Minute of the Tracker
Meeting
January 8, 2004
Following the Agenda:
- date for completion of Plyform coupon tests
Expect to get a date by 9
Jan
- plan/date for resolution of action items for mid tray
production
Will discuss next week
-
Jim
Martin: status of Tracker/Grid interface design
See minutes of the Tuesday
meeting already sent out. A full set of
drawings for the concept agreed on at the meeting is due by COB Tuesday. Martin has sent an email (posted on the
Tracker web page http://www-glast.slac.stanford.edu/Tracker-Hardware/ART/vibe/vibe.html)
proposing a scheme for shimming the interface, necessary because of limitations
in accuracy that can be achieved in the Grid cutout. Roughly speaking, they will dimension Grid cutout 0+ and the
bottom tray 0-, then shim to make up the difference.
Discussed concepts for
machining flexures: Tom said that the drill tool is at SLAC. Only the 4 corners need to be drilled after
tray assembly. Side flexures will be
manufactured with cones already drilled.
Discussed design forwarded
by Sandro
ACTION: Borden (and BJ and Reggie) will put together
some sketches on how the tooling is supposed to work by ____? and then discuss
them with Sandro.
ACTION: Sandro et al will prepare more complete
drawings of their concept; we'll meet with Nordby, Bloom, Ku other experts to
make an initial review of this design concept at 8 am PST June 9
-
Tom
Venator: proposal for completion of environmental testing of the EM
The suggestion is to complete the T/V test first and then finish the vibration test. Perhaps the bottom trays can be swapped before the T/V test, giving a lot of time to rework the tray for the vibe test. The vibe test might be dropped altogether if demanded the flight build schedule.
INFN: removed the EM sidewalls 1 by 1 and
inspected. No damage found on sidewalls
and bottom tray so far, although holes in the thermal straps may have been
abraded, since a sliver of copper was found after the vibe test. They repeated the ESPI test, which gives an
f0 of 130 Hz in both directions.
- The primary difficulty in
running the vibe test after T-V is that the cables likely to be damaged
(stripped threads in connector attachment).
Robert said that the cables are not important for the vibration anyway,
since they do not represent the flight design.
- It will probably be at
least mid-February before the T-V could be carried out
INFN: still want to discuss their December design
concept for the Tracker-Grid interface as an alternative
ACTION: Jack/Nanda/Sandro/Nicola to revisit the T-V
schedule, starting with discussions with Alenia
-
Goals
and preparations for next week's meeting
Begin with overview
presentations. Then proceed to a
working meeting, which needs to focus on management issues.
INFN: Industrial partners will attend, as well as
representatives from each INFN institute involved with hardware fabrication and
test
ACTION: JFM to send a list of U.S. attendees to
Ronaldo
-
Status
of bias circuits, MCMs
Bias circuits: 39 were shipped to Pisa.
ACTION: Jeff Tice will send the pro-forma invoice to Sandro
MCMs: the first 4 received
were thermal cycled and burned in over the holidays. Presently 10 more have been thermal cycled and are now in
burn-in. They should be ready to send
to INFN by approx 16 January