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Prediction of multipactor in the iris region of rf deflecting mode cavities

Research output: Contribution to journalJournal article

Published

???articleNumber???122002
Journal publication date2011
JournalPhysical Review Special Topics: Accelerators and Beams
Journal number12
Volume14
Number of pages11
Original languageEnglish

Abstract

Multipactor is a major cause of field limitation in many superconducting rf cavities. Multipacting is a particular issue for deflecting mode cavities as the typical behavior is not well studied, understood, or parametrized. In this paper an approximate analytical model for the prediction of multipactor in the iris region of deflecting mode cavities is developed. This new but simple model yields a clear explanation on the broad range of rf field levels over which the multipactor can occur. The principle multipactors under investigation here are two-point multipactors associated with cyclotron motion in the cavity’s rf magnetic field. The predictions from the model are compared to numerical simulations and good agreement is obtained. The results are also compared to experimental results previously reported by KEK and are also found in good agreement.