sPHENIX discussion of the superconducting solenoid

[Kin Yip <kinyip AT bnl.gov>]

There are quite a few files of slides shown here and all can be found in :

https://indico.bnl.gov/conferenceDisplay.py?confId=1155


1.  P. Joshi showed his modified power supply/DAQ block diagram (after last Thursday's Mechanical Design Review).  In addition to
     some ground protection, he's added a current regulator outside the power supply and together with operating the power supply in voltage
     mode, it'd avoid any problem with the high inductance (our ~2.3 H) .


2. We've reviewed the slides that M. Anerella and R. Than have prepared for the PCSS review this Friday (1 pm in Bldg. 490 conference room).
    Mike will add 1 or more pages and made some modifications and he's promised to send us his slides at least by Monday morning.  

    During our review discussion, we'd like to try to find out what fraction of energy (of a total of 27 MJ) remains in the coil and not dissipated
    in the dump resistor.  ( Piyush said that generally at least 50% goes to the dump resistor. )   By chance, I brought a "initial quench data" (of BaBar's)
    to Bob Lambiase last week and he's going to try to see whether he can figure out this fraction from the data.

3.  Also, Roberto told us he heard from Wes (from SLAC) that half of the strain gauges (of this solenoid) didn't work.   Paul Giannotti will work with Richard Meier
    (of the Cryo Group) to try to measure resistance (etc.) to see whether/how many strain gauges work or not ...

    Roberto also discussed about the necessity to do leak check for the valvebox/chimney (as there was leak before in SLAC)  and  he's also making purchases
    for components for the vacuum jacket lines (for our low-field/high-field tests) --- totalling ~$53K.