P roduction of an intense, high quality submillimeter wave probe-beam and its application to plasma scattering measurements

强、高质量亚毫米波探测光束的产生及其在等离子体散射测量中的应用

• 批准号: 08680500
• 负责人: OGAWA Isamu
• 金额: $ 1.54万
• 依托单位: FUKUI UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1996
• 资助国家: 日本
• 起止时间: 1996 至 1997
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08680500/
• 关键词: Plasama scattering measurement; Submillimeter wave gyrotron; Submillimeter wave source; Quasi-optical transmission line; Submillimeter wave beam; サブミリ波帯ジャイロトロン; ジャイロトロン; サブミリ波プローブビーム; 準光学的伝送系; Plasama scattering measurement; Submillimeter wave gyrotron; Submillimeter wave source; Quasi-optical transmission line; Submillimeter wave beam; サブミリ波帯ジャイロトロン; ジャイロトロン; サブミリ波プローブビーム; 準光学的伝送系

The design of the quasi-optical transmission line was based on gyrotron output at 354 GHz in order to carry out plasma scattering. This system consists of a quasi-optical antenna to convert the output into an linearly-polarized beam and an elliptical mirror to collimate the beam. Although the beam shape of the beam produced is different from that of calculated result, the size of the beam produced (58mm*55mm) is in broad agreement with that of the calculated result (42mm*67mm).We have used this intense beam to study low frequency density fluctuations by plasma scattering in Compact Helical System (CHS) plasmas at the National Institute for Fusion Science. A peak is found around 150 kHz in the upper spectrum. Although the frequency of the electron drift waves deduced from the plasma parameters changed from 100 kHz to 300 kHz, the observed peak frequency did not change. This suggests that the peak is not merely due to the electron drift waves.A high frequency gyrotron delivers moderate cw outputs (P=20W) at submillimeter wavelengths (f=302GHz). Time resolved frequency measurements show that the frequency fluctuation levels of the cw outputs are within 2MHz. The frequency of the cw output is modulated by the potential modulation of the body. A peak-to-peak value of 120V can produce the frequency modulation of 29MHz.

准光学传输线的设计基于354 GHz的陀螺仪输出，以进行血浆散射。该系统由准光天线组成，将输出转换为线性偏振光束和椭圆镜，以对光束进行填充。尽管产生的光束的光束形状与计算结果的光束形状不同，但产生的光束的大小（58mm*55mm）与计算结果的横梁（42mm*67mm）。我们使用这种强烈的光束来研究紧凑型螺旋系统（CHS）等血浆融合效果的低频密度散射。在上部频谱中发现了约150 kHz的峰。尽管从血浆参数推导的电子漂移波的频率从100 kHz变为300 kHz，但观察到的峰频率没有变化。这表明峰不仅是由于电子漂移波。高频循环子在亚毫米波长（F = 302GHz）下提供中等的CW输出（P = 20W）。时间分解的频率测量表明，CW输出的频率波动水平在2MHz之内。 CW输出的频率是通过身体的潜在调制来调节的。 120V的峰值峰值值可产生29MHz的频率调制。