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Transport characteristics of tracer and intrinsic impurities depending on the density of LHD plasmas

机译：示踪剂和固有杂质的传输特性取决于LHD等离子体的密度

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摘要

By injecting a tracer-encapsulated solid pellet (TESPEL) with triple tracers, V (Z = 23), Mn (Z = 25) and Co (Z = 27), into a plasma in the Large Helical Device (LHD), it was found in the high-density case (typically ne = (5-7) × 10~(19) m~(-3)) that the Kα emissions from the intrinsic impurities were strongly suppressed, while those from all the three tracers were retained for a long time. In the medium-density case (typically ne = (3-4) × 10~(19) m~(-3)), Kα emissions from the intrinsic impurities were observed clearly, while those of the tracer impurities were observed to decay much faster than the high-density case. When the intrinsic impurities penetrate into the plasma core through the plasma periphery in the plasma build-up phase under relatively low-density conditions, then such impurities are found to be kept for a long time in the later phase under high-density conditions. By implementing supersonic Ar gas puffing in addition to the TESPEL injection, Ar Kα emission was clearly observed together with Kα emissions from the tracers in the medium-density case. In contrast to this, Ar Kα emission was completely suppressed in the high-density case. This result shows that the suppression of the intrinsic impurity coming from outside the plasma is indeed working in the high-density case, while the impurities deposited inside the plasma are kept for a long time.
机译：通过将具有三重示踪剂V（Z = 23），Mn（Z = 25）和Co（Z = 27）的示踪剂包封的固体颗粒（TESPEL）注入大型螺旋装置（LHD）的等离子体中，发现在高密度情况下（通常ne =（5-7）×10〜（19）m〜（-3）），本征杂质的Kα排放被强烈抑制，而所有三个示踪剂的Kα排放均被保留需很长时间。在中等密度的情况下（通常ne =（3-4）×10〜（19）m〜（-3）），可以清楚地观察到本征杂质的Kα排放，而示踪杂质的Kα排放却大大衰减。比高密度情况更快。当在相对低密度的条件下本征杂质通过等离子体聚集阶段中的等离子体外围渗透到等离子体核心中时，则发现这些杂质在高密度条件下在后面的阶段中可以长时间保持。除TESPEL注入外，还通过实施超音速Ar气吹，在中等密度的情况下，可以清楚地观察到ArKα排放以及示踪剂的Kα排放。与此相反，在高密度情况下完全抑制了ArKα的发射。该结果表明，在高密度情况下，抑制来自等离子体外部的本征杂质确实是有效的，而长时间沉积在等离子体内部的杂质。

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