Kinetic stability analysis of the extraordinary mode perturbations in a cylindrical magnetron

Han Sup Uhm; H. C. Chen; Robert A. Stark

doi:10.1117/12.43487

1 April 1991 Kinetic stability analysis of the extraordinary mode perturbations in a cylindrical magnetron

Han Sup Uhm, H. C. Chen, Robert A. Stark

Proceedings Volume 1407, Intense Microwave and Particle Beams II; (1991) https://doi.org/10.1117/12.43487
Event: Optics, Electro-Optics, and Laser Applications in Science and Engineering, 1991, Los Angeles, CA, United States

Abstract

Stability properties of the extraordinary mode perturbations in a relativistic electron flow in a cylindrical magnetron are investigated within the framework of the linearized Vlasov-Maxwell equations. The stability analysis is carried out under the assumptions that the layer is thin and relatively tenuous and that the phase velocity of the perturbed waves is very close to the mean drift velocity of the layer. The perturbed distribution function is calculated by integrating along the electron orbit. The eigenvalue equation is derived and solved in the vacuum and layer regions. Solution in the vacuum region includes the resonator influence and cylindrical curvature effects. A closed algebraic dispersion relation is obtained for the synchronous modes. Analytical investigation of the dispersion relation is carried out for the resonance modes, which are very close to the vacuum modes in the magnetron circuit. The necessary and sufficient condition for instability is obtained for the resonance modes. It is shown that typical growth rates of the instability are few percents of the electron cyclotron frequency.

Citation Download Citation

Han Sup Uhm, H. C. Chen, and Robert A. Stark "Kinetic stability analysis of the extraordinary mode perturbations in a cylindrical magnetron", Proc. SPIE 1407, Intense Microwave and Particle Beams II, (1 April 1991); https://doi.org/10.1117/12.43487

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