Commissioning report of the MuCool 5 Tesla solenoid coupled with helium refrigerator

Geynisman, Michael

Fermi National Accelerator Laboratory

关键词: Solenoids Accelerators;    43 Particle Accelerators;    Refrigerators;    Interlocks;    Compressors;   

DOI  :  10.2172/982853
RP-ID  :  FERMILAB-TM-2462-AD
RP-ID  :  AC02-07CH11359
RP-ID  :  982853

美国|英语

来源: UNT Digital Library

【 摘 要 】

MuCool 5T solenoid was successfully cooled down and operated coupled with MTA 'Brown' refrigerator. The system performed as designed with substantial performance margin. All process alarms and interlocks, as well as ODH and fire alarms, were active and performed as designed. The cooldown of the refrigerator started from warm conditions and took 44 hours to accumulate liquid helium level and solenoid temperature below 5K. Average liquid nitrogen consumption for the refrigerator precool and solenoid shield was measured as 20 gal/hr (including boil-off). Helium losses were small (below 30 scfh). The system was stable and with sufficient margin of performance and ran stably without wet expansion engine. Quench response demonstrated proper operation of the relieving devices and pointed to necessity of improving tightness of the relieving manifolds. Boil-off test demonstrated average heat load of 3 Watts for the unpowered solenoid. The solenoid can stay up to 48 hours cold and minimally filled if the nitrogen shield is maintained. A list of improvements includes commencing into operations the second helium compressor and completion of improvements and tune-ups for system efficiency.