Cryogenic RF Material Testing with a High-Q Copper Cavity

An X‐band RF cryogenic material testing system has been developed in the past few years. This system employs a high‐Q copper cavity with an interchangeable flat bottom working under a TE013 like mode. By measuring the cavity Qs with a network analyzer, the system can characterize the surface resistance of different samples at different temperatures. Using a 50 MW 2μs pulsed klystron, the system can measure the quenching H field for superconducting samples, up to 300–400 mT. In this paper, we will present the most recent developments of the system and testing results.