Document Type

Article

Publication Date

1-2018

DOI

10.1103/PhysRevAccelBeams.21.012002

Publication Title

Physical Review Accelerators and Beams

Volume

21

Issue

1

Pages

012002 (7 pp.)

Abstract

A strong degradation of the unloaded quality factor with field, called high field Q slope, is commonly observed above Bp ≅ 100 mT in elliptical superconducting niobium cavities at 1.3 and 1.5 GHz. In the present experiments several 3 GHz niobium cavities were measured up to and above Bp ≅ 100 mT. The measurements show that a high field Q slope phenomenon limits the field reach at this frequency, that the high field Q slope onset field depends weakly on the frequency, and that the high field Q slope can be removed by the typical empirical solution of electropolishing followed by heating to 120°C for 48 hrs. In addition, one of the cavities reached a quench field of 174 mTand its field dependence of the quality factor was compared against global heating predicted by a thermal feedback model.

Comments

Pubblished by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.

Original Publication Citation

Ciovati, G., Eremeev, G., & Hannon, F. (2018). High field Q slope and the effect of low-temperature baking at 3 Ghz. Physical Review Accelerators and Beams, 21(1), 012002. doi:10.1103/PhysRevAccelBeams.21.012002

ORCID

0000-0001-9316-7704 (Ciovati)

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