Feedthrough Meeting 20/11/98

present:  P. Birney, A. Dowling, M. Fincke-Keeler, 
          T. Hodges, M. Lefebvre, P. Poffenberger, G. Vowles

- Opening Comments

The ATLAS project celebration will be held Thursday December 17th at
10:00 in Elliott 022 (the ATLAS lab).  General invitation to be sent
next week.  Michel pointed out that the lab should be in proper
order for this gathering.  Sensitive equipment should be cordoned
off.  We don't want anyone to get hurt either, so special attention
to security.

A PRR preparation meeting is currently being organized.  If it
occurs, it will be during the week of Jan 4th 1999.

- Pin Carrier Status

Terry succeeded in contacting Glasseal.  They have had problems with
their procurement of the last 5 pin carrier bodies.  Terry was told
that the last pin carriers are to be expected next week.

Greg, reported on the pin carrier tests.  In summary:

   15 Glasseal received (5 more to be received soon)
      1  dented, with 10**-9 leak
      14 with no room temperature leak
         6 were temperature cycled 6 times
            2 developed 10**-9 leaks that did not get worse during
              cycling
         2 are reserved for long term cycling

   10 PCT received
      1  with 10**-9 slow leak
      9  with no room temperature leak
         6 were temperature cycled 6 times, all ok.
         2 are reserved for long term cycling

All test results are carefully logged.  Pof to verify with Michael
on the backup issues.

Experience is being gained on the calibration of the leak
measurement.  We agreed that a measurement of the calibrated leak
should be done before and after the leak tests of pin carrier
batches.  Effects of the rubber contamination with He is understood
but requires care.  One possibility is to change the rubber seal or
platter if problems occur.  It was argued that changing rubber for
each tests was an overkill.

We agreed that the next temperature cycling will be for
  6 Glasseal from the 14 above not yet temperature cycled
  2 PCT that have not yet been temperature cycled, including the one
    with a slow leak
  2 Glasseal that developed a small leak during first cycling
  1 BNL pin carrier, the one that we have not been able to measure a
    leak

It was reminded that we have identified 5 pin carriers for long term
temperature cycling
  1 BNL pin carrier, with a measurable small leak
  2 PCT
  2 Glasseal
  
- Welding Status

On Friday Nov 6th, Paul went to TRIUMF with one dummy flange set
(warm flange alike 3/4 inch dummy with 4 pin carrier blanks), and a
few weld test metal pieces.  The welding parameters were optimized
by Rowland on the practice metal pieces, and were noted.  The blank
pin carriers were then welded in the dummy flange.  A deflection of
0.2 mm was measured.  Given the smaller thickness of the dummy flange,
Terry said that this was compatible with the FEA results he has
obtained when simulating welds on a real flange.

A metallographic analysis of the welds was made by Coast Testing,
with the following comments:
"... A leak test was conducted on all welds using a visible dye
penetrant method.  No indication of any leak was observed. ... The
metallographic structure of the welds and heat affected zones were
normal for the material; there was no evidence of unacceptable
anomalies such as cracks, pores or non-metallic inclusions".

We have receive our welder.  It's a Miller TIG welder, 300A max.
All electrical connections and wiring complete.  Minor work still
required by the plumber.

- Plans for Pin Carrier Welding

The 3 remaining blank flange sets are expected next week.  The first
thing to do is to measure their dimension and deflection carefully,
and log the results.

Terry contacted experts at CERN concerning the annealing issue, and
has recorded the annealing process in use at CERN.
            
After discussions, we agreed on the following plan (see also minutes
of last meeting):

  - "non annealed" actions
    Weld a complete blank set, and measure deflections, leak tests.
    Weld 4 Glasseal pin carriers (with no detected leak) in an
      ambient flange, measure deflections, leak tests.
    All this should be done with our welder in Victoria.
    This could be done as early as Friday Nov 27th.
    Paul to Contact Rowland for availability.
    Since this will be the first time this will be done in Victoria,
    we agreed not to attempt to do more on the weld front that day.

  - "annealed actions"
    Paul and Terry to investigate where the annealing of the flanges
    could be done.
    Then one blank flange and one ambient flange should be annealed
    treated, and deflections noted.

- Plans for Bellows Tests

  The bellows have been received.
  Special tooling has been made for the leak tests of the bellows.
  We agreed to discuss the pressure test of the bellows at a later
  date.

- Plans for Assembly and Tests

  We briefly reviewed the tasks ahead, including
   - welding of a total of 4 flanges, tests.
   - think about putting temperature probes in the bellows for tests
     with low voltage vacuum cables.
   - further temperature cycling of selected pin carriers.

- ATLAS Meetings and Other Important Dates

  - Dec 17 10:00     :  ATLAS Celebration in 022
  - Jan 4 ??         :  PRR Preparation meeting in Victoria
  - Jan 11 - Jan 15  :  LAr week
  - Jan 29           :  Feedthrough Production Readiness Review
  - Jan 31           :  ATLAS NSERC Review (to be confirmed)
  - Feb 12 - Feb 14  :  Western Nuclear and Particle Physics Conference
  - Feb 14 - Feb 20  :  Lake Louise Winter Institute
  - Feb 22 - Feb 26  :  ATLAS week
  - Mar 15 - Mar 19  :  LAr week
  - May 17 - May 21  :  LAr week
  - Jun 07 - Jun 11  :  ATLAS week
  - Jun 16 - Jul 07  :  HEC testbeam
  - Jul ??           :  LAr week
  - Aug 18 - Sep 08  :  HEC testbeam
  - Mar 15 - Mar 19  :  LAr week