300GHz高出力ジャイロトロンにおけるラミナー電子ビームの形成 (平成23年度福井大学遠赤外領域開発研究センター研究成果報告書)

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This report describes the design of a magnetron-injection gun，which is intended for use 100 kW，30 0 GHz gyrotron. With increases in power and frequency，performance of the gyrotron becomes quite sensitive to the quality of the electron beam. Formation of a laminar electron flow isessential for the realization of a high qua1ity beam with small velocity spread .In th is study，a newmethod is developed for the evaluation of the laminarity，and applied to the design optimization ofthe electrodes. It is found that the laminarity depends not on1y on the conventional design parameterof the cathode slant angle，but also on the spatial distribution of the electric field inside the beam. Ina well laminated beam， it is revealed that the pitch factor of each electon trajectory is modified toadjust the spatial separation between the neighboring trajectories around the cathode and first anode.An electron gun which is suitable for the new gyrotron has been successfully designed. In the future，we plan to clarify the relation between the laminarity and the profile of the electric field inside the electron beam.
福井大学遠赤外領域開発研究センターの論文