sPHENIX discussion of the superconducting solenoid

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

Hi,

Just to jot down a note or two in this Sunday morning in sPHENIX Control Room 😁

1. Sat. (yesterday) morning, I amped the magnet current from 0 (setpoint) to 4620.3 A (setpoint) --- should give 4596 A --- from ~8:54 am to ~9:41 am, about 1 hour 47 minutes.
   
   
2. The CERN team started the 10-hour scan at 9:47 am.  
   
   
3. The mapping stopped for 1 hour or more.  From Nicola Pacifico, the trolley (which moves the mapper) is a bit like a Van der Graaf Generator and too much charge caused a spike --- detected by their limit switch sensor --- and this caused the trolley to stop (his design). They then properly ground their trolley to avoid charge accumulation :-)
4. From the output file of the CERN raspberrypi computer (outputFile10hrsScanAllProbes.txt), the so-called 10-hour scan ended at about 10:11 pm last night. 
   

Then, the so-called 40-hour scan started at 11:13 pm last night.

Kin