A high power complex cavity gyrotron for fusion research devices

Abstract
[[abstract]]Gyrotron oscillations are of great interest as sources of high power MM wave radiation for electron cyclotron resonance heating and current drive in magnetic fusion research devices. However, as gyrotron power approaches the megawatt level, a very large, overmoded cavity must be employed in order to keep ohmic power losses in the cavity at an acceptable level, and the problem of mode overpopulation becomes severe. The authors describe a novel approach for solving the problem by using a multiple or complex cavity configuration. Prebunching is achieved in the first cavity while energy extraction takes place in the second. Experimental and theoretical studies for efficiency enhancement and mode competition reduction are presented for a 35 GHz, 350 kW gyrotron oscillator operating with a TE01/TE04 cavity[[fileno]]2010126030001[[department]]物理

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