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Avoidance of disruptions at high βN in ASDEX Upgrade with off-axis ECRH

B. Esposito, G. Granucci, M. Maraschek, S. Nowak, A. Gude, V. Igochine, E. Lazzaro, R. McDermott, E. Poli, J. Stober2011年被引用 25Nuclear FusionIF 3出版社

Experiments on disruption avoidance have been carried out in H-mode ASDEX Upgrade plasmas: the localized perpendicular injection of ECRH (1.5 MW ∼ 0.2Ptot) onto the q = 2 resonant surface has led to the delay and/or complete avoidance of disruptions in a high βN scenario (Ip = 1 MA, Bt = 2.1 T, q95 ∼ 3.6, with NBI ∼7.5 MW). In these discharges (at low q95 and low density) neoclassical tearing modes (NTMs) are excited: the growth and locking of the m/n = 2/1 mode leads to the disruption. The scheme of the experiment is successfully applied in the same way as in previous disruption avoidance experiments in FTU and ASDEX Upgrade. As soon as the disruption precursor signal (the locked mode detector and/or the loop voltage) reaches the preset threshold, the ECRH power is triggered by real-time control. A poloidal scan in deposition location (ρdep) has been carried out by setting the poloidal launching mirrors at different angles in each discharge. The results depend on ρdep: complete disruption avoidance can be achieved when the power is injected close to or onto the 2/1 island. When ECRH is injected outside the island (either at radii inside or outside the q = 2 surface), the discharge is disrupted as in the reference case.

日本語訳

HモードASDEX Upgradeプラズマにおいて、ディスラプション回避の実験が実施された:q = 2共鳴面へのECRH(1.5 MW ∼ 0.2Ptot)の局所的な垂直入射により、高βNシナリオ(Ip = 1 MA、Bt = 2.1 T、q95 ∼ 3.6、NBI ∼7.5 MW)におけるディスラプションの遅延および/または完全回避が達成された。これらの放電(低q95かつ低密度)では、新古典テアリングモード(NTM)が励起される:m/n = 2/1モードの成長とロックがディスラプションを引き起こす。実験の手法は、FTUおよびASDEX Upgradeにおけるこれまでのディスラプション回避実験と同様に適用され、成功を収めた。ディスラプション前駆信号(ロックモード検出器および/またはループ電圧)が設定された閾値に達するとすぐに、ECRHパワーがリアルタイム制御によってトリガーされる。堆積位置(ρdep)のポロイダル走査は、各放電においてポロイダル入射ミラーの角度を変えることによって実施された。結果はρdepに依存する:パワーが2/1島の近傍または内部に入射された場合、完全なディスラプション回避が達成できる。ECRHが島の外部(q = 2面の内側または外側の半径)に入射された場合、放電は参照ケースと同様にディスラプションする。

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asdex-upgrade高精度(タイトル一致)

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ASDEXASDEX UpgradePlasma disruptionElectron cyclotron heating
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