Minutes of Feedthrough Meeting of 24 June 02
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Present: Pof, FH, WW, AD, RKK

Milestones:

	- ft48, ft49, and ft50 welded.

	- final electrical tests complted for ft47.

	- ft48 and ft49 cold tested without problems.

	- Eight feedthroughs (ft29-35, ft38) were shipped
	  to CERN on 21 June.

	- 28 ambient flange heaters have been complted;
	  all but two have been tested.  Wendy has nearly
	  completed the heater tables for the feedthrough 
	  data base, but needs to cooridinate with Jan a
	  few remaining details.
	  The Y-jumpers to connect the heater power wires 
	  of pairs of feedthroughs to the filter box are
	  being made by Neil, but cannot be completed until
	  we resolve an ambiguity regarding which wire
	  is "hot" and which wire is ground.

*) A test of a prototype "heater shunt" to provide extra heating
   power to the HEC LV warm cables was done during the cold test of
   the HEC feedthrough ft48.  The test was far from perfect.  Ideally
   one would want to monitor the temperature of a pincarrier pin
   with a LV cable attached.  Since this is not (easily) possible, 
   we can only moniter the temperature at those parts of the pincarrier
   body still accessible when a cable is attached.
   We attached a copper shunt, thermally connected the heater
   plate, to a LV cable on slot 14A.  Another copper "floating" shunt,
   not thermally connected the heater plate, was connected to
   a LV cable in slot 14B.  The flange heater was kept at a
   temperature several degrees above ambient.  As expected, the
   temperature of the "floating" shunt was several degrees cooler
   than the shunt in thermal contact with the heater plate.
   Several temperature measurements were also made at the bases
   of the warm flange pincarrier slots.  Those slots furthest
   away from slots 14 and 15 (the slots with the LV vacuum cables)
   were warmer by several degrees than the slots immediately
   adjacent to slots 14 or 15.  This suggests that the temperature
   of the pincarrier body adjacent to the LV slots is effected
   by the cooler temperature of the pins, and therefore is a
   reasonable measure of the effects of the heater shunt.
   On the other hand, there was no measurable temperature difference 
   between side A (with the thermally connected heater shunt) and 
   side B (with the "floating" heater shunt) suggesting that the 
   extra heating power provided to the pins by the shunt is negligible.
   The general consensus is to not use the heater shunts, but 
   rather operate the HEC ambient flange heaters at an elevated
   temperature to accommodate the greater thermal conductivity
   of the LV warm cables.

*) All exisiting parts for the final four feedthroughs (ie, everything
   except the pigtails for the last three feedthroughs) will be
   organized this week, both physically and virtually (ie, entered
   into the database) so that there will be no ambiguities regarding
   which parts belong with which feedthroughs while Fiona is 
   away at CERN.

*) Michel sent this information from Daniel Fournier regarding
   the pigtails with the "new" micro-D connectors:

	I had a brief chat with Daniel Fournier regarding the
	pigtails.  The connectors will be tested "in
	September", but the pigtail delivery will procedd as
	if nothing had happened.  So I suspect that sometimes
	in September we would be given the OK (or else!).

*) Patrick Fassnacht reports in the B180 minutes of 17 and 24 June
   that the first welding of one or two feedthroughs onto ECC
   is scheduled for Friday 5 July.  He also reports that from 
   now until mid-August there will be two technicians from LAL
   to assist Aboud with feedthrough installation, in addition
   to the (wo)manpower provided by UVIC and support from Alain
   and Victor. 

*) We foresee the final feedthrough shipments to CERN to
   be as follows:

	two Standard/Special 4-packs:

		21 June (already shipped)

	two Standard/Special 4-packs plus one HEC 4-pack:

		August, or when available storage space
		at CERN permits.

	one Standard/Special 4-pack plus one FCAL:
	
		At end of construction; the Standard/Special 
		4-pack should consist of three Standards
		plus one (spare) Special.

*) Fiona, Wendy, and pof will be leaving for CERN next Tuesday
   2 July.  Fiona and Wendy are making plans for the chocolate
   train...

Agenda for next week (Tuesday 2 July)
^^^^^^^^^^^^^^^^^^^^
-Milestones
-Plans for the week
-AOB