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Efforts to achieve high-performance long-pulse operations in the EAST

Baonian Wan, EAST Team and Collaborators2016年Plasma Physics and Controlled FusionIF 2.2出版社

To achieve long-pulse tokamak operation, sufficient current drive and self-generated current are required, with the challenges of the exhaust of the heat from the divertor plates. Experiments have proven that lower hybrid current drive (LHCD) can broaden the divertor power footprint and cause the splitting of the strike point current and hence reduce the peak heat flux on the divertors. Edge localized mode (ELM) mitigation can be realized by supersonic molecule beam injection (SMBI), modulated LHCD, lithium granule and aerosol injection, as well as resonant magnetic perturbation (RMP). Enhanced transport by an electrostatic edge coherent mode at the pedestal region is observed in the ELM mitigated plasmas by LHCD. Long-pulse H-mode plasmas in the small ELMy regime have been demonstrated by a combination of ELM mitigation techniques and the optimization of the plasma confinement performance. These newly achieved H-mode scenarios by using features of LHCD in the control of steady-state peak heat flux and transient heat flux due to ELMs may offer a promising regime for further EAST long-pulse high-performance operation and be applicable to ITER.

日本語訳

長パルストカマク運転を達成するためには、十分な電流駆動と自発電流が必要であり、さらにダイバータ板からの熱排気という課題がある。実験により、低域混成波電流駆動(LHCD)がダイバータへの熱負荷分布を広げ、ストライク点電流を分割し、それによってダイバータ上のピーク熱流束を低減できることが実証されている。端部局在モード(ELM)の緩和は、超音速分子ビーム入射(SMBI)、変調LHCD、リチウム顆粒およびエアロゾル入射、ならびに共鳴磁場摂動(RMP)によって実現できる。LHCDによるELM緩和プラズマにおいて、ペデスタル領域での静電的端部モードによる輸送増強が観測されている。小振幅ELM領域での長パルスHモードプラズマは、ELM緩和手法の組み合わせとプラズマ閉じ込め性能の最適化によって実証されている。定常状態のピーク熱流束とELMによる過渡的な熱流束の制御におけるLHCDの特徴を活用して新たに達成されたHモードシナリオは、今後のEASTにおける長パルス高性能運転のための有望な領域を提供し、ITERにも適用可能である。

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