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- W2080967557 abstract "ABSTRACT Results from a quasi-optical gyrotron experiment with a 20 28 cm mirror separation will be presented showing operation from 95 130 GHz at powers up to 150 kW and efficiencies up to 11%. The output coupling can be controlled by varying the mirror separation. Efficiency optimization by variation of output coupling and by tapering the magnetic field has been demonstrated. INTRODUCTION The quasi-optical gyrotron (QOG) has been under devel opment as a megawatt average power source of 100-300 GHz radiation for ECRH of fusion plasmas.1 3 It differs from con ventional gyrotrons by having an open resonator formed by a pair of spherical mirrors instead of a waveguide cavity. The QOG operates in one or more of the TEM0on gaussian modes of the resonator. To obtain low mirror ohmic losses consis tent with CW operation at millimeter wavelengths, the axial mode index n must be large (> 100) and the relative mode separation must be small compared to the interaction band width. This leads to the possibility of several interacting axial modes with attendant mode competition. This paper presents results from an experimental study of this operating regime. The separation of the resonator mirrors is adjustable which al lows independent variation of the resonator output coupling. The QOG has operated from 95 130 GHz at powers up to 150 kW and efficiencies up to 11%. Efficiency optimization by variation of output coupling and by tapering the magnetic field has been demonstrated. Operation in single and multi- mode steady-states has been observed. These results point the way to the realization of megawatt level devices." @default.
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- W2080967557 date "1988-11-18" @default.
- W2080967557 modified "2023-09-27" @default.
- W2080967557 title "Operation Of A Quasi-Optical Gyrotron With Variable Output Coupling" @default.
- W2080967557 doi "https://doi.org/10.1117/12.978444" @default.
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