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Sub-THz radiation can be generated by conversion of plasma waves into electromagnetic (EM) radiation at strong Langmuir (LT) turbulence via a two-stream instability induced by a high current relativistic electron beam (REB). Nonlinear plasmon-plasmon merging results in the generation of photons nearby the 2nd harmonic of the plasma frequency 2p ("2p-process"). For plasma densities

10141015 _cm-3_{, these frequencies are in the range of sub-mm waves: 370-570 GHz.}

The power density of sub-mm-wave emission from plasmas in the multi-mirror trap GOL-3 (BINP) during injection of a 10-s-REB at plasma densities ne  5·1014 cm-3,

between 5 – 10 kW/cm3 in the frequency band above 100 GHz.

Experiments on the ELMI device (BINP) demonstrated the operation of two parallel mm-wave single-channel free electron masers (FEMs) with planar cavity geometry and 2D distributed feedback. Measurements have shown single-mode single-frequency generation (75 GHz) with about 300 ns pulse duration at the power level of 20-40 MW from each of the two FEM channels. Now we plan to investigate an inter-cavity scattering scheme for two-stage generation of sub-mm wave radiation. Both the GOL-3 and FEM experiments need spectral diagnostics of sub-THz radiation. Novel micro-structured quasi-optical elements have been developed where amplitude, phase and polarization responses are controlled by frequency selective surfaces (FSSs) manufactured by photolithography and electroforming. Bandpass filters (70 mm aperture diameter) with center frequency (CF) from 112 to 376 GHz show > 90% transmission and have a FWHM bandwidth of ~ 12% and an out-of-band attenuation of higher than 40 dB.

the ECRH system being under construction at the GDT magnetic mirror device at BINP can provide essential enhancement of the electron temperature in the central cell up to 400 eV. At such temperatures a GDT like neutron source is quite attractive in comparison to accelerator based systems. Ray-tracing calculations show that for launching angles 50o – 55o the oblique launch of ECRH waves results in generation of right-hand-polarized electromagnetic waves propagating with high N|| in the vicinity of the cyclotron resonance layer. This leads to effective single-pass absorption of the injected microwave power. The ECRH system being installed at GDT consists of two 54.5 GHz, 400 kW gyrotron modules (GYCOM: Buran-A type) equipped with a matching optical unit (MOU) to prepare a Gaussian microwave beam with parameters suitable for transmission through a corrugated HE11 waveguide (inner 63.5 mm) employing three 90 miter bend units. One of these miter bends is combined with a universal polariser to provide a microwave beam. The start-up of the first transmission line is expected in May 2012.

Microwave processing was very successfully applied to: (1) Heating of intercalation compounds of fluorinated graphite; (2) Development of new microwave-assisted techniques for synthesis of volatile beta-diketonates of platinum-group metals; (3) Microwave assisted extraction of biologically active substances from medicinal plant material; (4) Investigation of the microwave assisted synthesis leading to phthalimides of amino acids under solvent-free conditions, and (5) Investigation of microwave assisted synthesis of heterocycles for pharmacy.

Acknowledgements: The authors thank their colleagues from the Institute of Applied

Physics, RAS, in Nizhny Novgorod for their great contributions to the work presented here: N.S. Ginzburg, E.D. Gospodchikov, V.I. Malygin, N.Yu. Peskov, A.S. Sergeev, A. G. Shalashov, O. B. Smolyakova, and V.Yu. Zaslavsky. We also acknowledge A.V. Gelfand, Dr. M. A. Dem'yanenko and M.A. Astafyev for technological support in

manufacturing FSS structures and in THz measurements. Herewith we gratefully acknowledge the support of this research by the Russian Federation (RF) Government Grants #11.G34.31.0033 and #NSh7792.2010.2, by the Contract #16.740.11.03.77 of the Ministry Education and Science of the RF, by the contract 16.740.11.0377 of the Federal Target Program, and by the Program 30 of RAS.

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