Minutes of the Tracker
Meeting
July 29, 2004
0) Thermal-Vacuum test
preparation
Nicola reported that the
inner shield is assembled and is being proof tested. The inner surface will be painted black at Plyform. All will be ready at the beginning of
September. He said that the TQCM from
Alenia was 20,000 euros for 10 days.
1) Jeff:
- Plyform EM sidewall coupons with inserts. Is there still any point in pulling
them? All agreed that we should not
bother with pulling them since the design of the sidewalls has changed
significantly since then.
- BR127 primer shipment
2) Sidewall status
Nanda said that so far there
is no change to the sidewall spec document.
He will try to close the issue this week. Plyform has done a test layup.
The result was 1.55 to 1.60 mm thick with the aluminum and very
flat. They have also done the
lamination for the coupon tests and will test the coupons next week.
3) Tray panel fabrication
status
Two trays will arrive
tomorrow from Plyform. Delivery of all
trays is expected next Wednesday.
Friday they will be shake tested.
Over the weekend & Monday the T/V of the panels will be done. Sandro said that they will do T/V testing of
complete trays at G&A for those cases with bubbles or without sandblasting
of the tungsten.
The Tower-A schedule will be
updated Friday based on current status.
- Test temperature requirements:
* can we specify a temperature at which we know our
design works?
Sandro said that at room
temperature there is no problem while at 55C they have some problems. Intermediate temperatures have not been
investigated in detail. For the upcoming
tray T/V test they will first try a couple of lower temperatures to investigate
this issue.
* what is the maximum tower-tray operational temperature?
4) G&A tray assembly
status; report on encapsulation and T/V tests of the first trays
The two trays were subjected
to the T/V test at 50C for >12 hours at 200mbar pressure. There was no change following the test in
function or leakage current. In the
next day or so they will do the thermal cycles cold/hot.
Sandro said that there were 3
missing channels from a problem with encapsulation of the first MCM, but they solved
the problem after that first layer and the remaining 3 had no problem.
There is one more tray at
G&A ready to go and 2 more will be there tomorrow. Another 2 more will arrive at G&A
Tuesday and the rest at the end of next week.
5) Dave: status of SLAC
procurements:
- I/F hardware
The cones are in hand; hex
bushings are out for dycronite; studs are in hand; they completed the
inspection of the hex nuts
Arthur is working on the
shims: we will use nickel plating; it will be done internally at SLAC
- Sidewall fasteners
The M2.5 * 100 degree are
ready to send
The M4 * 6mm screws are still
to arrive
- Lifting fixture
The first one is ready to
ship; INFN needs one more plus a spare (total of 3 in Italy)
- Inner container
It is assembled; proof loading
will be done mid next week.
The cable holding plate is
in hand.
- Outer container
A draft drawing is ready today
for checking by Martin and will be send out for review soon, maybe tomorrow.
- Bending tools
Arthur: early next week he
will have the 1st article.
He will make a mockup of the
top bend to do tests of the installation; it will be in the shop early next
week
- Top corner brackets
These are in fab and will be
ready in another 1.5 weeks
- Nests
These are at SLAC and need
CMM; Jeff needs the specs on the tooling balls.
- First tower baseplate: it will be in early next week from
Humboldt for use on Tower A
- Some extra heat straps are ready to send to Pisa.
- 2mm pins are ready to ship (for the bottom tray closeout)
- SLAC ordered the environmental recorder and digital torque
meter
- The heat strap tie-down strap drawing was released; the strap
in Italy needs to be modified accordingly.
6) Robert: EGSE status
- TEM/PS for thermal/vacuum testing
It is ready from the
electronics group and should be tested today by Hiro.
- EGSE cables
Jerry is working on getting
a revised design of the C0 cables shortened to fit on a standard panel and will
have them made on a rigid board. Nanda
said that the existing jumpers are long enough to connect such a board into the
TEM. INFN will check on the quantity of
jumpers.
7) Tower assembly
preparations:
- Dave: SLAC support plans & travel
Ronaldo questioned the need
for so much SLAC support for the alignment procedure. This will be discussed in the Friday-morning management meeting.
- Assembly procedure
Emilio is working on it;
tomorrow or Monday the next update will be ready for review.
Nicola Saggini is working on
the procedure for transportation and handling.
Arthur asked if there are
more details on cable installation. He
will send email next week with some suggestions.
- Marting said that there will be an updated assembly drawing
draft today.
- Alignment procedure
A new draft came out
yesterday---it should be nearly ready for release.
- Date for PRR
Pisa suggested August 25.
- Electrical test procedure
The 191 document is still in
work by Luca.
- Turn-over fixture status, including proof tests and
procedures
Emilio reported that the machine
shop is working on it; it will be ready early next week. He is working on plans for proof tests and
will send a draft out tomorrow; Martin said that we need the analysis report
for review by John Ku. Emilio said that
the report will include hand calculations.
Martin agree that that was probably sufficient.
- Date for pre-ship review: not discussed
There was a discussion on
how to obtain a measured cg for the tower.
Due to the expense of making a new fixture for a direct measurement, the
preference was to weight all of the tower parts, including trays, and calculate
the cg. Martin said that he can put the
tray weights into his spread sheet to calculate the cg.
8) MCM status
- July 22 status: 194 received at SLAC, 109 reworked
- 36 out of burn-in yesterday and under test; 27 starting
burn-in
- New pitch adapter status: pitch adapters are at SLAC and
Teledyne has the contract to do the qualification work
10) A.O.B.