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The effective cavity length of megawatt-class gyrotrons for thermonuclear fusion plasma heating with cavity quality factors in the range of 1000 to 2000 cannot be deduced just from the cavity field profile, since this has by far not a Gaussian contour. This report presents a novel method to determine the effective length of a high-power gyrotron cavity from the eigenvalue of the operating mode, the...
Gyrotron FU CW GV has been developed as a multiple-frequency gyrotron. The main mode is TE10, 6 and corresponding frequency is 265 GHz. More than ten modes oscillated and Gaussian beams were radiated for these modes. A double-disk window was adopted to maintain the transmittance through the window in high level for a wide range of frequency.
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