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Coherent edge fluctuation measurements in H-mode discharges on JFT-2M

机译：JFT-2M在H模式放电中的相干边缘波动测量

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摘要

Results of coherent edge fluctuation measurements using three diagnostics (a reciprocating Langmuir probe, a two channel O-mode reflectometer, and fast magnetic probes) in H-mode discharges on JFT-2M are presented. In discharges in which a high recycling steady (HRS) H-mode phase is obtained through a transient phase with slightly enhanced-D-alpha intensity, two types of coherent fluctuations are observed. The higher frequency mode (around 300 kHz) is the high frequency mode (HFM) observed in the HRS H-mode (Kamiya K et al 2003 9th IAEA Tech. Meeting H-mode Workshop Topic B-14). The lower frequency mode has a frequency of around 80 kKz. The HFM is detected by a Langmuir probe over a wide region in the SOL, as well as by the reflectometer and magnetic probes. However, the HFM is not detected by the higher frequency (38 GHz) channel of the reflectometer after the HRS transition, suggesting that the HFM is not located deeply inside the plasma. The 80 kHz mode is detected by both channels of the reflectometer and by a Langmuir probe; but not by magnetic probes, suggesting that it is an electrostatic mode. In contrast to the HFM, the 80 kHz mode is detected by the Langmuir probe only near the separatrix during the transient phase, which leads to either the HRS phase or the ELMy phase, and is similar to the fluctuations reported in Shinohara K et al (1998 J Plasma Fusion Res. 74 607).
机译：给出了在JFT-2M的H型放电中使用三种诊断仪（往复式Langmuir探针，两通道O型反射仪和快速磁探针）进行相干边缘波动测量的结果。在通过短暂增加D-α强度的过渡相获得高循环稳定（HRS）H模式相的放电中，观察到两种类型的相干波动。较高频率的模式（大约300 kHz）是在HRS H模式下观察到的高频模式（HFM）（Kamiya K等人，2003年，第9届IAEA技术会议H模式研讨会主题B-14）。较低频率模式的频率约为80 kKz。 HFM可以通过Langmuir探针在SOL的宽范围内进行检测，也可以通过反射计和磁性探针进行检测。但是，在HRS转换之后，反射计的较高频率（38 GHz）通道未检测到HFM，这表明HFM不在等离子体内部。反射计的两个通道和Langmuir探头均可检测到80 kHz模式。但不是通过磁探针，这表明它是静电模式。与HFM相反，Langmuir探针仅在过渡阶段的分离线附近检测到80 kHz模式，这导致了HRS阶段或ELMy阶段，并且类似于Shinohara K等人（ 1998 J Plasma Fusion Res.74 607）。

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