Study of Magnetic Shielding Materials and Fabrication of Magnetic Shield for Superconducting Cavities

Author

Masuzawa, M. ; Tsuchiya, K. ; Terashima, Akio

Author_Institution

High Energy Accel. Res. Organ., Tsukuba, Japan

Volume

24

Issue

3

fYear

2014

fDate

Jun-14

Firstpage

1

Lastpage

4

Abstract

Magnetic properties of Cryophy were measured at room and cryogenic temperatures using ring samples. Sample-to-sample variation in permeability was evaluated in addition to measurement error. Permeability dependence on the maximum annealing temperature was examined using ring samples annealed at 1100 °C and 1170 °C. From these data, Cryophy was chosen as magnetic shielding material for the superconducting cavities in the main linac section of the cERL (compact Energy Recovery Linac) at KEK. Magnetic properties of Cryophy are presented along with the results of simulation based on the data obtained. The result of the high-power test of the cERL main linac cavities is reported at the end.

Keywords

annealing; cryogenics; linear accelerators; magnetic shielding; superconducting cavity resonators; Cryophy; KEK cERL main linac section; compact Energy Recovery Linac; magnetic shielding materials; maximum annealing temperature; permeability; sample-to-sample variation; superconducting cavities; temperature 1100 degC; temperature 1170 degC; Annealing; Cavity resonators; Helium; Magnetic fields; Magnetic shielding; Permeability; Temperature measurement; Cryogenic temperature; magnetic shield; permeability; superconducting cavity;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/TASC.2013.2284922

Filename

6626674