sPHENIX discussion of the superconducting solenoid

[Kin Yip <kinyip AT bnl.gov>]

[ Agenda page: https://indico.bnl.gov/conferenceDisplay.py?confId=1239 , 
where you can find today's slides ]


Summary of important points (in my opinion/that I've remembered/written down) 
:

1. Looking at the schedule, the Cryo group may be a little behind in 
designing/procuring Coaxial VJ lines. There are
just the critical lift safety paperworks/procedures before we can rotate the 
Magnet (Junction box) --- likely next week
if we can find the riggers.


2. I've mentioned a few activities that are going on, such as the Cryo 
Group/C-AD is in charge of the vacuum work (with
help from the vacuum group/C-AD if needed), P. Giannotti sorting the 
connections with the Cryo Group --- I see them
spend another hour or two after the meeting again and W. Meng having 
calculated and sent to the results for J. Cozzolino
to do ANSYS analysis on stresses.

3. P. Giannotti has finished checking all the connections.  In addition to 
shorted MT07 in the junction box, he has found
HT02, HT09 and ST12 that have failed --- they will be marked in the Cryo group's 
P&ID if they cannot fix/replace it.
( I try to keep a copy ：

https://collab.external.bnl.gov/sites/sPHENIX-Magnet/Shared%20Documents/Forms/AllItems.aspx?RootFolder=%2Fsites%2FsPHENIX-Magnet%2FShared%20Documents%2F100%20A%20Test

whenever Roberto sent me)


4. We've assigned names for the responsibilities of 13 action items of the 
PCSS review (May 22, 2015).  The most troublesome
one was the calculation of arc flash in the lead pot vessel ("inspired" by 
the CERN accident a few years ago) where is the only
place that an arc flash could lead to helium expansion/explosion.

5. P. Orfin showed electrical breaks attached to the electrical leads.  It's 
decided that we just need to do hypot test (~520 V) to verify
that they're OK.

6. We have spent some time in discussing whether it's worthwhile doing some 
magnetic field measurements to determine misalignment.  It's
generally thought that it's a non-trivial task to determine it accurately (in 
both magnetic field and position) and it may require a lot
of works. But we can certainly measure it roughly to determine whether the 
central field is what we have expected (about 300 Gauss).
While we (esp. Achim :-) will continue to think about this, I've just sent an 
email to ask Pasquale to see whether he's got any experience
to share.


Kin