sPHENIX discussion of the superconducting solenoid

[Kin Yip <kinyip AT fnal.gov>]

1.       I understand that for yesterday, we didn't log until Carl called Winston towards the end or something ...

In the attached plot, yesterday's is on the left which is on the log folder of 60 Hz Data by mistake (Winston told me);
whereas today's is on the right hand side on the log folder of 120 Hz Data.  

Yesterday, somehow the Mag_Current seemed to be the current that we want but PS_Current seemed to be wrong.   Today, those
two  track each other closely.    ( It must be artificial ... as there shouldn't be real Mag_Current. )

At the peak, I saw 3917 A (yesterday) or 3914.2 (today).   Carl told me that Winston's scale factor is slightly wrong and it should be corrected
by 6/5   =>  3917*6/5 ~ 4700 A :-)

 

 

2.      I also attach the latest Cryo situation (HMI Display).   The temperatures for the magnet is ~220 K.  The dropping slope seems to be 0.5 K/hour.

3.      Due to short-circuit tests for parts of the days, Paul Giannotti/Frank Toldo and today Peter Zimmerman haven’t been able to finished the connections.
There won’t be any interruption tomorrow as Pablo won’t be here.

4.      I also make an appointment with Mike Lenz at 8:30 am to let him disconnect the temporary cover, connect the MCM cables so that he can take
measurements, and then put back the temporary cover.   {  We have to do hipot after cool-down is complete and for that the MCM cable can’t be

connected to Magnet.

 

 

Kin

Attachment: Currents.jpeg
Description: Currents.jpeg

Attachment: 2017-12-21 Cool-down.jpg
Description: 2017-12-21 Cool-down.jpg