Abstract
An experiment in fundamental oscillation mode was conducted using Gyrotron FU CW GVII designed to oscillate in the second harmonic. It was observed that 11 fundamental wave modes oscillated in the frequency range of 115 to 205 GHz. Gaussian beams converted by a mode converter, designed for the co-rotating second harmonic TE <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">65</inf> mode, were emitted from the gyrotron window. It was demonstrated that this gyrotron can output Gaussian beams in a wide frequency range. A Vlasov launcher converts to a Gaussian beam even for the oscillation of a counter-rotating mode.
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