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

基本信息

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

项目摘要

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

陀螺仪是高源毫米和小路范围。陀螺仪，我们已经在设计上测试了陀螺仪，并获得了新的谐波循环。在354 GHz（TE_ <161> favity Mode）上，吉利（Gyrotron）的高频行动已达到516 GHz。在354 GHz的第二个谐波操作下，我们成功完成了一个长达600毫秒的脉冲选项（相对波长为0.85 mm）在第二个谐波频率循环中具有单模式操作作为亚毫升频率源2。天线，将元素用于等离子体的散射测量系统，并将其应用于国家融合科学和学校Uency漂移波的螺旋系统（CHS）