Minutes of feedthrough meeting of 14 November, 2000.
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Present: PB, Pof, TH, RL, MLenc, MGF, ML

*) Milestones

	- 130 T47 and T48 pigtails arrived from Orsay on
	  8 November.  All have been processed and tested.
	  We now have a total of 629 pigtails from Orsay plus
	  60 pigtails ordered by us directly from Axon.

	- ft02 was welded on 7 November.  Cold tests will be
	  performed this week.

	- The wire and heat shrink tubing for the ambient
	  flange heaters has been delivered to Rob's office
	  in Geneva, and will be shipped to UVIC.

*) Aboud acknowledged receipt of Michel's email regarding the
   "Operations list ..." document.  Aboud will distribute
   a revised copy in the near future.

*) Ten T51 pigtails ordered by us directly from Axon will
   be returned to Axon for electrical testing using the
   Orsay test setup.  One cable from the 8 November batch
   will also be returned since it tested with an open
   channel.

*) Orsay wants us to replace all the retainer clips for the
   pigtail ATI jackscrews, since the existing retainer clips
   are subject to rust.  Replacement retainer clips are packaged
   with the next lot of pigtails, which `is in the mail' now.

*) Michel reminded us that we will have a production review at
   the 10% completion point (~5 feedthroughs).  He also noted
   that we might want to host some sort of ATLAS meeting in 
   Victoria.

*) We had a discussion of whether we wanted our shipping crates
   to contain one feedthrough or two.  After some discussion,
   the general consensus was that one feedthrough per crate is
   preferred, since the crates could then be easily moved by
   two people without the aid of a lift, and also to avoid
   the possibility of lots of half-empty shipping crates lying
   about during installation; the order of installation might
   not match the way the feedthroughs are paired if two 
   feedthroughs are in each crate.  Mark will prepare some 
   `one feedthrough' crate designs for consideration during
   next week's meeting.

*) Mark received verification from Allain Gonidec that 4-wire
   RTD's are to be used for the ambient flange heaters, with
   two RTD's per feedthrough for redundancy.  Note that there
   will be one power supply per feedthrough, supplying power
   for both RTD's on the feedthrough.  Allain estimated the
   distance of the cabling from the HEC cryostat to the heater 
   power supplies and temperature readers/controllers to be
   of the order of 100 meters.

*) Mark has found an appropriate temperature controller from
   Omega that can handle both 3- and 4-wire RTD's, can be 
   interfaced to a computer, plus lots more...  Mark has
   also found a power supply from Watlow, although it is
   AC rather than DC so it will have to be rectified and 
   will also require a step-down transformer.  The temperature
   controller and power supply will be ordered this week.
   
*) Horst Oberlac has requested a UVIC contact for information 
   regarding the welding of two PCT pincarriers (provided by us)
   to a flange.  PB and MGF will provide MPI with the appropriate
   weld parameters.

*) PB has received no reply from Helio regarding the RF seal
   and O-rings.

*) We need to understand at what point the electrical tests
   are to be performed at CERN after the welding of the
   feedthroughs.  Are the tests done before or after the
   connection of the warm cables?  It is probably preferable
   to do the tests after the warm cables are attached, both to 
   minimize the number of plugins to the warm flange pincarriers,
   and to catch any potential pins bent when the warm cables
   are plugged in.  If the tests are done after the warm cables
   are attached, then we need to integrate the appropriate
   interconnect cables (with appropriate connectors to accommodate
   the warm cables) into our test setup.

Agenda for next week:
^^^^^^^^^^^^^^^^^^^^^
- Milestones
- pincarrier news
- ft02 cold test results
- Shipping crate plans from Mark
- AOB