Measurements of SCRF Cavity Dynamic Heat Load in Horizontal Test Sysytem

Abstract

The Horizontal Test System (HTS) at Fermilab is currently testing fully assembled, dressed superconducting radio frequency (SCRF) cavities. These cavities are cooled in a bath of superfluid helium at 1.8K. Dissipated RF power from the cavities is a dynamic heat load on the cryogenic system. The magnitude of heat flux from these cavities into the helium is also an important variable for understanding cavity performance. Methods and hardware used to measure this dynamic heat load are presented. Results are presented from several cavity tests and testing accuracy is discussed.

Development of a low-pressure helium compression control system strategy

“…Данная тепловая нагрузка на криогенную систему значительно превышает тепловую нагрузку вследствие теплопроводности и излучения. [2] В связи с этим, одним из наиболее важных требований к криогенной системе является высокая эффективность ее работы в широком диапазоне тепловых нагрузок. С точки зрения возможностей обеспечения данного требования проведен анализ циклов холодного и гибридного сжатия.…”

SRF cavity testing status and operating experience

“…The superfluid bath pressure is controlled to +/-13 Pa. An important cryogenic part of SRF cavity testing is to conduct dynamic heat load measurements. This is a routine part of cavity testing, and has been previously described [6].…”