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Energetic ion losses 'channeling' mechanism and strategy for mitigation

机译:精力充沛的离子损失“渠道”机制与缓解策略

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摘要

Results from two different sets of JET experiments are presented. In experiments in which toroidicity-induced Alfven eigenmodes (TAEs) localized at different radial locations had the same frequencies and toroidal mode numbers, the occurrence of enhanced losses after the excitation of TAEs in the core of the plasma was observed. On the contrary, enhanced losses were not observed if the TAEs localized at different radial locations had different frequencies and toroidal mode numbers. Numerical modeling indicates that, in the first set of experiments, the enhanced losses were caused by a combined effect of the TAEs localized at different radial locations. The TAEs localized in the plasma core transported energetic ions from the core to outer regions of the plasma. Then, the TAEs localized in outer regions of the plasma interacted with these ions just transported by the core-localized TAEs causing a further radial displacement of the ions to the plasma edge. This process eventually ends up causing the loss of the resonant ions. In the second set of experiments, it was found that TAEs localized in the plasma core and in outer regions did not interact with the same ions and so no enhanced losses were measured. Sheared profiles of the safety factor combined with flat mass density profiles lead to larger differences on the frequencies of the TAEs localized at different radial locations, eventually avoiding loss of energetic ions through the described mechanism.
机译:提出了两组不同的喷射实验结果。在实验中,在不同径向位置定位的环形性诱导的Alfven特征模码(TAE)具有相同的频率和环形模式数,观察到在等离子体的核心激发之后发生增强损失的发生。相反,如果在不同径向位置定位的TAE具有不同的频率和环形模式编号,则未观察到增强的损耗。数值建模表明,在第一组实验中,增强损耗是由在不同径向位置处定位的TAE的组合效应引起的。在等离子体芯中定位的TAE从核心传送到等离子体的外部区域的能量离子。然后,在等离子体的外部区域中定位的TAE与刚刚由核心定位的TAE运输的这些离子相互作用,导致离子进一步径向位移到等离子体边缘。该过程最终最终导致谐振离子的损失。在第二组实验中,发现在等离子体芯和外部区域局部定位的TAE没有与相同的离子相互作用,因此没有测量增强的损耗。与扁平质量密度分布组合的安全系数的剪切轮廓导致在不同径向位置定位的TAE的频率的差异较大,最终通过所描述的机制避免了能量离子的损失。

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