Phys. Rev. ST Accel. Beams 12, 011301 (2009) [9 pages]Prediction and suppression of beam breakup instability in multicell superconducting cavities
Beam breakup instability in superconducting cavities is a serious problem. In this work, a four-cell LEP cavity installed in the KAERI linear accelerator is considered as an example. Dependence of the breakup instability threshold currents on the characteristics of a dipole mode was determined both analytically and numerically. An efficient technique to suppress breakup instability using rf beam focusing within a cavity is suggested. The technique involves applying TE-type monopole higher-order modes and is useful for multicell superconducting cavities with many trapped high-Q dipole modes. This article is available under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. © 2009 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevSTAB.12.011301
DOI:
10.1103/PhysRevSTAB.12.011301
PACS:
29.27.Bd, 41.85.Ja, 85.25.−j, 29.20.Ej
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