Call: 510-665-5437
Meeting ID: 4886
Agenda:
1. static test status
2. K13d panels
3. tray assembly for the EM
tower
4. EM tower vibration
planning
5. EM flex cables
6. Thermal vacuum test
planning
7. mini-tower status and
pitch-adapter issues; last 2 MCMs
8. A.O.B.
Action Items:
Actions to complete in
preparation for the vibration test: (Dates are my estimates of latest possible,
for July 28 vibe test; let me know if I forgot something)
-
Hytec
static test of the 1st bottom tray, with YS90 panels, to 125% of CLA
loads (July 18)
-
Hytec
ship 1st bottom tray back to Pisa (hand carry) (July 21)
-
Completion
of K13d sidewalls, static-test sidewalls, and coupons at Plyform; ship joint
coupons to Hytec (July 21)
-
Material
strength tests of K13d coupons at Plyform (July 23)
-
Hytec
pull the joint coupons (coupons with inserts) (July 23)
-
Hytec
static test of the 2nd bottom tray to static-equiv random vibe loads
and then to destruction, with K13d sidewalls (July 25)
-
Completion
of ladder and MCM mounting at G&A; wire bonding, encapsulation of a few
layers (July 21)
-
Pisa
completion of the tower assembly fixture (July 21)
-
Bari
et al. finalize the vibration test plan and review with GSFC (July 21)
-
SLAC
ship the vibration fixture and bottom plate and lifting fixture to Pisa (July
14)
-
SLAC
machine the cable-holding fixture parts for the vibe test and send to Italy
with Ronaldo(July 18)
-
SLAC
finish the flex cable assembly & debugging and send to Italy with Ronaldo
(July 18)
-
Pisa
test and survey the fixtures on the vibration table at Alenia (July 24)
-
Pisa
assemble the EM tower and install instrumentation (July 25)
-
Pisa
securing and torque striping of fasteners?
(We need a plan here!) (July 25)
-
SLAC
complete and ship the tower inner shipping container to Pisa, to be used in
transporting the tower to Alenia (July 24)
-
Steve asked if the side flexures
are bonded on the bottom tray. The
adhesive is only on the screws, whereas the plan had been to bond the entire
joint. Some adhesive could still be
added in the gap along the face sheet.
BJ needs to add this glue joint to the assembly drawing.
K13d panels: The material is being picked up today from
customs. Testing of the resin and
testing of lamination will be done first, to requalify the material. First thing next week Plyform will do the
lamination, maybe tomorrow. Sandro will
be there Monday to define the schedule in detail.
Pitch adapter problems. They have wire bonded 4 layers at G&A, 1
double-sided tray and the top/bottom trays.
Sandro tried and failed to repair the unbonded flex. 200 channels were lost on the left side (1
to 200). 10 channels are unbonded on
one side of double-sided tray as well, due to damage in the trimming process at
Teledyne. The finished PWBs were
slightly short, such that the Teledyne tool for flex attach tool ended up
putting the flex on at a slope, with a lot of glue under the SSD end. This caused bad trimming and bad planarity
for wire bonding.
There also appears to be a
dimensional problem with the pitch adapters, which are 0.2mm too long, from the
first strip to the last. BJ is getting
unused pitch adapters measured at SLAC to see if the error is manufactured into
them. If not, then it may be a CTE
problem at Teledyne, although the problem does not show up in older EM pieces,
which used the same layout and the same assembly tooling.
Tom is taking the last two
MCMs to Riccardo in Los Alamos. One
(106) is electrically perfect, while the other (109) has one dead front-end
chip, apparently from damage during encapsulation. Tom is also taking a NASA approved tape for sealing the tracker
corners.
G&A is continuing to
mount ladders onto trays. 9 trays have
ladders. 1 more will be done
tomorrow. They will start tomorrow to
glue electronics on. They plan to wire
bond all, but encapsulate only a few.
They will encapsulate more after the shake test and prior to the
thermal-vacuum test.
BJ is trying to get a
fixture made for holding the cables during the vibration test. BJ will send the
fixture drawing to Nanda and Steve for review.
Steve will send Nanda and
Robert the static test procedure.
Sandro said that a modal
survey of the bottom plates and fixtures need to be done the week before the
vibration test. He must have all the
fixtures by the 21st. They
can be sent with Tom, or with Ronaldo on the 18th.
They will have a meeting at
Alenia next week to go over the test plan.
The plan will have to be reviewed with GSFC by the 21st.
BJ needs to send the tower
lifting device to Pisa also.
Steve reported the that the
grid simulator is still missing from the static test setup. They are hoping for it by the end of the
week. Hytec will install the strain
gauges today and tomorrow. He estimates
2 to 3 days for the test. The tray
needs to be in Pisa by the 21st. Nanda
suggested the TWI courier service for hand carrying.
Nanda suggested that a
face-to-face thermal-vacuum test meeting take place in Pisa following the vibe
test.
Sandro reported that the 2nd
bottom tray is in transit by DHL, going to Los Alamos.