[BTeam] Follow-up Re: More data on LCW Temperature variations

[Jay Benesch]

https://logbooks.jlab.org/entry/4041098
Submitted by okumar on Tue, 09/13/2022 - 15:56.

We did more investigation on this issue, so far we are able to verify 
that ARC7, ARC9 and RSEP9 shunts voltage fluctuation do coincide with 
the beam position change. Plotting all the respect shunt currents with 
respect to shunt voltage, LCW temperature & beam positions shows no 
shunt current variations (see attached waveforms). Investigation on this 
problem will continue tomorrow.

three figures.

Let's hope the heat exchanger swap tomorrow solves the problem. 
https://tasklists.jlab.org/atlis/tasks/107471

The coils are not well coupled to the steel, but steel may see some 
modest temperature, and therefore thermal expansion/contraction.  Pole 
length will clearly change.  Whether pole spacing will change enough to 
compensate is beyond my powers of visualization.