First high gradient test results of a dressed 325 MHz superconducting single spoke resonator at Fermilab

Abstract

A new superconducting RF cavity test facility has been commissioned at Fermilab in conjunction with first tests of a 325 MHz, β = 0.22 superconducting single-spoke cavity dressed with a helium jacket and prototype tuner. The facility is described and results of full gradient, CW cavity tests with a high Qext drive coupler are reported. Sensitivities to Q disease and externally applied magnetic fields were investigated. Results are compared to bare cavity results obtained prior to hydrogen degassing and welding into the helium jacket.

arXiv comment3 pp. 25th International Linear Accelerator Conference (LINAC10) 12-17 Sep 2010: Tsukuba, Japan