Minutes of the Tracker Meeting
January 30, 2003
Action Items:
1. Tom: check on lead time for the polyfuses
2. Robert: make sure that the GSFC issues and
questions on the polyfuses get addressed
3. Robert: send the HV cap procurement spec
out for signatures, for it to be released in Cyberdocs
4. Nick: review the ASIC specifications
5. Robert: check with Dave on the status of
the flex cable spec
6. Nick: check with Omnetics about the
heritage of the nano-connector and what needs to be done for flight approval
7. Tom: send Teledyne adhesives information
to Nick
8. Tom: start the procurement process for all
SMT parts and the connectors
9. Tom & Robert: talk to Sandro about
getting the sidewall prepreg order in place
10. Nick: send to UCSC ESD and clean-room training
information
11. Tom: try again to fix the shipping hangup
between SLAC and Pisa.
Nick Virmani joined the meeting to discuss
procurements of MCM components.
Regarding the polyfuse, the GSFC comments were forwarded to Dave Nelson
10 days ago. Also included was a
fixture design for how to test the parts without soldering. Tom will check on lead time for these
devices and will start procurement process.
Hartmut has email from Raechem about what testing they are willing to
do. Robert will see that the GSFC comments
and questions get addressed. Tom will
be the point of contact for Nick on the polyfuse procurement.
HV capacitors: Robert will send out the
specification for signatures. Dave
Nelson has the quotation.
Nick will review the ASIC procurement
specifications sent by Robert. He has
already forwarded radiation test specs to Goddard for their comments.
Robert will check whether Dave has finished
reviewing the flex-cable spec. It was
agreed that we will order a preflight prototype to this spec, but the short
cables for the mini-tower electronics tests will be procured in Santa Clara,
due to time constraints. Nick said that
he will arrange for GSFC representatives to visit Parlex prior to CDR. He recommended that we do some testing of
existing Parlex flex cables pre-CDR.
Connectors: Omnetics in general is acceptable
to GSFC. However, this particular part
has never been qualified. Have the
parts been used anywhere else? Nick
will look into this asap. Tom suggested
checking whether the pin and socket have been used in other connectors in
earlier flights, and Nick agreed that this is what he will look into.
Nick said that other SMT parts are approved,
but he needs information on the vendors that we will use. He said also that we need to specify testing
on the PO. Nick will send to Tom and
Robert the specs today for these standard parts.
Tom will send email to Nick about the
adhesives and glop top that Teledyne is using for the MCM. He said that they are already on the Goddard
list, so Nick was sure that they should not be a problem. Tom is pushing Jeff Tice to get them signed
off. Nick says we can go ahead and
procure them in any case
Aluminum cores: due to limitations at
Plascore, the core thickness tolerance is now 0.002 inches. To accommodate this, we will decrease the
thickness specifications by 0.001 inches.
Tom said that this is okay with Sandro.
Erik reported that Hytec is updating the
model, including features discussed earlier this week during their visit to
SLAC. There are some additional
modifications to the M55 reinforcement of the bottom-tray closeout frame. They are also playing with corner flexure
design to resolve stress concentration issues.
Tom said that he got a quote from COI to buy
two towers of panels now and the rest later.
This costs about $20k more that way than ordering the entire EM plus flight
lot at once. ($190k vs $170k) The cost will be about $27k for this initial
order of enough for two towers. Tom
said that COI buys raw fibers and is a certified prepreg manufacturer. They would be willing to deliver the initial
order of prepreg for use while storing the rest for the later towers until
needed. It was emphasized that Italy
needs to get an order in immediately in order to have coupons for testing and
to have the pieces needed for the EM tower.
Erik said that he will send e-drawings of the
static test fixtures to Tom and Robert.
Robert said that BJ and Dave need to update
the MCM PWB drawings for the flight build, so that they can be sent to Teledyne
for review.
Robert reported that UCSC is working on
finishing up the EM MCMs. The last 4
are being tested and reworded at UCSC instead of Teledyne. When they are 100% working they will be sent
back to Teledyne (soon) for encapsulation.
One of them needs to go to Italy.
UCSC is also redoing all of the wafer-testing probe cards and upgrading
the clean room and probe station. Nick
will send information on ESD and clean-room training for UCSC use.
Tom is checking into why the shipping from
SLAC to Italy still isn't working. The
MCMs and the Nusil still haven't arrived there.