Minutes of the Tracker Meeting
June 10, 2004
EM bottom tray status: today Plyform did the assembly of closeouts and flexures to the sandwich. Tomorrow the tray will be completed with just the Kapton and grounding wire missing. It will go back to Pisa tomorrow for dimension checking. A post cure will be done Friday evening at 50C. Monday it will be ready for the vibe test.
Dave reported that the nylocks on the studs won't be completed until Tuesday. Tomorrow they will be picked up from the vendor that coated them with dycronite.
The vibe fixture is in the SLAC machine shop and is progressing well, on schedule to complete COB tomorrow. Saturday it will get a CMM inspection. The tentative plan is to hand carry it together with the studs (in which case they arrive in Pisa on Thursday). Also the cones and nuts will go. The only tool missing is the protractor and templates for setting cone angles.
TRR for the test should be next Friday.
Sandro said there is no manpower to do alignment tests during the vibe test. Afterwards we could do the exercise with the EM tower. The EM tower, having a flight bottom tray, seems more appropriate than the reworked old prototype tower from SLAC. Sandro said that they could start this effort on June 30th at the earliest. Arthur reported that he will test the tools next week and then make a second set.
Sandro reported problems with the tooling to attach MCMs to trays. The tooling assumed more than the 1.3mm stay clear called out on the MCM drawing and will have to be modified.
He also reported that the pitch-adapter planarity of the 11 flight MCMs is good. The pitch adapter still shows shrinkage of up to about 200 microns in the long direction. Robert said that the pitch adapters were screened to eliminate any more than 100 microns short, but then they tended to shrink some more by the time they were bonded to the PWB. Teledyne ran a test with doing a room-temperature cure of the pitch-adapter/PWB assembly, but that did not help.
Sandro will go tomorrow to G&A to check the status and discuss schedule recovery.
Martin reported that the 2nd round of check prints is going out on 2 of 3 mid trays. He will check this 2nd round today. Then he will go directly to a release copy, which should be out tomorrow for 2 of 3 mid trays (regular and heavy).
Sandro said that there is a new version of the procedure document on his web page with names of the internal procedures included. He will ask G&A for the drawing numbers tomorrow. Robert will send it out as is for review today.
Tower-A Bottom Tray:
Martin reported that the Top/bottom tray assembly drawings just need signatures from Jack Goodman and John Ku and then will be released (was done by COB).
There was a long discussion of Martin's issues with the procedure document. The main issue was with the procedures for dimensional verification and the associated figures in the document. In the end it was resolved that INFN will update the document following the experience tomorrow with measuring the EM bottom tray. They will fix or eliminate the offending figures. The dimensional verification will include all critical dimensions and will be referenced to the datums as called out in the released drawing. We will connect up by telecon Monday morning PDT to complete the review/sign-off. INFN reps will be at Plyform on Monday to go over the EM bottom tray results, and the final Plyform inspection procedure will follow from that.
Top tray: Sandro does not know the status of the closeout machining by will find out tomorrow.
Jeff said that he is negotiating with aluminum foil vendor. He estimates 2 to 3 weeks from now to have the foil in INFN.
Sandro said he could have a European food-grade (i.e. no oil) foil by next Wednesday. It is a softer material, however. Sandro will send the material specs by email to Ben Rodini, since Ben provided the spec presently on the drawings.
Tom Venator said that he has the M2.5 screws and will be flying into Rome on Sunday.
There was a long discussion on heat straps. INFN insists on gluing the straps to the bottom tray, to ensure that they do not move during vibration. That will require some analysis and test, however, to ensure that whatever adhesive is used will work. Redesign of the strap itself may also be needed.