Surface RF magnetic field enhancement due to closely spaced cylindrical protrusions

The magnetic field enhancement caused by closely spaced, cylindrical, metallic protrusions in an rf cavity is studied theoretically and compared to field solver results for such micro-structures. It is found that the enhancement between the protrusions can be large when the magnetic field is perpend...

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Bibliographic Details
Published in:Applied physics letters 2014-04, Vol.104 (14)
Main Authors: Wang, Faya, Adolphsen, Chris, Nantista, Christopher, Stupakov, Gennady, Xiao, Liling
Format: Article
Language:English
Subjects:
Applied physics
Heat transmission
Holes
Magnetic fields
Magnetism
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Summary:The magnetic field enhancement caused by closely spaced, cylindrical, metallic protrusions in an rf cavity is studied theoretically and compared to field solver results for such micro-structures. It is found that the enhancement between the protrusions can be large when the magnetic field is perpendicular to the gap between them, and that the enhancement increases as this gap is reduced. This mechanism could help explain the observation of melting on normal-conducting cavity surfaces subjected to non-enhanced pulsed heating well below that required to melt the surface material. It could also help explain quenching in superconducting cavities when the nominal magnetic fields are below the critical value.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4870493