Scattering of High Energy Ions due to Spontaneously Excited Alfven Waves

自发激发阿尔文波引起的高能离子散射

• 批准号: 10480097
• 负责人: ICHIMURA Makoto
• 金额: $ 0.7万
• 依托单位: University of Tsukuba
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1998
• 资助国家: 日本
• 起止时间: 1998 至 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10480097/
• 关键词: Spontaneously Excited Alfven Wave; High-energy Ion; Pitch Angle Distribution; Magnetic Fluctuation; Alfven Ion Cyclotron Wave; Boundary Condition; Temperature Anisotropy; 自発励起アルペン波動

In the GAMMA 10 tandem mirror, plasmas with the strong temperature anisotropy are created when the ion cyclotron range of frequency (ICRF) heating is applied. The Alfven ion cyclotron (AIC) modes are spontaneously excited in the plasma due to such the strong temperature anisotropy. In this research, we studied the excitation mechanism of the Alfven waves and the correlation between high energy ions and spontaneously excited waves. Obtained results are summarized as followings ;1. The AIC modes in the GAMMA 10 tandem mirror are observed to be unstable in the parameter range below an order of magunitude lower than the parameters predicted by the theory. The AIC modes are excited as eigenmodes which have the boundary in the axial direction. The boundary is determined by the plasma pressure.2. We constructed a diagnostics system to evaluate the plasma parameters by injecting low power ICRF waves. The antenna loading and the amplitude of the excited waves are measured. It becomes clear the antenna loading decreases and the waves are resonantly excited in the frequency range of the AIC modes with a positive growth rate. This indicates the AIC modes are firstly excited by the external antenna.3. We constructed another diagnostic system with a semi-conductor detector to measure the pitch angle distribution of high energy ions in the central cell. It becomes clear the pitch angle distribution of high energy ions is determined from the effects of the heating by ICRF waves and the scattering by spontaneously excited waves.4. The end loss ions have strong correlation with the amplitude of the AIC mode in the central cell. It becomes clear experimentally the hot ions created in the central cell are scattered into the loss cone and lossed to the end by the AIC modes.

在伽马10串联镜中，当应用频率（ICRF）加热的离子回旋范围范围时，会产生具有较强温度各向异性的等离子体。由于温度较强的各向异性，Alfven离子转基因（AIC）模式在血浆中自发激发。在这项研究中，我们研究了Alfven波的激发机理以及高能离子与自发激发波之间的相关性。获得的结果总结为以下； 1。观察到伽马10串联镜中的AIC模式在魔法范围以下的参数范围低于该理论所预测的参数。 AIC模式被激发为具有轴向边界的本征模。边界由等离子体压力确定。2。我们构建了一个诊断系统，通过注入低功率ICRF波来评估等离子参数。测量激发波的天线载荷和振幅。很明显，天线载荷减小，并且在AIC模式的频率范围内，波动的载荷会激发，并具有正增长速率。这表明AIC模式首先被外部天线激发3。我们用半导体检测器构建了另一个诊断系统，以测量中央细胞中高能离子的螺距角度分布。很明显，高能离子的螺距角分布取决于ICRF波的加热和自发激发波的散射。4。最终损耗离子与中央单元中AIC模式的振幅具有很强的相关性。从实验上讲，中央细胞中产生的热离子被散布到损耗锥中，并通过AIC模式损失。

项目成果

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K.Yatsu,T.Cho et al.: "Potential Control for Improvement of Confinement in the GAMMA 10 Tandem Mirror"Czechoslova Journal of Physics, Suppl.. S3. 155-166 (1999)

K.Yatsu,T.Cho 等人：“GAMMA 10 串联镜中限制改善的潜在控制”捷克斯洛伐物理学杂志，增刊 S3。

A. Mase, T. Tokuzawa, L.G. Bruskin, Y. Kogi, S. Kubota, N. Oyama, T. Onuma, N. Goto, H. Negishi, Y. Shima, A. Itakura, H. Hojo, M. Ichimura, T. Tamano, K. Yatsu,: "Density Profile and Fluctuation Measurements with Microwave Reflectometry on GAMMA 10"trans

A. Mase、T. 德泽、L.G.

Y.Kiwamoto,Y Kikuchi et al.: "Pinhole Camera Imaging of X Rays and Energetic Neutral Atoms for Hot Plasma Diagnostics"Rev. Sci. Instrum.. 69・6. 2574-2575 (1998)

Y. Kiwamoto、Y Kikuchi 等：“用于热等离子体诊断的 X 射线和高能中性原子的针孔相机成像”Rev. 69・6 (1998)。

M.Ichimura,C.Satake et al.: "Behaviour of High Energy Ions in the GAMMA 10 Tandem Mirror"Review of Scientific Instruments. 70・1. 834-837 (1999)

M.Ichimura、C.Satake 等人：“GAMMA 10 串联镜中高能离子的行为”科学仪器评论 70・1 (1999)。