make a commitment in November but not place an order. He will have budget approval in September and can place the order in early 2002.
Hartmut talked about SSD shipping. He wants a document with everything written down clearly.
Ohsugi put results on their website of dicing at HPK. Now there is a 2 micron maximum rotation. HPK does not want to measure the dicing accuracy but just spot check. Sandro said that Pisa will measure them.
Hartmut will send the address of the Hiroshima website with data to Luca and Sandro. They should look at it to see if the format is okay for them.
Sandro reported that they glued wafers to two trays, one side only (tungsten side). One was done with Epotek epoxy and one with Nusil silicone adhesive. The first one had alignment problems, but that was corrected in the jig and the 2nd is much better. They are ready to test in the thermal chamber. They will instrument with strain gauges. They already did tests with strain gauges on known materials (quartz and aluminum and free) and got the expected results.
Sandro said that there still is a problem to have tungsten of 100um with good tolerance (better than 25%). Robert said that we should plan to weigh foils and bin them by weight to keep each tray uniform. We should put in the database the mass of converter on each tray. Tom suggested that we also weight tray parts (e.g. closeout sides) to see if they are in expected range, and we should weigh the entire bare tray and record that in the database.
Erik reported that core has been shipped. They should have it tomorrow. Some will go direct to PCI. He will send some to Sandro, according to our agreement. Hytec ordered graphite tooling for tray panel assembly, for a couple weeks delivery. The PO is ready for sidewalls, but waiting to get numbers for aluminum foil. Hytec is working on straightening out the drawing package. They will bring a B-size package to the PDR. Erik needs to talk to Allcomp to find out where the material is for the closeout walls. GMSI is ready for them. Inserts and fasteners are on order.
Robert asked if Pisa has checked the closeout drawings, to be sure it is going to work with their tower assembly procedure. Sandro said that he is more interesting in checking the sidewalls drawings. However, the plan is to try the initial assembly with Al sidewalls. We will update the drawings and machine carbon-fiber sidewalls only after a decision has been made on the assembly procedure.
Sandro will send corrected information to Tom on adhesives used by Plyform for converters and bias circuits. Sandro asked if we should use NASA approved glues according to manufacturer’s specs, or are there special NASA requirements. Tom said that the manufacturer specs are what should be used.
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