sPHENIX discussion of the superconducting solenoid

[Kin Yip <kinyip AT bnl.gov>]

Agenda and presentation files : https://indico.bnl.gov/conferenceDisplay.py?confId=2914


Probably, since the management people are in the Project WorkFest, we've had a quick meeting, not too long more than 15 minutes.

1.  I reported that Piyush Joshi, Carl Schultheiss & I met yesterday to discuss about the voltage tap scheme :

-- We've been talking about adding 4 more voltage taps.  But Piyush and Carl want to put a redundant at each joint such that we now have 2*4 = 8
-- We downstairs in 902 to watch the superconducting material being made with the copper structure.   You may see a couple pictures in my powerpoint :
   https://indico.bnl.gov/getFile.py/access?sessionId=0&resId=6&materialId=0&confId=2914

   Carl saw that the part with a flexible bend may move.  Even though Piyush said that they'd clamped, Carl still thought that there might be a possibility of
   a moving or vibrating superconductor that may cause a quench.  So, Carl is thinking of adding one voltage tap on each.

--  Carl will draw schematics and give it to R. Ceruti’s group and also Henry Hocker (as Mike Anerella). 


2.  P. Rosas has reported:  “We have started working on the sPHENIX PS, we are now working on the Regulator and analog controls of the PS.”

3.  A lot of drilling/tapping (+rigging) in the last ~10 days.  The no. of hours remained were reduced from 579 hours to about ~400 hours or so according to Jon Hock.
     From my powerpoint in indico: 
 https://indico.bnl.gov/getFile.py/access?sessionId=0&resId=6&materialId=0&confId=2914

you may see 6 vertical steel pieces have been installed at 902 around the base.   There are 6 more such vertical steel pieces to be installed.    Jon told me that
very roughly speaking, 2 pieces of steels were drilled/tapped in the last 2 weeks compared to 4 other pieces being drilled/tapped in the previous 2 months or more.

4.   A. Franz showed his 2D Opera simulation.  He compared the magnetic field in the center and outside the poletips (or doors), by changing the poletip/door thickness
 from 30 cm to 19 cm.  There is virtually no change in the central B-field ( gausses in ~1.4 T and even the leakage field outside poletips don't seem to change much.

His presentation/analysis PDF file can be found :

https://indico.bnl.gov/getFile.py/access?sessionId=0&resId=0&materialId=0&confId=2914