Minutes of feedthrough meeting of 21 January, 2002.
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Present: Pof, GV, FH, PB, ML, AD, ASD

*) Milestones

	- Pincarrier cold cycling continues...

	- Started cabling ft26 (a standard) on Friday 18 January.

	- Rewelded ft24 bellows after defective vacuum cable(s)
	  were replaced; ambient vacuum tests passed and cold
	  test scheduled for later this week.  ft24 will be kept
	  cold for a longer period (~10 hours) than usual and
	  the Cirris continuity tests repeated at the end of that
	  period to check if any further problems might occur.

	- One warm flange was welded, and a replacement 
	  pincarrier was welded into a cold flange to replace 
	  a pincarrier that had gold in one of the glass 
	  beads.  Note that the minutes from last week (14 January)
	  reported that a replacement pincarrier was welded
	  into a cold flange to replace one that had gold on
	  a glass bead; the pincarrier replaced in that case
	  actually had a side-wall leak (presumably from welding)
	  and not gold on a glass bead.

*) The results of the ft25 cold cycle tests are listed here:

     1st cold cycle:

	- Channels 49 and 50 slots 11 short at LN2 temperature
	- Attempted but failed to "burn" short with 300 mA for
	  about 30 seconds.
	- All other channels ok at LN2 temperature.
	- Channels 49 and 50 slots 11 no longer short at 
	  room temperature.

     2nd cold cycle:

	- Slots 11 monitored during cooldown; channels 49 and 50
	  short at ~125 degrees K.
	- Channels 49 and 50 no longer short at ~105 degrees K.
	- Channels 49 and 50 still not shorted at LN2 temperature.
	- All other channels ok at LN2 temperature.
	- Channels 49 and 50 short again ~125 degrees K
	  during warmup.
	- Channels 49 and 50 slots 11 no longer short at 
	  room temperature.

     3rd cold cycle:

	- Slots 11 monitored during cooldown; channels 49 and 50
	  short at ~140 degrees K.
	- Channels 49 and 50 still shorted at LN2 temperature.
	- (No other channels check at LN2 temperature.)
	- Channels 49 and 50 slots 11 no longer short at 
	  room temperature.

     4th cold cycle:

	- Slots 11 monitored during cooldown; channels 49 and 50
	  short at ~125 degrees K.
	- Channels 49 and 50 still shorted at LN2 temperature.
	- All other channels ok at LN2 temperature.
	- Channels 49 and 50 slots 11 no longer short at 
	  room temperature.


   In Summary the short in slot 11 was present in three of the 
   four trials at LN2 temperature; on the other trial the short 
   occurred at an intermediate cold temperature (~125 degrees) 
   but opened again at a lower temperature (~105 degrees).  The 
   short in slot 11 was never present at room temperature.  In
   the three of the four trials where all other slots were
   measured at LN2 temperature, no other shorts occured.

*) Neil is making some "opposite short" monitoring devices to
   monitor all channels continuously during cool down in the
   the cold test station.  A buzzer will sound if any channel
   shorts, and led's will indicate which slot is involved.
   Approximately half should be finished before the end of 
   this week.

*) Pierre Pailler circulated the following note on Friday 
   January 25 regarding the status of ECC:

	Dear Colleagues,

	I had today some good news from the Cryostat End cap C.

	The 4 bellows of the LN2 supply lines (one of them was 
	leaking after the pressure test) have been replaced.

	The result of the global leak check on the vacuum was better 
	than 10-8 mb.l.s-1.

	The pressure in the vacuum chamber is between 10-4 (according 
	G. Mace) and 10-3 mb (according S. Prat). Both values are 
	acceptable!

	We expect to have the cryo-line connections done next week 
	in order to start the cooling as soon as possible.

	Filling is expected to start during the LArg week.

	Delivery expected mid March.

	Best regards, Pierre

*) The "minutes of local meetings" web pages (ie, these minutes)
   are now password protected from sites outside of .uvic.ca;
   use userid=uvic, password=insider.

*) Manpower issues were discussed, with Greg leaving at the end
   of the month to take his new positon at UT working with (among
   other things) the undergraduate labs (he will even be putting 
   his LabView skills to use!).  Tayfun will be be trained to take 
   over much of the pincarrier cold cycling and leak tests; Aaron 
   will work out a schedule to see how much of his time will be 
   required.  If necessary, at least one other graduate student 
   could be pulled in to assist in some task taylored for the time 
   available.

*) Greg is working on a web link from our "feedthrough status" 
   pages which will access the database and return serial numbers
   of all components as well as other information.  The link
   is a Perl script running on the Micro$oft server hepserv.

*) Pof has sent a reminder to Tom Muller for the pincarrier
   material specs.

*) Pof contacted Bob Hackenburg of BNL to discuss a few issues.
   BNL had about 120 vacuum cables failures (many of them 
   "opposite channel" shorts) found during testing.
   FCI has balked about replacing these cables, due to the
   long time since they were delivered.  Bob thinks (but is
   not sure) that BNL has somehow persuaded FCI to replace
   the defective cables, in which case any unused cables will 
   be set aside in case they are needed for the EndCap feedthroughs.

   Bob will send me one of the warm cables this week.  He will
   also email to me the ordering information for the power and
   RTD connectors for the flange heaters.

*) Five drawings still need to be placed on CDD by Roy before
   the "drawings" section of the QA/QC document can be completed
   (so that the correct CDD numbers can be referenced).

Agenda for next week
^^^^^^^^^^^^^^^^^^^^
- Milestones
- report on testing of defective vacuum cables
- new web pages
- Plans for the week
- AOB