sPHENIX discussion of the superconducting solenoid

[Kin Yip <kinyip AT bnl.gov>]

1.  Linear potentiometers have been calibrated by Sonny and Ray.    Piyush has got the calibration constants etc.  
    Sonny and Ray will put them in when they find a common time to do so.

2. For the power supply rack, Sonny/Piyush smelt something not very nice and they had to replace the power supply this morning.
    Now, they let it sit for a few hours and Dave Phillips reported that the riggers will help them move tomorrow morning.

3. Technicians from the Superconducting Magnet Division are pulling strain gauge cables/wires today.  After that, Paul Giannotti will
    need a day to get put the wires in the correct channels in the strain gauge rack (already in 912), hopefully by the end of this week.
    Paul told us that 2 pins/connections are bad, one in J4 cable and another in J5 cable, which means that two strain gauges will not
    be read out successfully.

    In the long run, Paul is suggesting that we replace all J1-J6 connectors as they've aged and manipulated/bent too much over the days.

4. The central shop welders are busy with NSLS works and so the Cryo group is not able to find any welders this week.    Ed O'Brien has
    sent an email to ask Joe Tuozzolo to help find us one as soon as possible, such as this weekend or next Monday.    Moreover, the Cryo
    group has been tied up with works in CeC, some small pipings for sPHENIX Magnet haven't been finished and Paul Orfin thinks they
    should be finished by next Wed.

5. Because of the above delay, I'm trying to reschedule the walkthrough on Feb. 3 afternoon (originally on Jan. 29).

    And, our target date for cool-down is now Feb. 8 (Monday), instead of Feb. 3.

6.  We've also discussed a little bit of the new calculation of forces/pressure on the Solenoid coil without any yoke.   Somehow, the forces
     are not bigger as we have thought, probably due to the fact that the field has decreased from 1.4 T to 1.24766 T .   People are a bit puzzled
     by this and thinking hard to understand this ........