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首页> 外文期刊>Plasma physics and controlled fusion >Density fluctuation measurement at edge and internal transport barriers in JT760U
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Density fluctuation measurement at edge and internal transport barriers in JT760U

机译：JT760U边缘和内部传输壁垒的密度波动测量

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摘要

A new analytical method using a combination of the O-mode reflectometer and a time-dependent two-dimensional full-wave simulation code has been developed for the quantitative evaluation of density fluctuations in JT-60U. Two statistical parameters of the reflectometer signals, fluctuation index (F) and elongation factor (chi), are introduced as measures of the fluctuation amplitude (gamma) and the width of the poloidal wave number spectrum (k(theta0)). This method is applied to the edge transport barrier (ETB) and internal transport barrier (ITB). At the transition to the ELM free H-mode please, analysis suggests that the density fluctuation level reduced from 1.9-3.2% to 0.29-0.44%, while the value of k(theta0) changed from 1.6-2.0 to 0.77-0.81 cm(-1) in-the ETB region. On the other hand, the amplitude of the density fluctuation was evaluated as 1.0-2.0% at the ITB region, even after the formation of the box type ITB. Instead, when a pellet was injected into the plasma with a box type ITB as an external perturbation, a remarkable change in the frequency spectrum was observed. Analysis suggests a reduction in the density fluctuation level to 0.4-0.6% after the pellet injection.
机译：已经开发出一种新的分析方法，该方法结合使用O型反射计和随时间变化的二维全波模拟代码来定量评估JT-60U中的密度波动。引入了反射计信号的两个统计参数，即波动指数（F）和伸长因子（chi），作为波动幅度（γ）和极向波数谱宽度（k（theta0））的度量。此方法适用于边缘传输屏障（ETB）和内部传输屏障（ITB）。在过渡到无ELM H模式时，分析表明密度波动水平从1.9-3.2％降低到0.29-0.44％，而k（θ0）的值从1.6-2.0改变为0.77-0.81 cm（ -1）在ETB地区。另一方面，即使在形成箱型ITB之后，在ITB区域的密度波动的幅度也被评估为1.0-2.0％。相反，当使用箱型ITB作为外部扰动将颗粒注入等离子体时，观察到频谱发生了显着变化。分析表明，注射颗粒后，密度波动水平降低到0.4-0.6％。

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