Development and Application of a Frequency-Tunable, Submillimeter Wave Gyrotron

回旋管是一种覆盖毫米和亚毫米波长范围的高功率源。我们正在计划发展高频回旋谐波回旋管及其在亚毫米波长范围内的光谱应用。i)亚毫米波长回旋管的开发我们已经组成了一台8-12T超导磁体，它是为回旋管优化的，并设计了一支电子枪和一个圆柱腔来构成回旋管。在此基础上研制的回旋管进行了试验，取得了如下结果。福井大学的一台新的谐波回旋管产生了亚毫米波，输出功率为二次谐波共振。它的频率为404 GHz(对应的波长为0.75 mm)，功率为几千瓦。悉尼大学的回旋管IVA已经实现了高达516 GHz的高频工作，这是稳定回旋管的世界纪录。这项工作是在与福井大学的合作下完成的。观察到了耳语画廊模式的操作。该输出功率可用于研制准光天线，将其转换为线性化模式。观察到回旋加速器的三次谐波工作，这是高频回旋加速器所必需的。我们的回旋管在三次谐波下产生了高功率(-3.3kW)的高频(-140 GHz)。II)亚毫米波回旋管的应用1。我们已经建立了等离子体散射测量系统，并将其应用于京都大学的WT-3托卡马克和悉尼大学的托卡马克托卡马克，成功地观测到了自发激发的低频漂移波和外部激发的阿尔芬波。我们已经利用我们的回旋管的输出研制了准光路元件。我们已经开始使用回旋管作为毫米和亚毫米波长范围内光谱的电源，以研究凝聚态物质的性质。

A gyrotron is a high power source covering millimeter and submillimeter wavelength ranges. We are planning the development of high frequency, cyclotron harmonic gyrotorns and their application to a spectroscopy in the submillimeter wavelength range.I) 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, in Fukui University. Its 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 Fukui University.2. An operation of the whispering gallery mode has been observed. The output power can be used to develop a quasi-optical antenna for its conversion to a linearly poralized mode.3. Cyclotron harmonic operations up to 3rd have been observed, which are necessary for a high frequency gyrotron. Our gyto-peniotron has produced a high power (-3.3kW) at a high frequensy (-140 GHz) under the 3rd harmonic resonance.II) Application of a submillimeter wave gyrotron1. We have constructed the scattering measurement system for plasmas and applied it to WT-3 Tokamak of Kyoto University and TORTUS Tokamak of University of Sydney and succeeded to observe a spontaneously excited, low frequency drift wave and an externally excited Alfen wave.2. We have developed elements for quasi-optical circuit, using outputs of our gyrotrons.3. We have begun to use a gyrotron as a power source for spectroscopy in the millimeter and submillimeter wavelength ranges, to study the properties of condensed matters.