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Title SURFACE SMOOTHNESS FOR HIGH GRADIENT NIOBIUM SC RF CAVITIES
Type Poster materials / surface effects
Abstract The author analysed the Q-slope in the Qo-Eacc excitation cures of niobium RF cavities in other paper using two models: global heating and magnetic gap smearing model. The latter can derive the effective thermo-dynamical magnetic critical field (Hc) of the niobium material used for the cavity. The effective magnetic field looks to be smaller than the ideal that in chemically polished cavities. It might be due to the field enhancement effect. In this paper, supposing this consideration, the relationship between the high gradient and the field enhancement factor will be obtained experimentally. The needed surface roughness will be less than 2 micron in Rz for the high gradient Eacc > 30MV/m.

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Principle author first.

Last (Family) Name First Name (Initials only) Affiliation or Organization (abbreviations if possible)
Saito K KEK



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