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An improved suppression method of the transverse-electromagnetic mode leakage with two reflectors in the triaxial klystron amplifier

2014; American Institute of Physics; Volume: 21; Issue: 7 Linguagem: Inglês

10.1063/1.4889901

1527-2419

Zumin Qi, Jun Zhang, Huihuang Zhong, Qiang Zhang, Danni Zhu,

Particle accelerators and beam dynamics

Suppression of the transverse-electromagnetic (TEM) mode leakage is crucial in the design of a triaxial klystron amplifier with high gain, because a small microwave leakage from the buncher or the output cavity could overwhelm the input signal with low power. In this paper, a specially designed reflector is proposed to suppress the TEM mode leakage, whose axial electric field is approximately zero at the beam radial position. Theoretical analysis indicates that the reflector introduces little influence on the normal modulation of the beam while keeping a high reflection coefficient. By using two such reflectors with different eigen frequencies located in front of the buncher cavity and the output cavity, respectively, an improved triaxial klystron amplifier is presented. The simulation results show that the reflectors substantially decrease the TEM mode leakage power and achieve very good isolation among the cavities. The improved triaxial klystron amplifier can operate normally with 10's kW microwave injection without self-oscillations.