Study of the Current Circulation through the End Region of a Tandem Mirror and Its Suppression

串联镜端部环流及其抑制的研究

• 批准号: 09680454
• 负责人: SAITO Teruo
• 金额: $ 2.24万
• 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 (C)
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1998
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09680454/
• 关键词: Plasma; Tandem Mirror; End Plate; Current Control; Non ambipolar current; ブラズマ

Electrically floating end plates are used for suppression of the non ambipolar diffusion stemming from the open filed configuration in a tandem mirror. However, experiments show that many issues are still open. 1. A residual non ambipolar diffusion remains. 2. Secondary electron emission due to ECRH - induced end loss electrons leads to a thermal loss to the end plates. 3. The mechanism of the three dimensional potential profile is not clear.Therefore, the present research has been carried out on the GAMMA 10 tandem mirror with two main objectives. 1. To Evaluate the non ambipolar current at the end plate from an integrated analysis of the current balance at the end plate. 2. To obtain a physical picture of the current circulation through the end plate and to reveal the current distribution through the plasma and the vacuum vessel.Main results of the present research are1. Necessity of a new current component at the end plate has been shown which compensates the current imbalance. This current amounts to a few tens of percent of the end loss electron current.2. Two ion current components have been discovered as counter parts of the new current. One is the ion current through the backside of the end plate ant the other originates from ionization neutral hydrogen atoms in the end region.3. A radial ion current has been observed during ECRH as a limiter current in the plug/barrier cell.4. A strong correlation has been shown between the radial ion current and the new current component at the end plate, which indicates a current circuit is formed between the plug/ barrier cell and the end plate. Furthermore, a current component has been observed in the radial ion current that likely originates in the central cell region.

电浮动端板用于抑制串联反射镜中源于开放场配置的非双极扩散。然而，实验表明，许多问题仍然是开放的。1.残留的非双极扩散。2.由于ECRH引起的端部损失电子导致的二次电子发射导致端板的热损失。3.三维势分布的形成机理尚不清楚，因此，本研究是在双物镜的伽马10串列反射镜上进行的。1.通过对端板电流平衡的综合分析来评估端板的非双极电流。2.获得了电流通过端板的物理图象，揭示了电流在等离子体和真空室中的分布。已经示出了在端板处的新的电流分量的必要性，其补偿电流不平衡。这个电流相当于末端损失电子电流的百分之几十。已经发现两个离子电流分量作为新电流的对应部分。一个是通过端板背面的离子流，另一个是端部电离的中性氢原子.在ECRH过程中观察到径向离子流作为塞/势垒电池中的限制电流。径向离子电流和端板处的新电流分量之间具有很强的相关性，这表明塞/势垒电池和端板之间形成了电流回路。此外，在径向离子电流中观察到电流分量，其可能起源于中央单元区域。

项目成果

T.Saito,M.Ichimura,et al.: "Enhanced Axial Loss of Electrons from a Tandem Mirror Induced by an Alfven Ion Cyclotron Wave" Physical Review Letters. 82・6. 1169-1172 (1999)

T. Saito、M. Ichimura 等人：“阿尔文离子回旋波引起的串联镜的增强轴向电子损失”物理评论快报 82・6 (1999)。

Y.Kiwamoto,Y.Kikuchi,et al.: "Pin-hole camera imaging of x-rays and energetic neutral atoms for hot plasma diagnostics" Review of Scientific Instruments. 69・6. 2574-2575 (1998)

Y.Kiwamoto、Y.Kikuchi 等人：“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”科学仪器评论 69・6 (1998)。

K.Kajiwara,T.Saito,et al.: "Validity of a Model Electron Distribution Function in an End Region of a Tandem Mirror" Journal of the Physical Society of Japan. 67・8. 3647-3648 (1998)

K. Kajiwara、T. Saito 等：“串联镜端部区域中的模型电子分布函数的有效性”日本物理学会杂志 67・8（1998 年）。

Y.Tatematsu, Y.Kiwamoto, T.Saito, et al.: "Non-Relativistic Response Function for Higher Harmonic Electron Cyclotron Resonance Heating" Physics of Plasmas. 4-8. 2972-2981 (1997)

Y.Tatematsu、Y.Kiwamoto、T.Saito 等人：“高次谐波电子回旋共振加热的非相对论响应函数”等离子体物理学。

T.Tanaka,M.Ichimura,et al.: "Macroscopic Stability Control Experiments with Phased Antennas in the GAMMA 10 Tandem Mirror" Journal of the Physical Society of Japan. 67・6. 1963-1967 (1998)

T. Tanaka、M. Ichimura 等人：“GAMMA 10 Tandem 镜子中相控天线的宏观稳定性控制实验”日本物理学会杂志 67・6（1998 年）。