sPHENIX discussion of the superconducting solenoid

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

Hi,

 

Not sure what kind of fun --- which I’ve learnt over the years to define it for myself, rather than by others ---

people have in the X’mas morning, I have opened the laptop to check the cool-down temperature.   I attach the

HMI graphics as usual.  The “MAGNET COILS” portion seems to fall below 180 K whereas the “MAGNET

HEAT SHIELD” portion seem to be above 180 K, ~10 K above.    The cool-down rate seems to below 0.5 K per hour

especially for the “MAGNET HEAT SHIELD” portion.    I wonder whether it’ll be cold enough tomorrow for the Cryo

group to switch to the 5K helium from plant to cool.

 

I’m also wishing --- again I wish what I myself wish for --- that there will be somebody around tomorrow to finish the

strain-gauge/linear-pot connections …. J

 

Kin

Attachment: 2017-12-25.jpg
Description: 2017-12-25.jpg