sPHENIX discussion of the superconducting solenoid

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

Hello,

 

Since we turned on the magnet last Wed. (May 31) after 5 pm, the Magnet has tripped 3 times,

last Friday (11:54), last night at 23:05 and this morning 9:25.

 

Last night seems to be related to a blown fuse in the capacitor bank in the power supply.  But the

other two was due to quench-detector doing its job (that when voltage taps pass the threshold,

it’ll pull the quench link and generate fast discharge). 

 

Some of us are thinking that the only explanation is due to the radiation from the beam …

 

Not sure what we can.   Anybody with any ideas, please let me know.

 

I’m just ramping up the magnet again and it’s almost there.

We’ll power down the magnet tomorrow at 5 am for the maintenance work to fix TPC leaks etc.

 

Kin