Erik
said that the inserts for the end screws on the MCM interfere with the closeout
walls by ½ mm. Either flats must be cut
on the inserts or else the MCM layout must be modified. Gwelen will look into modifying the layout
to shift the hold by ¾ mm.
Tom
(in Pisa) reported that they are discussing assembly issues. He is also going over environmental testing
with Bari. He received a quote for the
Cristek connectors: $39.75 for the socket and $39.25 for the plug. This is for molded parts. The lead time is 14 weeks.
Sandro
reported that a ladder was made with HPK detectors. The maximum error was 17 microns end to end and 8 microns wafer
to wafer, with less than 20 microns vertical step wafer to wafer. Preliminary drawings are ready for the tray
service box and will be put on the web.
We need at least 5 cm length for the connector savers.
Sandro
said that they have made an FEM of the Agile tray and found good agreement with
measurements. They are now running the
GLAST tray. He said that CERN will
measurement modulus of the silicone adhesive.
He said that he put on the web some drawings of his ideas for tray
assembly.
Erik
reported that Steve has written up his study of tolerance stackup in the
tower. Erik will review it and then
distribute it. The face sheets have
been cut. Pull tests will be run by the
vendor this week before shipping. The
tooling for panel assembly is being machined.
A test closeout frame (with some detailed features left out) is due
Monday from the machine shop. The
closeout drawings are being finalized, with an RFQ to be done next week. Tests were done on inserts to test the
aluminum strength. The results look
favorable for the use of aluminum: the carbon-fiber will fail before the
aluminum would.
Robert
reported that the deadline for first drafts of PDR documents is May 9, for a
dry run, with final drafts due May 16.
SLAC
is still working on setting up the glue dispenser, with some problems. The syringes are on order.
John
said that there is some delay of the EDM of the tungsten wafers, because the
staff is out for one week.
Gwelen
said that the MCM layout is nearly complete and that the 1.6 mm screws
worked out okay. The pitch-adapter
layout is also nearly complete, but the work on assembly tooling is a little
behind. There are some issues with the
tooling for precision adhesive application.
Glass beads are going to be tried out for spacing, to ensure uniform
adhesive thickness.
There
will be a meeting with Q-Flex on Friday about cable fabrication. BJ said that Nanonics could make a
vertical-mount plug; he will send the drawing to UCSC. However, the preference is to make the cable
with no bend at the top. Tom will
contact Martin about stay-clear issues in that region.
Erik
said that he would like to have the closeout drawings checked by BJ and Gwelen
before the RFQ. He will have them on
the web by Monday.
Action
Items:
1.
Gwelen:
get the MCM layout modified to shift the outermost screw holes inward by ¾ mm.
2.
Tom:
talk to Martin about the stay-clear at the top of the tower and whether some
more space could be had for the readout cable.