Overview of recent experimental results on MAST-猫眼课题宝

DOI：

10.1088/0029-5515/43/12/012

发表时间：

2003-12

期刊：

Nuclear Fusion

影响因子：

3.3

通讯作者：

中科院分区：

物理与天体物理1区

文献类型：

作者：

B. Lloyd;J. Ahn;R. Akers;L. Appel;E. Arends;K. Axon;R. Buttery;C. Byrom;P. Carolan;C. Challis;D. Ćirić;N. Conway;M. Cox;G. Counsell;G. Cunningham;A. Darke;A. Dnestrovskij;J. Dowling;M. Dunstan;A. Field;S. Fielding;S. Gee;M. Gryaznevich;P. Helander;M. Hole;M. Hood;P. Jones;A. Kirk;I. Lehane;G. Maddison;S. J. Manhood;R. Martín;G. McArdle;K. McClements;M.A McGrath;H. Meyer;A. W. Morris;S.K Nielsen;M. Nightingale;A. Patel;T. Pinfold;M. Price;J. Qin;C. Ribeiro;C. Roach;D. Robinson;O. Sauter;V. Shevchenko;S. Shibaev;K. Stammers;A. Sykes;A. Tabasso;D. Taylor;M. Tournianski;G. Turri;M. Valovic;G. Voss;M. Walsh;S. Warder;J. R. Watkins;H. Wilson;Y. Yang;S. You;the MAST and NBI teams

兆安培球形托卡马克（MAST）的低纵横比允许区分不同形式的H模式阈值缩放。优化燃料使用内侧吹气，和连接的双零偏滤器（DND）的磁配置，H模式的功率阈值数据在于约1.7倍，比最近的比例尺定律。轻微的磁配置的变化，离子拉莫尔半径的顺序，周围的连接DND显着影响H-模式访问。在低频边缘局域模（ELM）放电中的H模约束通常与国际标度律（例如IPB 98（y，2））一致。粒子和能量的内部传输障碍的强烈迹象已经看到。已获得归一化β值βN > 5，接近理想的n = 1无壁外部扭结稳定性极限。锯齿触发的新古典撕裂模式已被观察到，数值模拟的岛屿演变再现模式的行为以及证实稳定场曲率效应的意义。分流器功率负载研究，包括由于ELMs的瞬态效应，显示出一个强大的偏见的功率外流到外侧的目标，它是更容易处理。ELM能量损失Δ WELM在迄今为止探索的所有区域中均小于储存能量的4%，但已测量到延伸到外侧分界线外30 cm的ELM流出。环向非对称偏滤器偏置导致偏置部件上的Dα剖面显著加宽，并使偏置部件的总功率降低。与传统托卡马克相比，晕电流的大小和不对称性一般都很小;最近的测量表明，等离子体的行为更像是一个电压源，而不是电流源。初始中性束电流驱动实验表明非感应驱动电流值（INBI 0.3Ip）与代码预测相当。

The low aspect ratio of the mega amp spherical tokamak (MAST) allows differentiation between different forms of the H-mode threshold scaling. With optimized fuelling using inboard puffing, and a connected double null divertor (DND) magnetic configuration, the H-mode power threshold data lie about 1.7 times higher than recent scaling laws. Slight magnetic configuration changes, of the order of the ion Larmor radius, around a connected DND significantly influence H-mode access. H-mode confinement in discharges with low frequency edge localized modes (ELMs) is generally consistent with international scaling laws, e.g. IPB98(y,2). Strong indications of both particle and energy internal transport barriers have been seen. Normalized beta values βN > 5 have been obtained, approaching the ideal n = 1 no wall external kink stability limit. Sawtooth triggered neo-classical tearing modes have been observed; numerical modelling of the island evolution reproduces mode behaviour well and confirms the significance of stabilizing field curvature effects. Divertor power loading studies, including transient effects due to ELMs, show a strong bias of power efflux to the outboard targets, where it is more easily handled. ELM energy losses, Δ WELM, are less than 4% of the stored energy in all regimes explored so far, but ELM effluxes extending 30 cm outside the outboard separatrix have been measured. Toroidally asymmetric divertor biasing resulted in significant broadening of the Dα profile on the biased components and a reduction in the total power to the unbiased components. Halo current magnitudes and asymmetries are generally small compared with conventional tokamaks; recent measurements show that the plasma behaves more as a voltage source than a current source. Initial neutral beam current drive experiments indicate non-inductively driven current values (INBI ∼ 0.3Ip) comparable with code predictions.

Overview of recent experimental results on MAST

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