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Large-amplitude oscillations of soft X-rays in a high current density plasma on TPE-1RM15 reversed field pinch

T Shimada, Y Yagi, K Hattori, Y Hirano, I Hirota, Y Maejima, K Ogawa, K Saito, S Shiina1994年Plasma Physics and Controlled FusionIF 2.2出版社

In the high current density plasma on TPE-1RM15 reversed field pinch, large-amplitude oscillations with m=0, n=0 are observed in soft X-ray (SXR) emission for a wide range of theta values, even at low- theta ( theta <1.55) discharges. Another small-amplitude oscillation with m=1 is observed quasicontinuously for almost all the discharge. The burst of high-energy soft X-rays is observed in the channels of the SBD array looking at the electron drift side of a metal limiter and seems to correlate with the crash of the large-amplitude oscillation. This SXR burst indicates the existence of energetic electrons flowing along the field lines near the plasma surface in the dynamo phase. These large-amplitude SXR oscillations are mainly due to the variations in the electron temperature and are roughly in antiphase with the oscillation of ion temperature.

日本語訳

TPE-1RM15逆転磁場ピンチにおける高電流密度プラズマ中で、m=0、n=0の大振幅振動が軟X線(SXR)放射において、広いシータ値の範囲で観測された。低シータ値(シータ<1.55)の放電においても同様である。m=1の小振幅振動は、ほぼ全放電期間にわたって準連続的に観測された。高エネルギー軟X線のバーストは、金属リミターの電子ドリフト側を観測するSBDアレイのチャンネルで観測され、大振幅振動のクラッシュと相関しているように見える。このSXRバーストは、ダイナモ位相におけるプラズマ表面近傍の磁力線に沿った高エネルギー電子の存在を示している。これらの大振幅SXR振動は主に電子温度の変動によるものであり、イオン温度の振動とほぼ逆位相である。

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Reversed field pinchSoft x-ray
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