Minutes of feedthrough meeting 28 August, 2000

Present Mlenc, Mlef, GV, AD, TH, MGF, RL, PB

Milestones:

38 LV Vacuum cables 375mm lg received today.

173 of the regular vacuum cables have been tested (for a total of 300).
Paul Pof will now analyse the results before acceptance.

The cold test was canceled when it was discovered that the bellows vacuum
connections were made with solid rubber gaskets. This also explains why
the pincarriers required so much power to stop condensation on the pins. A
new cold test will be done this week.

Michel and Terry traveled to HCC in LA. They met with Tom Muller from BNL,
then Michel and Tom carried on to HCC. They had a tour of the machining
plant, followed by a meeting with several HCC and Glass Seal employees.
The meeting included an exhaustive discussion of all of the machining
processes that go into a pincarrier. HCC feels that the only change made
to the pincarriers since the prototypes is the low inclusion steel. They
are making ten pincarriers out of regular 304L steel for a control study.
A shipment of vacuum steel from CERN will be delivered to HCC for
additional pincarriers. HCC appears to be doing their best to solve this
leak problem with the pincarriers.

Mark has received some electrical components for the heaters. He will
check on the status of the machined heater plates. We still require
information on the type of wire permitted for the heater wiring.

For our choice of resistors:

 50 ohm resistors 3 amp P/S 	 75 W	  (   3A x 25V  )
 50 ohm	   	  6 amp P/S 	276 W	  (5.76A x 48V  )
 75 ohm	   	  3 amp P/S	112 W	  (   3A x 37.5V)
 75 ohm	   	  6 amp P/S	184 W	  (3.84A x 48V  )
100 ohm	   	  3 amp P/S	138 W     (2.88A x 48V  )

We will continue the power and high temperature tests on our 50 ohm
resistors. So far there have been no failures. If we choose the 75 or 100
ohm resistors, we will add them to our tests.