Minutes of feedthrough meeting of 12 June, 2000.
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Present: GV, Pof, PB, MLenc, AD, TH, RL, RKK, MGF, RM

*) Milestones:

	- remaining cuff and seal rings crated and ready
	  to ship to BOA

	- Glasseal announced a revised shipping schedule -
	  eight pincarriers of each type to be shipped
	  to UVIC every other week beginning 10 July.
	  Subsequent news from BNL, however, has revealed
	  problems with the 16 pincarriers recently delivered
	  to BNL; 14 of the 16 developed leaks after cold
	  cycling.  A crew from Glasseal visited BNL to
	  investigate the problem, and were confident that
	  they understood the cause of and cure for the 
	  defect.  It remains uncertain what impact this
	  will have on the shipping schedule.

	- The replacement transducer for the ultrasonic bath 
	  is finally in place.  On Thursday, PB and GV or AD 
	  will clean at least two each of the warm flanges, 
	  cold flanges, funnels, and bellows.  

*) Samples of the thermal pads (both types) should be sent
   to Chris Oram for radiation testing.  PB can deliver these
   to Chris while in Vancouver for the ultrasonic cleaning.

*) Sicom responded to the RFQ for the supplemental cuff-ring
   order at $535 per piece.  Southern Cross has not yet
   responded.  We should also look into the possibility of
   having Dave Smith make the cuff rings (minimum three, no
   more than five).

*) Mark will put out an RFQ for the bellows braces.

*) The orders for the RF seals and the SealRing/Cryostat 
   o-ring seals should be placed (PB).

*) Terry will notify Pierre Pailler and Allain Gonidec that
   he will be presenting the UVIC ambient flange heater design
   and test results during the July LARG week, and that all
   interested parties should attend.  We would like to have
   final approval of the heater during LARG week or soon after,
   as it is holding up the hole drilling of most of our warm
   flanges.

*) Roy reminded Albin that we require the repaired T-piece
   glands ASAP.  Albin responded that the shop had yet to
   repair any glands, but expected that the shop will try
   to polish the first piece on Wednesday.  If the repair
   fails, then Albin will send us the four least damaged
   T-pieces along with their measured leak rates.  

*) It was decided that after the final welding and testing of
   the feedthroughs, we will stage several (up to six) feedthroughs
   for the dye-penetrant tests to be performed.  This implies that
   the feedthroughs will not be crated, but will be held on
   cradles and covered to keep them dust free.  The cradles and
   covers will have to be made.

*) In addition to the large poly bag which will envelope the entire
   feedthrough in the crate, a smaller poly bag should also be
   used to protect the pigtails before insertion into the large bag.
   Furthermore, each micro-D connector will be protected with
   a 0.004" 3X5" poly bag.

*) Mark will look into obtaining a large shipping container to 
   hold each batch of feedthrough crates.

*) Pof contacted Bob Evans of FCI regarding the delivery schedule.
   FCI has had delivery problems with the BeCu, with a 26 week
   lead time, but did receive several thousand pieces last week.
   We will recieve another shipment (several hundred?) before
   the end of the month.  I will request clarification on how 
   the `26 week lead time' will impact future deliveries.  Bob
   also acknowledged that some of the springclips "may be slipping
   over the front of the Minirod housing". 

*) Mark has provided the following summaries of the proposed BNL 
   and UVIC heater-plate temperature sensors:

	BNL summary
	^^^^^^^^^^^
	- Two RTD temperature sensors per feedthrough (BNL delivery 
	  is within days).
	- BNLs RTDs are custom made, they have metric threads and 
	  kapton wire.
	- RTDs attach directly to warm flange adjacent to pumping 
	  ports.
	- BNL heaters are made in two halves.  The heaters temperature 
	  is measured indirectly via thermal conduction to the warm 
	  flange RTDs.

	UVIC summary
	^^^^^^^^^^^^
	- We will use two RTDs per heater plate.
	- Our RTDs have same calibration as BNL.  Ours are also custom 
	  orders, Kapton wires eh.  US$44.15 each for 120, US$50.70 each 
	  for 60.  Delivery is 4 to 5 weeks, quotation valid for 30 days 
	  (as of June 9).  Sketch available in the office (rm203).
	- Connector type has not been established yet.  BNL will figure 
	  something out within a couple months, at which time we will 
	  probably copy it.
	- Our two RTDs will be mounted centrally on the heater plate.
	- We will be using 6 resistors per heater plate with a 2 amp fuse 
	  in series with each resistors.  All resistors are connected 
	  in parallel.

Agenda for next week:
^^^^^^^^^^^^^^^^^^^^^
- Milestones
- ultrasonic bath report
- T-piece glands from CERN
- projected schedule for construction of FT0
- AOB