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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和转向器模拟的环形装置NAGDIS-T的结构机器参数如下：长半径RO = 34 cm，宽2a =18 cm，高2b = 28 cm，环形场和垂直场：Bt = 0.1T，Bv = 10 G。在脉冲宽度为50 ms，氘气压为P~1 mTorr的条件下，通过注入20 kW的射频功率进行交流焦耳加热，获得了等离子体密度为ne~1018 m-3，电子温度为Te~10 eV的等离子体。一个简单的等离子体产生的数值模型，并发现再现等离子体密度的气体压力依赖性。利用直流放电产生了ne·1019 m-3和Te~5 eV的稳定螺旋环形等离子体，为脉冲操作模拟ELM提供了前景.等离子体热和粒子的突发非局域输运研究--利用概率密度函数、复Morlet母函数小波变换和分形分析对时间序列数据进行统计分析 ...更多信息由于Budaev博士的贡献，它成为本项目的一个非常重要的工具，获得了NAGDIS-Ⅱ观测到的间歇性突发波动的径向速度分布函数。在特定的子波尺度范围内，得到了大振幅的速度分布，平均速度可达800 m/s. In. JT-60 U SOL中间歇性突发波动的性质，Isat的偏斜度在dsep = 60-80 mm附近达到峰值，在此位置，在L模式和ELMy H模式的ELM之间，SOL的平均平行流动方向从向上变为向下。Isat的径向衰变长度在那里增加。ELM期间Isat的衰减长度约为ELM之间Isat的衰减长度的三倍。HYBTOK-II托卡马克等离子体中的动态各态历经偏滤器位形（DED）的涨落倾向于以极线方式传播，并且主要与DED的旋转方向一致，类似于混沌控制。少