Note: Design and resonant condition measurement of the mushroom-shaped Al test cavity for critical magnetic field evaluation of superconducting thin-film sample

Hiroki Oikawa; Takeshi Higashiguchi; Hitoshi Hayano

doi:10.1063/1.5037295

Note: Design and resonant condition measurement of the mushroom-shaped Al test cavity for critical magnetic field evaluation of superconducting thin-film sample

Rev Sci Instrum. 2018 Jul;89(7):076102. doi: 10.1063/1.5037295.

Authors

Hiroki Oikawa¹, Takeshi Higashiguchi¹, Hitoshi Hayano²

Affiliations

¹ Department of Electrical and Electronic Engineering, Faculty of Engineering, Utsunomiya University, 7-1-2 Yoto, Utsunomiya, Tochigi 321-8585, Japan.
² High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan.

PMID: 30068142
DOI: 10.1063/1.5037295

Abstract

We designed a mushroom-shaped Al test cavity for measurement of the critical magnetic field at a radio frequency microwave with a frequency of 5.2 GHz. The characteristics of the Al test cavity are characterized toward the evaluation of the superconducting multilayer thin films under high-power radio frequency microwaves at cryogenic temperatures by the Nb-based cavity. We evaluated a target resonant frequency, the separations of neighboring modes, and the electromagnetic field distribution of the target mode. The calculated frequency change was in good agreement with that obtained experimentally.