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The first experimental demonstration of the physical mechanism underlying multi-electron-beam Cherenkov free-electron lasers has been carried out. Electron beams of a total beam current of 280 A at 500 kV were introduced into a multi-dielectric cavity and stimulated Cherenkov radiation of 1.7 MW at 33.4 GHz was generated. The interaction efficiency was about 1.2%.

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The dispersion characteristics of the dominant mode in the suspended slotlines on magnetized ferrite and anisotropic dielectric substrates have been obtained. The solution is obtained by applying the transverse equivalent transmission line in the spectral domain and the Galerkin method. Numerical results are presented which could be used in designing directional couplers and isolators.

The dispersion relations of dielectric-lined double-slab waveguides used in Cerenkov free-electron lasers are derived and the existence of a group of odd modes, which can be simultaneously excited with the previously considered even modes, is reported. A discussion on the dependence of the radiation frequency and single-pass gain on the system parameters, the dielectric thickness, the beam energy and the beam channel width, is presented. The effects of the odd modes on the Cerenkov free-electron laser operation are investigated.