Abstract
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.
Highlights
Experiments with electron beam current in a linear accelerator at KAERI were confronted with the beam breakup instability problem
It is important to investigate why the beam current threshold does not depend on these parameters, and whether there is a similar instability for continuous beams
V analyzes rf focusing by a TE higher-order modes (HOMs) to suppress breakup instability in superconducting LEP cavity, the parameters of a TE HOM and the behavior of the breakup instability threshold current versus the TE021 mode are calculated and presented
Summary
Experiments with electron beam current in a linear accelerator at KAERI were confronted with the beam breakup instability problem. This accelerator has a 2 MeV electron beam injector and two four-cell superconducting LEP cavities (see Fig. 1) operating at 352 MHz. This accelerator has a 2 MeV electron beam injector and two four-cell superconducting LEP cavities (see Fig. 1) operating at 352 MHz Both the LEP cavities and the injector were installed with the help of BINP scientists [1]. It has been found that the threshold current of breakup instability is independent of repetition rate, bunch charge, initial small beam offsets, and slopes [2]. V analyzes rf focusing by a TE HOM to suppress breakup instability in superconducting LEP cavity, the parameters of a TE HOM and the behavior of the breakup instability threshold current versus the TE021 mode are calculated and presented
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