Abstract

The effects of beam-loading on the RF field in the cavity and on the beam capture to the electron synchrotron from the injector linac have been studied experimentally and theoretically. In the present experiment, the amplitude and the phase of the RF field, which is a superposition of the external driving field and the beam-induced field, have been found to change during the transient period just after the injection from the linac. This phenomenon is striking, especially when the frequency of the external driving field is very different from the resonant frequency of the cavity. In this detuning of the cavity, a large capture efficiency of the injected beam from the linac has been observed. The mechanism of this has been elucidated by analyzing the effects of the beam-induced field in the cavity during the transient period.

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