Minutes of feedthrough meeting of 8 May, 2000.
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Present: GV, AD, Pof, MGF, PB, RM

*) Milestones:

	- 60 ColdFlanges and the 8 remaining WarmFlanges
	  have been received from Ebco.  The unused blank
	  material was not included in the shipment.  PB 
	  will check with Ebco about the remaining blanks.

	- 100 Vacuum Cables arrived on 4 May.  All have 
	  been visually inspected.  Aside from one cable
	  that appears to have some missing gold plating
	  on the springclip (this needs to be investigated
	  more carefully under a microscope) all the cables
	  have passed.  Contrary to the information we
	  were given by FCI, there is no mark on the connector
	  to designate the pin one position.  We will provide
	  our own mark.  Electrical tests are underway, and
	  anticipated to be completed by next week.

	- Replacement Pigtail labels have been ordered by
	  ORSAY from Axon to relabel the pigtails.

*) Margret reported that the gland delivery from CERN has
   been delayed until the end of May.  CERN has now recieved
   the glands, but must perform further machining before
   shipping to UVIC.

*) Some concern was expressed during LARG week about the
   pigtails picking up dust if left uncovered during the
   assembly steps.  We will make some sort of protective
   cover for the pigtails once they have been plugged into
   the coldflange.

*) Pierre Pailler expressed some concern during LARG week 
   about the heater resistors failing if they get wet due
   to condensation.  PB will build a device to wet/dry cycle 
   some resistors while powered.  Some of the resistors will
   also be subject to freeze cycles while still wet.

*) Still no word from Glasseal regarding a revised schedule.
   George Stenning has left many phone messages with Glasseal,
   but has received no reply.  George will contact Roy or
   me (since Terry away for two weeks) once anything new is 
   learned.

*) PB performed thermal conduction tests with the proposed
   thermal contact material, thermal grease, and just air.
   His results are presented here:


                Thermal coupling of Resistors

Four 50 watt resistors were mounted on a water cooled aluminum plate and
heated with 18 watts each. The resistors were coupled to the plate by:- 

1) air,
2) white grease, 
3) CT-100 rubber pad 0.8mm thick, 
4) C695 graphite pad 0.15mm thick. 

Three tests were done:
 
1st) The resistors were screwed tightly to the aluminum plate.
2nd) 0.1mm paper washers were placed at the two screws between the
        resistors and the aluminum plate.
3rd) 0.5mm SS washers were placed at the screws between the resistors and
        the aluminum plate.

The temperatures of the resistors were recorded.

                Air     White grease    TC-100 Rubber    C695 Graphite
                                        0.8mm Thick          0.15mm Thick

Test #1         40 deg       37 deg         46 deg              37 deg

Test #2         58           40              49                 54

Test #3         80           46              71                 69      



*) Preview of next week's meeting ---

	LOTS of goods have arrived, including funnel bases, 
	cables from AXON, bellows, and the new leak checker.
	Details to follow next week.

Agenda for next week:
^^^^^^^^^^^^^^^^^^^^^
- Milestones
- Preliminary vacuum cable test results
- Inventory of parts required to commence building
- Work plans for the immediate future
- AOB