The nonlinear theory describing the interaction processes in traveling-wave-amplifier (TWT) and backward-wave-oscillator (BWO) configurations of pasotrons is developed. It is shown that space charge forces in electron bunches formed in the process of beam-wave interaction in the pasotron play a role completely different from that in linear-beam devices with a strong magnetic focusing of electron beams. While in the latter devices the space charge forces limit the device efficiency due to saturation of the axial bunching, in the pasotron they do not destroy electron bunches but cause the radial expansion of them, which may increase device efficiency. The role of these forces is compared with the ion focusing and the radial electric field of the wave, and it is shown that, under certain conditions, it may dominate. The efficiency of the pasotron-TWT with a phase-mixed beam well focused at the entrance may exceed 50%. In the pasotron-BWO, the efficiency is lower (up to 26% in the case studied), but it can grow as the equivalent of the Pierce gain parameter increases.
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February 2006
Research Article|
February 10 2006
Nonlinear theory of beam-wave interaction in the pasotron with a phase-mixed electron beam
Yu. P. Bliokh;
Yu. P. Bliokh
Technion
, Haifa, 32000, Israel
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G. S. Nusinovich
G. S. Nusinovich
a)
Institute for Research in Electronics and Applied Physics,
University of Maryland
, College Park, Maryland, 20742-3511
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a)
Author to whom correspondence should be addressed. Electronic mail: [email protected]
Phys. Plasmas 13, 023102 (2006)
Article history
Received:
January 04 2006
Accepted:
January 18 2006
Citation
Yu. P. Bliokh, G. S. Nusinovich; Nonlinear theory of beam-wave interaction in the pasotron with a phase-mixed electron beam. Phys. Plasmas 1 February 2006; 13 (2): 023102. https://doi.org/10.1063/1.2172924
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