Interaction of Axially Streaming Electron Beam with Axisymmetric TM Mode in a Periodical Slow Wave Structure with Finite Magnetic Field.

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  • Ogura Kazuo
    Graduate School of Science and Technology, Niigata University, Niigata 950–2181
  • Azegami Takaji
    Graduate School of Science and Technology, Niigata University, Niigata 950–2181
  • Watanabe Osamu
    Graduate School of Science and Technology, Niigata University, Niigata 950–2181
  • Watanabe Tsuguhiro
    National Institute for Fusion Science, Toki 509–5292

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  • Interaction of Axially Streaming Electr

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Interaction between an axially streaming electron beam and an axisymmetric TM mode in a periodically corrugated waveguide is analyzed using a linear fluid model. Effect of the perpendicular perturbation of the beam by a finite magnetic field is considered. There are two mechanisms of Cherenkov interaction between a beam and a TM mode. One is the conventional mechanism attributed to a longitudinal perturbation. The other is attributed to the vertical perturbation of the beam surface and is dominant in the low magnetic field region. The slow cyclotron mode on an axially streaming beam is able to interact with an axisymmetric TM mode only if beam surface modulation is taken into account. The Cherenkov and cyclotron interactions degenerate for zero magnetic fields. This interaction has higher growth rate compared to the conventional Cherenkov interaction in the region of high current and weakly relativistic energy.

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