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

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.

准光传输线的设计基于 354 GHz 的回旋管输出，以进行等离子体散射。该系统由用于将输出转换为线偏振光束的准光学天线和用于准直光束的椭圆镜组成。虽然产生的光束形状与计算结果不同，但产生的光束尺寸（58mm*55mm）与计算结果（42mm*67mm）基本一致。我们使用该强光束在国家融合科学研究所研究紧凑螺旋系统 (CHS) 等离子体中等离子体散射的低频密度波动。在上部频谱中 150 kHz 附近发现了一个峰值。尽管从等离子体参数推导出的电子漂移波的频率从100 kHz变为300 kHz，但观察到的峰值频率没有变化。这表明峰值不仅仅是由电子漂移波造成的。高频回旋管在亚毫米波长 (f=302GHz) 下提供中等连续波输出 (P=20W)。时间分辨频率测量显示 CW 输出的频率波动水平在 2MHz 以内。连续波输出的频率由身体的电位调制来调制。 120V的峰峰值可以产生29MHz的频率调制。

项目成果

J.J.Barroso: "Operation of a 32GHz gyrotron" Int.J.Infrared and Millimeter Waves. 18. 2147-2160 (1997)

J.J.Barroso：“32GHz 陀螺仪的操作”Int.J.红外和毫米波。

I.Ogawa: "Preduction of an intense,well-c ollimated submillimeter wave beam and its application to plasma scattering measurements" Int.J.Infrared and Millimeter Waves. (発表予定).

I.Okawa：“强准直亚毫米波束的产生及其在等离子体散射测量中的应用”Int.J.Infrared and Millimeter Waves（即将发表）。

I.Ogawa: "A quan-cptical transmission line for plasma scattering measuements using a submillimeter wave gyrotron" Int.J.Electronics. 83・5. 635-644 (1997)

I.Okawa：“使用亚毫米波回旋管进行等离子体散射测量的量子传输线”Int.J.Electronics 83・5（1997）。

I.Ogawa: "Plasma scattering measurementsusing a submillimeter wave gyrotron (Gyrotron FU II) as a power source" Fusion Engineering and Design. 34-35. 455-458 (1997)

I.Okawa：“使用亚毫米波回旋管（Gyrotron FU II）作为电源进行等离子体散射测量”融合工程与设计。

T.Idehara: "Amplitude modulation of submillimeter wave gyrotron output" Int.J.Infrared and Millimeter Waves. 18 (2). 391-403 (1997)

T.Idehara：“亚毫米波回旋管输出的幅度调制” Int.J.Infrared and Millimeter Waves。