M. Yu. Demchenko

Method of resonant matching in diffraction radiation oscillator with a double comb

The resonant matching instead of the traditional phase matching of the double periodic grating substantially changes the resonant oscillation field structure in the ORS as DRO part. On the other hand, the double periodic grating at the bottom of the rectangular groove acting as a quarter-wave transformer enhances the resonance field utilization by the electron beam and effectively removes high-order modes, enabling us to further advance to the terahertz region. When the matching groove height is chosen to be b = 0.75λ , quite a wide tuning range is possible to achieve for the working oscillation with a high radiation quality. A larger factor of resonance field utilization in the ORS is due to the resonance field contraction to the ORS axis in the mirror space rather than the field amplitude growth in the double periodic structure, and it will not increase the ORS ohmic loss.

The experimental investigations of dro-orbictron in 8-MM waveband

The experimental researches of DRO-orbictron mainly confirmed the conclusions of theoretical researches and showed perspective of the use in DRO resonance matching method of double grating with the ORS-field. The placing of double grating on the bottom of the matching groove gives the opportunity in substantially decreasing of ORS-mirrors aperture, and we can excite in the ORS only the basic TEM00q-modes. The increasing of efficiency for energy exchange between an electron beam and resonance field in DRO-orbictron is caused by gathering of the resonance field to the width of matching groove and do not accompanied by the growth of ohmic losses in a resonator. At the choice of the matching groove height to b ≈ 0,75λ the width of one-mode frequency tuning for DRO-orbictron exceeds 5,5%, and the output power arrives P = 10Watt at the beam current Ia = 130mA and the accelerating voltage Ua = 2,9 kV. The carried-out experimental researches of DRO-orbictron showed a perspective of use the given ORS in short-wavelengths DRO.

Klinotron effect in Diffraction Radiation Oscillator

The analysis of experimental data has shown that, the klinotron effects in DROs (diffraction radiation oscillator) always are associated. It can have a very significant effect on the output power of the DRO. The klinotron effects always have a negative or a positive impact on the strength of the beam interaction with a high-frequency field. The use of deflecting electrodes or disperse bevels for entering the electron beam in the interaction space of DRO allows to reduce starting current and magnetic focusing field, increase output power and efficiency of DRO.

Packaged DRG of continuous oscillations of increased power of frequency range 30–100 GHz

The output characteristics of breadboard models of diffraction radiation generators with a chain of coupled resonators DRG (CCR) of the frequency range 30-100 GHz with output power more than 20W and accelerating voltage up to 3.6 kV in the continuous mode with satisfactory quality of a signal spectrum are presented.