Studies on Nonlocal Bursty Transport of Plasma Heat and Particles in Toroidal Divertor Configuration

环形偏滤器结构中等离子体热和粒子非局部突发传输的研究

基本信息

批准号：
14208052
负责人：
TAKAMURA Shuichi
金额：
$ 26.21万
依托单位：
Nagoya University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2004
项目状态：
已结题

项目摘要

1. Construction of Toroidal Device NAGDIS-T for SOL and Divertor Simulation StudiesMachine parameters are as follows: Major radius RO = 34 cm, width 2a =18 cm, Height 2b = 28 cm, Toroidal and vertical fields: Bt = 0.1 T, Bv = 10 G. The plasma density of ne~1018 m-3 and the electron temperature of Te~10 eV with the pulse length of 50 ms under the deuterium gas pressure of P~1 mTorr have been obtained by the injection of RF power of 20 kW for AC Joule heating. A simple numerical model for the plasma generation is employed and found to reproduce the gas pressure dependence of plasma density. A steady spiral toroidal plasma production using DC discharge of ne・1019 m-3 and Te~5 eV has been obtained for the prospect of ELM simulation by a pulsed operation.2. Research on bursty nonlocal transport of plasma heat and particlesStatistical analysis of time-series data with the help of probability density function, wavelet transform associated by complex Morlet mother function, and fractal analysi … More s becomes a very important tool for the present project owing to the contributions of Dr. Budaev.Radial velocity distribution function of intermittent bursty fluctuations observed in NAGDIS-II has been obtained. The velocity distribution with large amplitude at a specific range of of wavelet scale was also demonstrated, and the mean velocity is found as fast as 800 m/s.In. the properties of intermittent bursty fluctuations in JT-60U SOL, the skewness of Isat peaks around dsep = 60-80 mm where the direction of the mean parallel SOL flow changes upward to downward in both L-mode and between ELMs of ELMy H-mode. The radial decay length of Isat increases there. The decay length of Isat during ELM is about three times as large as one of Isat between ELMs. The ELMs seem like blobsThe fluctuations in HYBTOK-II tokamak plasma with dynamic ergodic divertor configuration (DED) tend to propagate poloidally and predominantly in accordance with the DED rotation direction, something like chaos control. Less

1. 用于 SOL 和偏滤器模拟研究的环形装置 NAGDIS-T 的构造机器参数如下：主半径 RO = 34 cm，宽度 2a = 18 cm，高度 2b = 28 cm，环形和垂直场：Bt = 0.1 T，Bv = 10 G。脉冲长度为 ne~1018 m-3 的等离子体密度和 Te~10 eV 的电子温度通过注入 20 kW 的射频功率进行交流焦耳加热，在 P~1 mTorr 的氘气压下获得了 50 ms。采用了等离子体生成的简单数值模型，并发现该模型可以再现等离子体密度的气体压力依赖性。利用ne·1019 m-3和Te~5 eV的直流放电实现了稳定的螺旋环形等离子体的产生，为脉冲运行的ELM模拟提供了前景。 2．等离子体热和粒子借助概率密度函数、与复杂的 Morlet 母函数相关的小波变换和分形分析对时间序列数据进行统计分析……由于 Budaev 博士的贡献，它成为当前项目的一个非常重要的工具还得到了NAGDIS-II观测到的间歇性突发波动的径向速度分布函数，并证明了在特定小波尺度范围内的大振幅速度分布，并求出了平均速度。 800 m/s.In. JT-60U SOL 中间歇性突发波动的特性，Isat 峰值在 dsep = 60-80 mm 附近，其中平均平行 SOL 流的方向在 L 模式和在ELMy H 模式的ELM 之间，Isat 的径向衰减长度在那里增加。ELM 期间Isat 的衰减长度大约是其中之一的三倍。 ELM 之间的 ELM 看起来像斑点。具有动态遍历偏滤器配置 (DED) 的 HYBTOK-II 托卡马克等离子体中的波动倾向于极向传播，并且主要按照 DED 旋转方向传播，类似于混沌控制。