Kinetic theory of high-relativistic electron cyclotron maser with a novel quasi-optical cavity
- Univ. of Electronic Science and Technology of China, Chengdu (China). Institute of High Energy Electronics
- Southwestern Institute of Physics, Chengdu (China)
For the planned experiments on electron cyclotron heating of thermonuclear fusion plasmas, the high efficiency, high power ({ge}1 MV), continuous wave sources operating at frequencies in excess of 100 GHz are needed. The gyrotron (electron, cyclotron maser) has been shown to be a good candidate for such a source. In recent years, the conventional waveguide cavity gyrotrons have made great progress. However, when operating at even shorter wavelength with higher efficiency and higher output power, the serious problems such as high Ohmic heating of cavity, mode competition and beam electrons collection also appear. To circumvent these problems, the quasioptical gyrotron, in which the interaction between the radiation and the injected electron beam takes place in an open, optical resonator, was first proposed in. The use of an open-resonator can effectively eliminate many modes that might otherwise compete with the operating mode, and the quite larger open-resonator can lead the peak power dissipation in the mirrors to be lowered relative to that in a corresponding gyromonotron, so the quasioptical gyrotron has the potentials for overcoming the limitations of the conventional waveguide cavity gyrotron. Here, using the Laplace transformation, the kinetic theory of the high-relativistic electron cyclotron maser having a novel open-resonator -- the axisymmetrical quasioptical cavity of oblique rotation at arbitrary angle (AQCORAA), is carried out within the framework of the linearized Vlasov-Maxwell equations. The beam-wave interaction power, starting current and frequency shift have been derived and numerically calculated. The influence of rotating angle on beam-wave interaction is also studied. A series of important conclusions obtained in this paper reveal the characters of this novel quasioptical electron cyclotron maser.
- OSTI ID:
- 64585
- Journal Information:
- IEEE Transactions on Plasma Science, Vol. 23, Issue 2; Other Information: PBD: Apr 1995
- Country of Publication:
- United States
- Language:
- English
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