Minutes of the November 13,
2003 Tracker Meeting
Agenda:
- Review old action items
- Status of vibe test preparations
- Status of T/V test preparations; schedule of TRR
- Status of mid tray assembly preparations
- Status of bottom tray assembly preparations; schedule
- Status of MCM preproduction and GTRC V7
- A.O.B.
New Action Items:
Old Outstanding Action Items
(Sandro was not present so some of these did not get addressed in this
meeting):
Erik reported that he
received the static-test sidewall panels Monday. Strain gauges are now bonded to them. Starting this morning they are setting up for the first axis
(z). They will start pulling probably
Friday morning. Tom needs to send torx+
M4 fasteners to Erik. Meanwhile Hytec
has to use the offset cruciform heads, which are a pain to get back out. Erik needs the coupon data from COI. Tom will find out after the meeting.
Tom sent T/V test curves to
Nicola yesterday from Jeff Wang. Later
today he should get curves for time to plateau for power testing. The first step will take several hours, the
rest much quicker. The plan now is to do
6 total thermal cycles, including the power thermal balance test. Jeff predicts that the center of the top
trays will take 10 hours to go from cold to hot or hot to cold. There was a discussion about definition of
reaching one end or the other. The
proposal is to eliminate and long soak at the extremes, and just hit within a
few degrees of the maximum range at all parts of the tower and then turn around. With this Tom thinks we can do 5 cycles in
about 4 days, plus 2 days for thermal balance.
Nanda said that he needs
information to correlate this plan to particular thermocouples to inform
Alenia. That is, the plan needs to
state for specific thermocouples what they must read to define having reached a
temperature extreme. Tom is still
waiting for predictions on stabilization at different power levels during the
thermal balance test.
Sandro sent out initial
drawings of the thermal blanket and support frame.
Nanda said that he will
write out a schedule and plan for getting from the vibration test to the T/V
test.
The draft plan and procedure
for the T/V test are on the Bari web page for review. Tom said that he will get a better copy of the curves to put into
the plan, into the Word document.
There was a discussion on
what thermocouples and wire to use.
There may be some already at SLAC that could be used. This did not reach resolution and needs to
be taken up offline between Jack, Nicola, and Tom. There is a total of 54 thermocouples.
Nanda reported on the EM
tower status. The sidewalls came in last
night. The cable attach fixtures is
being modified to fit better and align to the cables. Then they will start changing the sidewalls. This should be finished by mid day
tomorrow. There are some missing screws
for the sidewalls of the inner shipping container. Tom says that these screws were left at G&A. The first of these units has American screws
but the design has since been changed to metric. The plan is to take the EM tower to Alenia on Monday.
Plyform has cut the sidewall
coupons. They cannot get access to the
mini-sidewall drawings. Erik can send
the step files. Nanda will find out the
status of coupon tests and send to us. They
will do the tests in the order compression, shear, then tension.
Mid tray assembly
preparations: The web page for the PRR
has been updated with an action item list.
Many of the items require looking directly at Plyform documentation. Nanda said that it is difficult for him to
be at Plyform in the next weeks. However
he may be able to meet up with Darren or Jerry for half a day at Plyform. One of the actions is about mass
requirements on drawings. What is
really required there? A not to exceed
value? A minimum value? Dave Rich will clarify this with Darren.
Erik said that titanium part
machining took 8 to 10 weeks last time, so this time is starting to get
critical. We need all to respond on the
release of the parts drawings. Separate
assembly drawings are in progress. The
flexures will be assembled into the corner brackets before shipping to Italy.
MCM preproduction: The first lot of 6 is progressing with
component assembly. Results can be seen
in the Tracker presentation from last Wednesday’s management meeting. The second batch of 6 is getting bonded and
will ship to SLAC Friday. SLAC will CMM
inspect them Monday and ship them back to Teledyne. There is a QA survey
tomorrow at Teledyne.
Flex-circuit cables: Hartmut
reported that one of the main issues was to get a required length from
mechanical systems. The IDD will be
signed off at the end of the month; then we can have the PRR. We do have an agreed upon length, so the first
drawings are being finalized. The schedule
depends on the workloads of BJ and Thien.
We will make mini-tower cables as soon as the drawings are ready, and we
will use them to check fit on the mini-tower.
Jerry is talking with Parlex about production. The plan has been changing.
Now we will do the bending cold just before installation, because the
conclusion is that even a hot bend done initially will relax away and be
pointless added cost. BJ has to modify
his tool for bending cactus arms for the new 8mm radius. It can be used with connectors
installed. Jim will look into the
questions of manpower availability for flex-circuit cable design.