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Compatibility of reduced activation ferritic steel wall with high performance plasma on JFT-2M

K. Tsuzuki, K. Kamiya, K. Shinohara, M. Bakhtiari, H. Ogawa, G. Kurita, M. Takechi, S. Kasai, M. Sato, H. Kawashima2006年被引用 17Nuclear FusionIF 3出版社

In JFT-2M, the applicability of reduced activation ferritic steel to a fusion demonstration reactor has been demonstrated mainly concerning the ferromagnetic effect on plasma production, control, stability and confinement. The compatibility of the close ferritic wall with high-normalized beta plasmas has been investigated mainly because the demonstration reactor will utilize the wall stabilization effect. Due to improvements in the operation scenario and the modification of the guard limiter configuration, the region showing good compatibility was extended to the closer wall position (the wall position was normalized to the plasma minor radius; rwall/a∼ 1.25) and the higher normalized beta (βN ∼ 3.5), compared with the previous works with the relatively far wall position and stronger magnetic field (Tsuzuki K. et al2003 Nucl. Fusion. 43 1288). A reduction in the growth rate of the instability was also observed in the close wall case, which presumably corresponds to the wall stabilization effect, similar to a resistive wall without ferromagnetism.

日本語訳

JFT-2Mにおいて、低放射化フェライト鋼の核融合実証炉への適用可能性が、主にプラズマ生成、閉じ込め、安定性に対する強磁性効果に関して実証された。密接フェライト壁と高規格化ベータプラズマとの両立性が、主に実証炉が壁安定化効果を利用するために調査された。運転シナリオの改善とガードリミター形状の修正により、両立性が良好な領域は、より近接した壁位置(壁位置はプラズマ小半径で規格化;r/a∼1.25)およびより高い規格化ベータ(βN∼3.5)まで拡張された。これは、比較的遠い壁位置とより強い磁場を用いた先行研究(Tsuzuki K. et al2003 Nucl. Fusion. 43 1288)と比較しての成果である。密接壁の場合には不安定性の成長率の低減も観測され、これはおそらく、強磁性を有さない抵抗性壁と同様の壁安定化効果に対応するものと考えられる。

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Reduced activation ferritic/martensitic steelJFT-2MFerritic steel
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