Feedthrough Meeting 19/09/97

present:  P. Birney, M. Fincke-Keeler, R. Keeler, 
          R. Langstaff, M. Lefebvre, P. Poffenberger

- Vacuum Cables
  We are expecting drawings from Ernie by the end of next week.
  We should then look at them and see if the design is mechanically
  sound.  If not we will then iterate back with Ernie.
  If we are happy with the drawings, we should then seek comments
  from BNL, especially with regards to the electrical soundness of
  the design.
  Costing for a prototype is under way in Ottawa.
  Michel to ask Bill Cleland about the acceptable dispersion in
  trace lengths. [done]
  Ernie to contact Terry next week for design questions.

- News from BNL
  Michel spoke to David Lissauer.
  They have now recieved most of the 54 PCT pin carriers ordered.
  Some have been found to fail after welding to the flange.
  They would like us, and in particular Terry, to help in doing
  a post mortem study, perhaps leading to design changes.

  BNL has also received a few 15-row glass pin carriers from 
  Glasseal.  They would like to order an important quantity of
  them for an "industrial" test.

  We agreed to first find out what tests they have done on them.
  We also agreed that we are interested in purchasing 4 or 6 of
  them for us here.

  Michel to find out when would be a right time to send someone
  (probably Paul) to BNL for assembly and tests help/training.

- Status of Drawings
  Roy has all the BNL drawings, and has already studied many of
  them in details.  Some problems were found, and have been 
  communicated to Jason.  In particular, Roy is proposing a
  modification of the seal ring - warm flange fitting.

  We agreed that it would be a good idea to have some of our BNL 
  colleagues, including Jason, visiting us in Victoria to go
  over the design, after October 27th.

- Model
  We discussed the construction of a feedthrough assembly model.
  All parts should be made as close as possible to the real 
  thing.  Blank pin carriers should be made.  Look alike cables
  as well.  
  Paul to look into ordering the material for the carriers, the
  flanges, the bolt ring, the funnel.
  Margret and Paul to look into the look alike cables.
  When the seal rings drawings are modified and ready, Michel
  and Paul should order one or two bellows.

- Assembly Procedures
  Paul prepared a set of drawings of the feedthrough elements.
  Paul and Margret will use them to produce a first draft of
  a sequence of steps for the assembly and tests.

  Various assembly jigs are considered, and depend on the orientation
  of the assembly for welding, and if tack welding is possible.

- Test Setup
  Paul has a working list of harware parts needed for the test setup.
  We agreed to go along with the 3 stop valve.  Paul is preparing
  the purchase requisition.
  Paul talked about feedthroughs for thermocouples.  Paul is currently
  planning on 4.  He is now looking into the thermocouples themselves.
  Richard pointed out that thermocouples generating sufficient
  voltage (10000 microvolts) at 80K is needed to avoid amplification.

  Pof reported that the cryocooler is perhaps in transit our way.

- Welding
  Paul has contacted the TRIUMF welder, and gave a few comments
  concerning tack welds.  No problem if care is taken not to have
  oxyde on the tack weld.
  Paul to inquire on Pressure Ticket Welder possibility at 
  TRIUMF.
  
- ATLAS meetings

  - Oct 06 - Oct 10  :  LARG week
  - Oct 13 - Oct 15  :  Feedthrough and Cryostats Review 
  - Nov 17 - Nov 21  :  Overview ATLAS week
  - Dec 08 - Dec 12  :  LARG week