sPHENIX discussion of the superconducting solenoid

["Yip, Kin" <kinyip AT bnl.gov>]

Hello,

 

So, the first two events that brought down the Magnet came with a strange thing: the quench detector didn’t tell us what voltage tap

caused it but just said “Program Stopped” and left us no “file” in the PIXe system ☹  ( The last one yesterday did tell us which

voltage tap caused the trip and left us a file. )

 

Today, we have asked Chung Ho to essentially remove the “PLL Loss” check which we have long suspected doing bad things to the

quench program (Labview) as it stopped the program at times that we don’t understand.   Carl has long wanted to remove

this “PLL Loss” check which he thinks is unnecessary as he used the same PLL board in RHIC and they don’t have a problem there.

( This “PLL Loss” check was insisted by the previous author who has left BNL; but Carl thinks that the way it checks was error-prone. )

 

It’s possible we might have 2/3 of the problems 😊

 

Kin