Helical Configuration with Low Ripple and High beta Stability

具有低纹波和高 beta 稳定性的螺旋结构

• 批准号: 08044108
• 负责人: MATSUOKA Keisuke
• 金额: $ 1.86万
• 依托单位: National Institute for Fusion Science
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for international Scientific Research
• 财政年份: 1996
• 资助国家: 日本
• 起止时间: 1996 至 无数据
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08044108/
• 关键词: Helical field; Helical ripple; Power deposition; Diamagnetic loop; Fokker-Planck code; Optimization; Magnetic coordinate

For general discussions on the collaboration Prof.Motojima and Mr.R.Pavlichenko (graduate student of The Graduate University for Advanced Studies) visited Kiev and Kharkov in June. Mr.Pavlichenko brought a lot of materials on the design study of Uragan-2M torsatron (U-2M). U-2M is characterized with its low helical ripple, and combination of toroidal field ripple and helical ripple makes the effective ripple small. Although its experimental results will give us an important guide-line on the effect of helical ripple on the plasma confinemnt, its operation has not started yet because of bad economical conditions in Ukraine.Dr.Fedyanin presented his new idea of a diamagnetic loop, which gives us a high temporal resolution in measuring the plasma stored energy. He showed experimental results from L-2M stellarator. The prompt loss of energetic electrons which are accelerated in the electron cyclotron resonance heating (ECH) plays an important role in determining the power deposition. Usual … More ly the power deposition is estimated by the electron temperature change (with ECE measurement) after the turn-off of the heating power. However the accuracy of this ECE method is inversely proportional to the temporal resolution. The diamagnetic loop with high temporal resolution will be a powerful tool for the transport analysis of ECH plasma. Prof.O.Pavlichenko discussed with CHS group to promote a remote participation in CHS and LHD experiments, which will be an important subject in a worldwide fusion society. Dr.Marushchenko discussed the velocity distribution of electrons of a ECH plasma in CHS.The distribution is sensitive to the helical ripple which induces the loss of perpendicularly accelerated electrons. He is developing the Fokker-Planck computer code for this estimate with CHS experimentalists. Dr.Pustovitov is a great specialist in the MHD theory of helical plasma. He has made a lot of contributions to the theory in Japan since his first visit (1992). This year he found a simple and clear relation between magnetic coordinates (Hamada-and Boozer-coordinates). It is easily understood that coordinate usually used in tokamak is similar to the Boozer coordinate. The magnetic coordinates are essential to the optimization of helical nagnetic configuration. Based on these discussions we are designing a quasi-toroidally symmetric stellarator, which is the optimized configuration with essentially no helical ripple. Less

为了就合作进行一般性讨论，Motojima教授和R.Pavlichenko先生（高等研究生院研究生）于6月访问了基辅和哈尔科夫。帕夫利琴科先生带来了大量关于Uragan-2 M扭转加速器（U-2 M）设计研究的资料。U-2 M的特点是螺旋涟漪小，环向场涟漪和螺旋涟漪的结合使有效涟漪小。尽管它的实验结果将为我们研究螺旋涟漪对等离子体约束的影响提供重要的指导，但由于乌克兰经济条件不好，它还没有开始运行。Fedyanin博士提出了他的抗磁环的新想法，它使我们在测量等离子体储存能量时具有很高的时间分辨率。他展示了L-2 M仿星器的实验结果。在电子回旋共振加热（ECH）中，加速的高能电子的迅速损失在决定功率沉积方面起着重要作用。往常 ...更多信息 因此，功率沉积通过在加热功率关闭之后的电子温度变化（利用ECE测量）来估计。然而，该ECE方法的精度与时间分辨率成反比。高时间分辨率的抗磁环将成为ECH等离子体输运分析的有力工具。Pavlichenko教授与CHS小组讨论了促进远程参与CHS和LHD实验的问题，这将是全球聚变社会的一个重要课题。Marushchenko博士讨论了CHS中ECH等离子体的电子速度分布，该分布对引起垂直加速电子损失的螺旋涟漪敏感。他正在与CHS实验学家一起开发Fokker-Planck计算机代码。普斯托维托夫博士是螺旋等离子体磁流体理论的伟大专家。自1992年首次访日以来，他对日本的理论做出了许多贡献。今年，他发现了磁坐标（Hamada坐标和Boozer坐标）之间简单而明确的关系。很容易理解，托卡马克中常用的坐标系与布泽尔坐标系是相似的。磁坐标是螺旋磁位形优化的基础。基于这些讨论，我们正在设计一个准环对称仿星器，这是基本上没有螺旋涟漪的优化配置。少

项目成果

K.Matsuoka et al.: "Post-CHS project" Plasma Physics Reports (official English translation of Fizika Plazmy). vol.23. (1997)

K.Matsuoka 等人：“后 CHS 项目”等离子体物理报告（Fizika Plazmy 的官方英文翻译）。

K,Matsuoka: "Post-CHS Project" Plasma Physics Reports (Fizika Plazmyの公式英語訳). 23. (1997)

K, Matsuoka：“后 CHS 项目”等离子体物理报告（Fizika Plazmy 的官方英文翻译）23。（1997 年）。

K,Matsuoka et al.: "Post-CHS project" Plasma Physics Reports. 23. (1997)

K,Matsuoka 等人：“后 CHS 项目”等离子体物理报告。