Measurement of Plasma Density and Magnetic Fluctuations using Microwave Reflectometers and Probes

使用微波反射计和探头测量等离子体密度和磁涨落

• 批准号: 07458088
• 负责人: INUTAKE Masaaki
• 金额: $ 4.93万
• 依托单位: Tohoku University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1995
• 资助国家: 日本
• 起止时间: 1995 至 1996
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07458088/
• 关键词: Microwave reflectometer; Density fluctuation; Magnetic fluctuation; Radial electric field; Flute mode instability; Drift mode instability; Plasma; ミリ波反射計; 電位制御; 密度制御; 不安定性

(1) A new diagnostic, a microwave reflectometer, is developed in order to measure the electrostatic and electromagnetic fluctuations excited in a magnetized plasma. The reflectometer in the frequency range of 8-18 GHz has calibrated by using a vibrating metal plate and set at the HITOP device. The density fluctuations measured by the reflectometer agree well with that observed by Langmuir probes.(2) Low-Frequency fluctuations related with a radial electric field are investigated in a magnetized plasma produced by the electron cyclotron resonance. When the radial potential profile is controlled by biasing a segmented endplate, flute mode fluctuations are observed to be predominantly excited in a range of positive electric fields, while drift mode fluctuations are observed to persist in the case where the electric field is almost zero. The drift mode fluctuations are stabilized with an increase in the radial electric-field strength.

(1) 开发了一种新的诊断装置——微波反射计，以测量磁化等离子体中激发的静电和电磁波动。 8-18 GHz频率范围的反射计已使用振动金属板进行校准并设置在HITOP设备上。反射计测得的密度涨落与朗缪尔探针观测到的密度涨落吻合良好。(2)研究了电子回旋共振产生的磁化等离子体中与径向电场相关的低频涨落。当通过偏置分段端板来控制径向电势分布时，观察到凹槽模式波动主要在正电场范围内被激发，而在电场几乎为零的情况下观察到漂移模式波动持续存在。随着径向电场强度的增加，漂移模式波动变得稳定。

项目成果

M.Yoshinuma: "Control of Radial Potential Profile and Related Low-Frequency Fluctuations in an ECR-Produced Plasma" The 5th Symposium on Double Layers-Potential Formation and Related Nonlinear Phenomena in Plasmas,Sendai. P-1-13 (1996)

M.Yoshinuma：“ECR 产生的等离子体中径向电势分布和相关低频波动的控制”第五届等离子体中双层电势形成和相关非线性现象研讨会，仙台。

M.Inutake: "Control of Axial and Radial Potential Profies in Tandem Mirrors" 5th Int.Symp.on Double Layers,Sendai. 1-2-1 (1996)

M.Inutake：“控制串联镜中的轴向和径向电位曲线”第五届 Int.Symp.on 双层，仙台。

A.Ando: "Characteristics of the HITOP (High density Tohoku Plasma) Device for Magneto-Hydro-Dynamic Studies" Proc.Int.Conf.on Plasma Physics. 2. 2014-2017 (1996)

A.Ando：“用于磁流体动力学研究的 HITOP（高密度东北等离子体）装置的特性”Proc.Int.Conf.on 等离子体物理学。

服部邦彦: "高密度電磁流体実験装置(HITOP)の開発" プラズマ研究会資料(電気学会). EP-96-96. 11-20 (1996)

Kunihiko Hattori：“高密度磁流体动力学实验装置（HITOP）的开发”等离子体研究小组材料（日本电气工程师学会） EP-96-96（1996）。

A.Mase: "Measurement of ICRF wave in the GAMMA10 tandem mirror using reflectometers" Rev.Sci.Instrum.66・1. 821-823 (1995)

A.Mase：“使用反射计测量 GAMMA10 串联镜中的 ICRF 波”Rev.Sci.Instrum.66・1（1995 年）。