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The impact of the ITER-like wall at JET on disruptions

P C de Vries, G Arnoux, A Huber, J Flanagan, M Lehnen, V Riccardo, C Reux, S Jachmich, C Lowry, G Calabro2012年Plasma Physics and Controlled FusionIF 2.2出版社

The new full-metal ITER-like wall (ILW) at JET was found to have a profound impact on the physics of disruptions. The main difference is a significantly lower fraction (by up to a factor of 5) of energy radiated during the disruption process, yielding higher plasma temperatures after the thermal quench and thus longer current quench times. Thus, a larger fraction of the total energy was conducted to the wall resulting in larger heat loads. Active mitigation by means of massive gas injection became a necessity to avoid beryllium melting already at moderate levels of thermal and magnetic energy (i.e. already at plasma currents of 2 MA). A slower current quench, however, reduced the risk of runaway generation. Another beneficial effect of the ILW is that disruptions have a negligible impact on the formation and performance of the subsequent discharge.

日本語訳

JETにおける新型ITER類似壁(ILW)は、ディスラプションの物理に大きな影響を与えることが判明した。主な違いは、ディスラプション過程において放射されるエネルギーの割合が大幅に低いこと(最大5倍の差)であり、これにより熱クエンチ後のプラズマ温度が高くなり、結果として電流クエンチ時間が長くなる。したがって、全エネルギーのより大きな割合が壁に伝導され、より大きな熱負荷をもたらす。大量ガス入射による能動的緩和は、熱的・磁気的エネルギーが中程度のレベル(すなわちプラズマ電流2 MA)ですでにベリリウムの溶融を回避するために必須となった。しかし、電流クエンチが遅くなることで、逃走電子の生成リスクは低減された。ILWのもう一つの利点は、ディスラプションがその後の放電の形成と性能に与える影響が無視できるほど小さいことである。

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iter高精度(タイトル一致)jet高精度(タイトル一致)

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ITERJETPlasma disruptionITER-like wall
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