Measurements of SCRF cavity dynamic heat load in horizontal test system

TL;DR

This paper presents methods and hardware for measuring the dynamic heat load of superconducting RF cavities in a horizontal test system, providing insights into cavity performance and cryogenic system demands.

Contribution

It introduces measurement techniques and hardware for accurately assessing the dynamic heat load of SCRF cavities during testing.

Findings

Measurement methods successfully quantify heat flux from cavities.

Results inform cryogenic system design and cavity performance analysis.

Testing accuracy and reliability are discussed.

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.