sPHENIX discussion of the superconducting solenoid

[Kin Yip <kinyip AT bnl.gov>]

Agenda/powerpoint: https://indico.bnl.gov/conferenceDisplay.py?confId=1636


1. The actual field joint works, two times of welding with a pressure 
test/leak check in between,
   have finished.  After the vacuum level went to 15 mTorr, Roberto has 
switched to the Turbo pump.
   On Monday, Mike Gaffney will witness the OFFICIAL pressure test/leak 
check, with help from
   the C-AD vacuum group who supplies the mass spectrometer etc.

2. R. Ceruti et. al. got the Heat Shield from the BNL central shop :
   
https://collab.external.bnl.gov/sites/sPHENIX-Magnet/Pictures/Heat%20Shield%20inside%20the%20junction%20box.jpg
  
   At the moment, Ray cannot install this heat shield inside the junction box (or called "doghouse") as the strain
   gauge cables (etc. ?) are not dealt with yet.

3. R. Ceruti has also reported that the mechanical portion (bellow) for the 
linear potentiometers  have been installed
   but he and Sonny will calibrate the actual linear potentiometers and find 
the mid-range etc.  before they can
   install them.

4. We discussed about the connections (without P. Giannotti's presence).  In 
Piyush's understanding, Paul will be
  responsible for the strain gauge (including the few temperature required 
for the strain gauge temperature correction);
  whereas Piyush is responsible for the power supply and quench protection 
connections.
  
5. We discussed about the BaBar refrigerator that Wes Craddock has mentioned to John Haggerty and asked whether we want it.
   The consensus in the discussion seems to be that we want the refrigerator, 
together the compressor (if available) etc.
   Roberto said that this refrigerator can be a removable module that we may 
use for sPHENIX or RHIC etc.   The size of
   the refrigerator just needs 1 truck and if the compressor is also to be 
shipped, it'll be 2 trucks ... Roberto will
   communicate with Wes and Wolfram Fischer (to see whether he's interested) 
and Ed O'Brien will also talk with Wolfram
   to see whether he's interested to share the cost of delivery :-)

6. From the Cost and Schedule Review in Nov., it's suggested that we 
consider/evaluate the field mapping scope as well
   as the issue of the standalone cryo plant vs a plant tapping into the RHIC 
system.

   Achim Franz will study and write a document to see whether we may get away 
without doing the so-called CERN mapping
   (that he's proposed for a while).   Roberto has told us that with this BaBar 
refrigerator, we can have an "in-between"
   version such that we may move the Refrigerator out to cool the Solenoid 
Magnet for extensive field mapping exercise
   and then move it back to tap into the RHIC system after the field mapping 
is done.
 
   We heard that Wuzheng Meng may stay in BNL until Mar. 31 and there is a rumor that Holger Witte may help us with the
   magnetic field calculation/simulation in the future.