Development of the Multifrequency Gyrotron FU CW GV with Gaussian Beam Output
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Gyrotron FU CW GV has been developed as a multifrequency gyrotron for operation over the frequency range from 162 to 265 GHz at frequencies separated by steps of approximately 10 GHz. The oscillation modes were selected; the radii of the caustic surfaces for the electromagnetic waves of the modes had similar values in the waveguide, and it was therefore expected that these modes would be converted into Gaussian beams by a mode converter. In reality, more than ten modes oscillated and the Gaussian-like beams were radiated. A double-disk window with variable spacing maintains the transmittance through the window at a high level over a wide range of frequencies. Using this window, output powers of more than 1 kW were observed for almost all the expected modes.
KeywordsGyrotron Multifrequency operation Gaussian beam Mode converter Double-disk window High-power radiation source
This work was partly supported by a special fund for research projects from the Ministry of Education, Culture, Sports, Science and Technology of Japan and by JSPS KAKENHI Grant Number 25420327.
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