Influences of electron beam on resonant frequency and electromagnetic field distribution of TM modes in a cavity

Lin Fumin; Zhang Huafu; Ma Xiaolan

doi:10.3788/HPLPB20132507.1763

Volume 25 Issue 07

May 2013

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Article Navigation > High Power Laser and Particle Beams > 2013 > 25(07): 1763-1769

Zhang Ying, Pang Beibei, Xi Zhiguo, et al. Design of a in-situ stress loading system used for residual stress neutron diffractometer[J]. High Power Laser and Particle Beams, 2013, 25: 2865-2868. doi: 10.3788/HPLPB20132511.2865

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Lin Fumin, Zhang Huafu, Ma Xiaolan. Influences of electron beam on resonant frequency and electromagnetic field distribution of TM modes in a cavity[J]. High Power Laser and Particle Beams, 2013, 25: 1763-1769. doi: 10.3788/HPLPB20132507.1763

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Influences of electron beam on resonant frequency and electromagnetic field distribution of TM modes in a cavity

doi: 10.3788/HPLPB20132507.1763

1.
School of Physics and Optoelectronic Engineering,Guangdong University of Technology,Guangzhou 510006,China;
2.
Department of Physics,Jinan University,Guangzhou 510632,China

Received Date: 2012-12-11
Rev Recd Date: 2013-01-26
Publish Date: 2013-05-02

Abstract

Abstract

An electron beam was regarded as a plasma column, and the eigen frequency equations of the TM0m0 mode of a cylindrical cavity filled with a plasma column in the center are deduced based on the analytic method in this paper. It is studied in detail that the resonant frequency and the electromagnetic field distribution of the TM010 mode and the TM020 mode changes with the plasma frequency of the electron beam. The research results show that the resonant frequency of the TM010 mode and the TM020 mode will increase with the increasing of the plasma frequency of the electron beam, and the distribution of the electromagnetic fields also changes. When the electron beams plasma frequency exceeds the resonant frequency of the cavity, the electromagnetic field distribution of the TM010 mode and the TM020 mode in the cylindrical cavity will change greatly, and some peculiar phenomena will appear, such as the electric field inside the electron beam will be in the opposite direction of the electric field outside the electron beam, the electromagnetic field will be converged on the brim of the electron beam, and so on.
- resonant cavity,
- electron beam,
- plasma,
- plasma frequency,
- resonant mode

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