Conversion of Submillimeter Wave Gyrotrn Output into a high Quality Beam and its Application to Plasme Scattering Measurement

亚毫米波陀螺输出转换为高质量光束及其在等离子体散射测量中的应用

基本信息

批准号：
06680441
负责人：
OGAWA Isamu
金额：
$ 1.34万
依托单位：
FUKUI UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1994
资助国家：
日本
起止时间：
1994 至 1995
项目状态：
已结题

项目摘要

Objectives : Production of high quality, intense submillimeter wave beam and its application to plasma scattering measurement with the aim of improving performance of the measurement (S/N ratio, spatial and wave number resolutions)The results :1. Development of a high frequency gyrotron as intense power source in submillimeter wave rangeA high frequency gyrotron in the submillimeter wavelength range using 17 T superconducting magnet has been designed and constructed. Experimental results have demonstrated operation from 158 to 443 GHz at the fundamental and from 336 to 838 GHz at the second harmonic. A submillimeter wave gyrotron can also produce steady outputs in a long pulse (P=110 W,power fluctuation level<8%, f=354 GHz, tau-0.6s) by closely adjusting the operation parameters.2. Development of quasi-optical transmission line for producing a high quality beamA new transmission line is designed for converting gyrotron output into a high quality beam. This consists of a quasi-optical antenna, mirrors and polarizer. Analysis using the Huygens equation supports that this system can produce a high quality beam. There is no sidelobe of more than-30 dB.Most of the power (83%) of the image source is transferred to beam center.3. Plasma scattering measurement using a submillimeter wave gyotron as a power sourceIn order to obseve low frequency density fluctuations in the CHS (Compact Helical System) plasma, a plasma scattering measurement using a submillimeter wave gyrotron as a power source is carried out in ICRF heated plasmas. The results correspond to those of reflectmetry with frequency of 39 GHz. The final goal is to apply a high quality, high intensity beam in the submillimeter wave range to scattering measurements with the aim of improving performance of the measurement (S/N ratio, spatial and wave number resolutions).

目标：产生高质量、强亚毫米波束及其在等离子体散射测量中的应用，旨在提高测量性能（信噪比、空间和波数分辨率）结果： 1．亚毫米波范围内强功率高频回旋管的开发利用17T超导磁体设计并构建了亚毫米波范围内的高频回旋管。实验结果表明，基波工作频率为 158 至 443 GHz，二次谐波工作频率为 336 至 838 GHz。通过密切调整工作参数，亚毫米波陀螺仪也能在长脉冲（P=110W，功率波动水平<8%，f=354GHz，tau-0.6s）下产生稳定的输出。 2．开发用于产生高质量光束的准光传输线设计了一种新的传输线，用于将回旋管输出转换为高质量光束。它由准光学天线、镜子和偏振器组成。使用惠更斯方程的分析表明该系统可以产生高质量的光束。没有超过-30 dB的旁瓣。图像源的大部分功率（83%）转移到波束中心。3．使用亚毫米波回旋管作为电源的等离子体散射测量为了观测CHS（紧凑螺旋系统）等离子体中的低频密度波动，在ICRF加热等离子体中进行了使用亚毫米波回旋管作为电源的等离子体散射测量。结果与频率为 39 GHz 的反射测量结果相对应。最终目标是将亚毫米波范围内的高质量、高强度光束应用于散射测量，以提高测量性能（信噪比、空间和波数分辨率）。