sPHENIX discussion of the superconducting solenoid

["Yip, Kin" <kinyip AT bnl.gov>]

Agenda and powerpoints (including Roberto Than/Paul Orfin’s) :

 

https://indico.bnl.gov/conferenceDisplay.py?confId=3027

 

 

1.      Ray Ceruti reported that apart from a (flex) connector that they’re purchasing, they’re done with Cryo Extension assembly in Bldg. 902 (SMD).

He’s been walking back and forth between Bldgs. 902 and 912 to check on the doghouse and Cryo Extension connections to see what he may do now before the Extension can be brought to Bldg. 912 for real “connections”.

2.      I showed Jon Hock’s progress histograms.  We can see that flame cutting has been 100% done and they’ve made some progress in tapping/drilling and assembling.  He’s planning to install the Magnet (Coil/Cryostat) on Apr. 28, 2017, which was about a week later than the Microsoft Project (https://collab.external.bnl.gov/sites/sPHENIX-Magnet/Shared%20Documents/High%20Field%20Test/High%20Field%20Test%20Schedule.mpp) had predicted.    

Ed O’Brien told us that he’s asked PHENIX technician Mike Lenz to J. Hock for various aspects of the return steel construction works.

3.      P. Rosas reported in email (for his works in power supply/dump resistor) : “We are moving along, we may go a little into next month.”

4.      D. Phillips reported in email : “Nothing has been done to finalize the initial layout done over 1 year ago. It needs to be optimized for cable routes and access requirements. I need to get together with Pablo to do this. ”  Ed O’Brien is also trying to get Brian Streckenbach to help.

5.      There was a technical meeting this morning among C. Schultheiss, J. Sandberg, B. Lambiase, C. Theisen, Z. Altinbas, W. Pekrul and myself.  They aim at June 15 to have a tested data-acquisition and quench protection system.

Tom Tallerico told us some details in his purchasing progress and work divisions.   We’ll get the 3 5-pin connectors in 8-10 weeks (the PO is being approved by various people today) .   After the meeting, it seems that we can’t get the 1/10” pitch cryogenic Dsub connectors from www.cmr-direct.com (as they have only the 1/20” ones).  Tom is now trying :   http://www.iceoxford.com/Cryogenic-spares/Cryogenics/Connectors.htm .

6.      Roberto Than sent me a powerpoint before the meeting and P. Orfin helped give the talk (as Roberto needed to leave early).  They’re discussing what they’ll do without the sub-cooler to cool-down the magnet.  The two main factors that I understand :

(i) Increase the operating pressure from 1.35 bar to 1.8 bar ;

(ii) Use a different path such that they can reduce the no. of valves by two.

After the meeting, Roberto also told me that one of the reasons that the long coaxial cable caused so much pressure drop may be due to too much bend in the cable/pipe.  This time, they can make it straighter and we may get some improvement here, too.