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Tearing mode physics studies applying the dynamic ergodic divertor on TEXTOR

机译：在TEXTOR上应用动态遍历偏滤器的模式物理研究

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摘要

The dynamic ergodic divertor (DED) on the TEXTOR tokamak allows for the reproducible destabilization of the m = 2/1 tearing mode which is phase locked to the external static or rotating perturbation field. In combination with its flexible heating systems (co- and counter-neutral beam injection, ion cyclotron resonance heating, electron cyclotron resonance heating (ECRH) with steerable launcher) dedicated experiments to study the mode onset, properties of large islands and mode stabilization can be performed. The dependence of the mode excitation threshold (field penetration) on the plasma rotation shows a resonance character, with minimum threshold when the external perturbation frequency matches the MHD frequency of the 2/1 mode. Mode stabilization by ECRH heating shows that for the TEXTOR plasma heating is more effective than the current drive in O-point. Extrapolation to ITER yields a significant contribution to the mode suppression originating from the temperature increase within the island. Alfven-like modes, which have been previously identified in the vicinity of large islands on FTU (Buratti et al 2005 Nuclear Fusion 45 1446), are found to be created already before island formation above a certain threshold of the externally applied perturbation field.
机译：TEXTOR托卡马克上的动态遍历偏滤器（DED）允许m / n = 2/1撕裂模式的可再现去稳定化，该模式被锁相到外部静态或旋转扰动场。结合其灵活的加热系统（共中和反中性束注入，离子回旋共振加热，带可操纵发射器的电子回旋共振加热（ECRH）），可以进行专门的实验来研究模式的开始，大岛的性质和模式的稳定性。执行。模式激发阈值（场穿透）对等离子旋转的依赖性显示出共振特性，当外部扰动频率与2/1模式的MHD频率匹配时，阈值最小。通过ECRH加热进行的模式稳定表明，对于TEXTOR，等离子体加热比O点上的电流驱动更有效。对ITER的外推对岛内温度升高引起的模式抑制产生重大贡献。以前在FTU上的大岛附近已经发现了类似Alfven的模式（Buratti等，2005核聚变45 1446），发现是在岛形成超过外部施加的扰动场的某个阈值之前就已经创建的。

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