Fast Cyclotron Wave Excitation in a Spiral Electron Beam-Plasma System

抄録

The fast cyclotron wave excitation resulting from the coupling with the electron Bernstein wave is observed in a magnetized plasma penetrated by a spiral electron beam. For the excitation to occur, the beam energy component perpendicular to the magnetic field is larger than a critical value. From measurements of the wave number and the growth rate of the excited cyclotron wave, its dispersion relation is determined for various values of beam and plasma parameters. The experimental results are compared with the theoretical considerations.