Residual surface losses in thin film coated RF superconducting cavities

Author

Attanasio, C. ; Maritato, L. ; Vaglio, R.

Author_Institution

Dipartimento di Fisica, Salerno Univ., Italy

Volume

27

Issue

2

fYear

1991

fDate

3/1/1991 12:00:00 AM

Firstpage

1920

Lastpage

1923

Abstract

Residual losses are known to be one of the main factors limiting the performance of RF superconducting cavities for particle accelerators. In particular, in thin-film sputter-coated cavities, residual terms that are strongly dependent on the RF field amplitude have been observed in the surface resistance. It is shown that RF losses at the grain boundaries can be one of the main sources of the residual surface resistivity in Nb and Nb-alloy thin-film-coated RF cavities. The effect of the film thickness on the surface impedance is also discussed

Keywords

beam handling equipment; cavity resonators; linear accelerators; losses; particle accelerator accessories; superconducting devices; Nb films; RF field amplitude; RF superconducting cavities; film thickness; grain boundaries; particle accelerators; residual surface losses; residual surface resistivity; sputter-coated cavities; surface impedance; surface resistance; thin film coated; Conductivity; Grain boundaries; Linear particle accelerator; Niobium; Performance loss; Radio frequency; Sputtering; Superconducting thin films; Surface impedance; Surface resistance;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.133577

Filename

133577