Minutes of feedthrough meeting of July19, 1999.
Present: MF,RL,PB,AD,GV,RM,TH

1. Aaron produced an assembly flow chart with reference labels for the
   various cleaning procedures and a table detailing each of the procedures.
   An appended technical sheet on the vacuum grease we commonly use states
   that the grease is not soluble in alcohol or acetone and gives a list of
   solvents which will disperse the grease - unfortunately they did not sound
   attractive.  It was pointed out that there should be no vacuum grease on
   the liquid argon surfaces of the feedthrough since vacuum tests are made
   using O-ring connections on the other surfaces.  General cleaning of
   components could be done at TRIUMF in Chris Oram's ultrasonic baths. Chris
   uses them to clean both copper and stainless components so he will
   probably not be averse to our using them occasionally.  The difficulty of
   cleaning some components, particularly pin carriers, revived the idea of
   fitting cover plates over the pin carriers immediately after they have
   been received and inspected. In general we will attempt to build the
   feedthroughs so as to avoid introducing foreign materials but Margret
   suggested we might do a trial assembly with someone taking notes to
   document possible sources of contamination. An example of a possible
   source of contamination could be from welding gloves (probably mandatory
   protective wear) which might have grease etc. from previous jobs - we
   might want to provide clean gloves for our welding jobs.  It was felt that
   when the feedthroughs were to be shipped, they would be bagged in
   polythene film tubing, purged with dry air or nitrogen, and sealed with
   desiccant inside.

2. Roy finished the interface drawing and has sent it to Aboud and Pierre
   for comment before releasing it.  The purchase requisition, together with
   new drawings, for five bellows was taken to the Purchasing Office on
   Friday. The drawings for the Seal Ring and Bellows Cuffs will be finished
   later this week and the bid requests out by Friday.  Roy expects the five
   finished Bellows Assemblies here by October 7.  Roy will continue updating
   the BNL drawings and Mark or Greg will build the assemblies from the
   parts, to check there are no mistakes.

3. It was decided not to proceed with work on the five dummy flanges,
   which are on "hold", until we have discussed the weld preparation on the
   Cold Flange with the welder and Paul has returned from holiday in three
   weeks.

4. Margret raised the problem of cable restraint (or lack of) in the
   feedthrough.  There was some debate and a few possible solutions suggested
   - it was agreed to have further "brainstorming" on this important problem.

5. Paul produced tables showing the time estimates for each step in the
   mechanical assembly of the feedthrough. The times for the electrical
   assembly and tests are to be added.

6. Paul and Aaron will produce a time and manpower chart for the
   assembly of one complete feedthrough

7. Rob has the Orsay scanner board assembled and running under Labview.