Journal
IEEE TRANSACTIONS ON ELECTRON DEVICES
Volume 62, Issue 9, Pages 3049-3055Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TED.2015.2455023
Keywords
Frequency tuning; gyrotrons; space charge; thermal expansion
Funding
- European Communities
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A detailed investigation of the RF oscillation frequency produced by megawatt-class continuous wave 140 GHz gyrotrons for the stellarator W7-X found discrete jumps of a few megahertz during the initial frequency downtuning phase, as well as in quasi-steady long-pulse operation. The common explanations for such behavior, such as voltage ripple and the classical long-line effect, are reviewed, and are found not to match the experimental observations properly. As alternative hypotheses, we suggest a long-line effect involving higher-order reflections inside the gyrotron, or discrete changes in the cavity radius, caused by discontinuous thermomechanical expansion.
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