Minutes of the Tracker Meeting, May 6, 2003
Erik will send drawings for the walls of the static test fixture in a couple of days. They will have a height of 5 trays, so we could get 3 from a full-size panel. Erik needs 2 sets, to be safe.
Tom will discuss with Sandro whether Plyform can machine these panels and put in the inserts.
Hytec will also make drawings of the sidewall test coupons. They are adding additional tests with the new M4 inserts.
Minutes of the Tracker Meeting, May 8, 2003
Tom asked if we need to put
a groove on the closeout drawings for the grounding wire. No, said Sandro, the groove is done at the
tray level.
Also, another grounding
scheme is being worked on. The idea is
to put in wires from the honeycomb to all 4 closeout walls from the
inside. No external modifications would
be needed.
Regarding starting up flight
tray production, Sandro said that machining of inserts and material
procurements will be starting soon.
Before machining closeout
pieces we need the following issues closed:
-
modification
of venting holes in the structural walls to make a visible asymmetry in the
tray. Sandro has sent BJ instructions
for this.
-
testing
and acceptance of the final core grounding scheme.
-
testing
and acceptance of the new MCM mounting scheme.
There was a discussion of
ideas for tooling to clamp the MCM in place while gluing. BJ said that the tolerance of the MCM
mounting holes is a true position of 0.05 mm. Sandro proposed to use two of these holes as reference for
mounting the MCMs. In that case he
would need larger holes in the carbon-carbon to avoid interference, and he
would remove the reference knobs on the thermal boss. Up to now the mounting holes in the board have not been the
reference. Only the bottom edge is a
precision reference for the vertical placement. The horizontal reference was assumed to be slightly adjustable,
in order to align the MCM traces with those on the bias circuit. Sandro will relook at this approach and
discuss it at SLAC next week. The final
scheme will be tested with EM trays.
Robert stressed that this all needs to be settled, tested, and reviewed
before machining closeouts.
Luca Baldini summarized the
mini-tower status. It is working and
taking cosmic-ray events with no crashes and minimal errors. One layer has lots of excess trigger
requests, which needs study. Eduardo
said that they plan to study the system trigger timing, also. Recently they found an event decoding bug in
offline and are working on fixing it.
Then the large data sets can be analyzed.
Tom reported that two
closeout pieces for the bottom tray are coming tomorrow and will be
measured. The rest will arrive mid next
week. He and BJ will fab the drill tool
soon. The drawing is 95% done. They will send it to Erik for review.
Sandro said that he needs to
contact Plyform to understand their production plans before settling the issue
of whether Plyform can machine the sidewalls for the static test fixture.