Minutes of the Tracker
Technical Meeting
September 25, 2003
Action Items:
1) Tom - Call COI on shipping of Prepreg and coupon test plan to
Plyform
2) Tom - verify with Gunther that extra VME Processor boards can be
supplied in place of VME crates (Yes)
3) Luca - send delivery dates and quantities of VME Processor boards
SLAC
4) Luca - send to Tom data on Power Supply that they are using in
their EGSE System
5) Sandro - Ship 1.75" Carbon/Carbon bars to SLAC
Attendees: Luca Latronico in
Pisa, Sandro and Nanda in Milano (Plyform), Tom, BJ, Jeff, Dave, Bernie Graff
and Tom Vanator at SLAC.
Sandro reported that Plyform
is ready for the prepreg which Tom stated was to be shipped this week. Sandro
stated that Plyform also needs the test coupon and test procedure as soon as
the materials arrive. Tom will check on both and send email as to the status.
There are three coupons at Plyform that will be used for the compression tests
with results available early next week.
The pitch adaptor attach
method was discussed as well as the possibility of having this done at G&A.
The timing and logistics will present some issues, however this may be the best
method of getting TMCMs that are consistent and meet all the requirements
giving repeatable and reliable assemblies. To study this G&A will need 5 to
10 TMCMs and pitch adaptors to develop the tooling. It was also requested that
5 or 10 of the first 50 TMCMs, with pitch adaptors, be sent to G&A for a
fit check. These will be checked and then returned to SLAC/Teledyne in a very
short time. The purpose of this is to have G&A get a first look at the
pitch adaptors and bond area to see if these will be allow for automated wire
bonding or require continual operator assistance. Sandro voiced a concern that
on the TMCMs for the minitower there were about 8 channels on each board that
were not connected to the GTFE and they could not see any cracks in the pitch
adaptor to account for this. It is believed that there
is a broken wire bond, under
the encapsulation, from the pitch adaptor to the ASIC. SLAC will study this
possibility with Teledyne.
Luca reported that INFN was
prepared to supply the EGSE parts as specified an email. The Dawn VME Crate is
not available in Italy. Luca asked if they could get another type or supply
more VME Processor boards and have SLAC procure the Dawn VME Crates. I asked
Gunther and he said that is acceptable so now we need to work out how many
extra VME Processor boards will be needed to cover the cost of the VME Crates.
The power supply that is specified, B&K, is available in Italy but does not
work well with the 220V system there and Luca will send Tom the specifications
of the Power supply that they are using so that Tom can clear this with
Gunther. Luca will send delivery data on the VME Processor boards as soon as he
receives it from the local vendors.
The material for the tray
panel closeouts is at Plyform, the insert installation jig is complete, no
information on when the inserts will be available. Early next week Sandro and
Nanda will review and revise the documentation as necessary and send to SLAC to
close out the PRR action items. Sandro will get the material information and
procedures for the resin coating and forward them to SLAC.
Plyform has ordered the
Areoglaze Z307 for the sidewalls, no available date given.
The 1.74" Carbon/Carbon
bars will be shipped to SLAC 9/26 or 9/29.
Sandro reported that the
final bond layer thickness for the detectors to the bias sheet is 0.250mm. The
drawings show this as 0.150mm. SLAC and Hytec will look at this to see if there
will be an interference issue given the current tray spacing. After this review
the drawings will be updated accordingly.
Sandro discussed the corner
flexures and corner brackets. The fit of the corner flexure into the corner
bracket be a G6-H7 standard coupling fit. SLAC will look at this and set up the
drawing such that there is a good fit. The parts will be made to fit, in pairs,
marked and delivered such that the fit can be controlled and maintained through
the assembly sequence. The fit of the pins in the corner bracket was also
discussed. Sandro requested that the pin holes have a tolerance of +0.002 to
+0.008 mm.