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Pedestal characteristics in JFT-2M FIRS H-mode plasma

机译:JFT-2M FIRS H型等离子体的基座特性

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Recent experiments in the JFT-2M tokamak have concentrated on studies of the access conditions for H-mode operation without any large ELMs, namely the 'high recycling steady' (HRS) H-mode regime, in terms of the pedestal parameters. The HRS regime is more likely to occur at higher edge density and lower edge temperature, while the ELMy H-mode having large ELMs appears at lower edge density and higher edge temperature. It is found that the ELMy/HRS operational boundary occurs at the normalized electron collisionality of nu(e)* similar to1 in the plasma edge region, depending slightly on the safety factor at 95% flux surface q(95). A key feature of the HRS H-mode is the presence of coherent magnetic fluctuations in the frequency range of the order of 10-100 kHz. It is suggested that the edge MHD activities may keep the edge pressure below a certain level needed to induce a large ELM.
机译:在JFT-2M托卡马克中,最近的实验集中在没有任何大型ELM的情况下研究H模式操作的进入条件,即就基座参数而言,即“高循环稳定”(HRS)H模式方案。 HRS机制更可能在较高的边缘密度和较低的边缘温度下发生,而具有较大ELM的ELMy H模式在较低的边缘密度和较高的边缘温度下出现。发现ELMy / HRS操作边界出现在nu(e)*的归一化电子碰撞性上,类似于在等离子体边缘区域中的1,这略微取决于95%通量表面q(95)的安全系数。 HRS H模式的关键特征是在10-100 kHz量级的频率范围内存在相干磁波动。建议边缘MHD活动可以将边缘压力保持在诱发大ELM所需的一定水平以下。

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