Development of Frequency Tunable, Submillimeter Wave Gyrotrons and Their Application to Scattering Measurement of Plasma

频率可调谐亚毫米波回旋管的研制及其在等离子体散射测量中的应用

• 批准号: 01880001
• 负责人: IDEHARA Toshitake
• 金额: $ 11.2万
• 依托单位: Fukui University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Developmental Scientific Research
• 财政年份: 1989
• 资助国家: 日本
• 起止时间: 1989 至 1991
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-01880001/
• 关键词: Gyrotron; Submillimeter wave source; Scattering measurement; Quasi-optical antenna; Cyclotron harmonic operation; Superconducting magnet; プラズマ散乱計測; サブミリ波散乱計測; 負吸収現象; メ-ザ-作用; 周波数可変ジャイロトロン; SCマグネット; Gyrotron; Submillimeter wave source; Scattering measurement; Quasi-optical antenna; Cyclotron harmonic operation; Superconducting magnet; プラズマ散乱計測; サブミリ波散乱計測; 負吸収現象; メ-ザ-作用; 周波数可変ジャイロトロン; SCマグネット

A gyrotron is a high power source covering millimeter and submillimeter wavelength ranges. We are planning the development of high frequency, cyclotron harmonic gyrotrons and their application to scattering measurement of plasma.1. Development of a gyrotron covering a submillimeter wavelength rangeWe have made up a 8-12 T superconducting magnet which is optimized for a gyrotron and designed an electron gun and a cylindrical cavity to construct the gyrotron tube. We have tested the gyrotrons made on the basis of the designs and obtained following results.(1) A new harmonic gyrotron has produced a submillimeter wave, output power at the 2nd harmonic resonance. Its maximum frequency is 404 GHz (the corresponding wavelength is 0.75 mm) and its power is several kW. Gyrotron IVA of University of Sydney has achieved high frequency operations up to 516 GHz, which is the world record for a stable gyrotron. The work was done under collaboration with our group.(2) Cyclotron harmonic operations up … More to 3rd have been observed at 354 GHz (TE_<161> cavity mode), which are necessary for a high frequency gyrotron. Our gyro-peniotron has produced a high power (-3.3kW) at a high frequency (-140 GHz) under the 3rd harmonic resonance.(3) We have successfully done a long pulse operation up to 600 msec under the second harmonic operation at 354 GHz (the corresponding wavelength is 0.85 mm). The operation is used for scattering measurement of plasma.(4) Computer simulation results show the mode competition between the fundamental and the second harmonic operations. The results are confirmed by using our submillimeter wave gryotron. We have found the conditions for single mode operation at the second harmonic, which is necessary for high frequency gyrotron as a submillimeter wave source.2. Application of a submillimeter wave gyrotron to scattering measurement of plasma(1) We have developed elements for quasi-optical circuit, for example, quasi-optical antennae, using outputs of our gyrotrons. The elements are used in the scattering measurement system for plasmas.(2) We have constructed the system using our gyrotron as a power source and applied it to the helical system (CHS) of National Institute of Fusion Science and succeeded to observe a spontaneously excited, low frequency drift wave. Less

Gyrotron是覆盖毫米和亚毫升波长范围的高电源。我们正在计划开发高频，回旋谐波旋转及其在等离子体的散射测量中的应用。覆盖亚毫米级波长范围的陀螺仪的开发构成了8-12 T的超导磁体，该磁铁可针对循环进行优化，并设计了电子枪和一个圆柱形腔以构造陀螺仪管。我们已经根据设计测试了陀螺仪，并获得了以下结果。（1）新的谐波旋转子在第二个谐波共振下产生了亚毫升波，输出功率。它的最大频率为404 GHz（相应的波长为0.75毫米），其功率为多个kW。悉尼大学的Gyrotron IVA达到了高频运营，最高可达516 GHz，这是稳定的陀螺仪的世界纪录。 （2）在354 GHz（TE_ <161>腔模式）上观察到了回旋子谐波操作的工作。我们的陀螺仪在第三次谐波共振下以高频（-140 GHz）产生了高功率（-3.3kW）。（3）在354 GHz处的第二次谐波操作下，我们成功地完成了长达600毫秒的长脉冲操作（相应的波长为0.85 mm）。该操作用于等离子体的散射测量。（4）计算机模拟结果显示了基本和第二谐波操作之间的模式竞争。通过使用我们的亚毫米波gro肉证实结果。我们发现了在第二个谐波下单个模式操作的条件，这对于高频循环作为亚毫米波源是必需的。2。使用我们的陀螺素的输出，将亚毫升波循环应用于等离子体的散射测量（1），例如，我们开发了准光学电路的元素，例如准光天线。 （2）我们已经使用循环来构建了该系统作为电源，并将其应用于国家融合科学研究所的螺旋系统（CHS），并成功地观察了一个赞助的低频漂移波。较少的