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Real-time control of internal transport barriers in JET

机译：JET内部运输障碍的实时控制

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We present the results of recent experiments related to real-time control of internal transport barriers (ITBs) in JET. Using a simple criterion to characterize the ITB existence, location and strength, we have successfully controlled for the first time the radial electron temperature profile within the ITB. The dimensionless variable used in the real-time algorithm-ratio of the ion gyroradius to the local gradient scale length of the electron temperature-is a measure of the normalized electron temperature gradient and characterizes satisfactorily the main ITB features with a relatively low computational cost. We show several examples of control of this variable in various experimental conditions of toroidal field and plasma current, using different heating systems as control actuators. We also present a double-loop feedback scheme where both the global neutron rate from D-D reactions and the ITB strength are controlled simultaneously. In this case the ITB is sustained in a fully noninductive current drive regime during several seconds. With the proposed control method, disruptions are avoided by holding the plasma performance at a prescribed target and this opens the route towards stationary operation of tokamak plasmas with ITBs. Initial results suggest that the additional control of the current profile is an important issue for achieving steady-state operation, in particular in the triggering and the sustainment of the ITB. [References: 27]
机译：我们介绍了有关JET内部运输障碍（ITB）实时控制的最新实验结果。使用一个简单的标准来表征ITB的存在，位置和强度，我们首次成功地控制了ITB中的径向电子温度分布。实时算法中使用的无量纲变量-离子陀螺半径与电子温度的局部梯度标度长度之比-是归一化电子温度梯度的量度，并以较低的计算成本令人满意地表征了主要ITB特征。我们展示了使用不同的加热系统作为控制执行器，在环形场和等离子体电流的各种实验条件下控制此变量的几个示例。我们还提出了一种双回路反馈方案，其中同时控制D-D反应的整体中子速率和ITB强度。在这种情况下，ITB会在几秒钟内维持在完全无感的电流驱动状态。利用所提出的控制方法，通过将等离子体性能保持在规定的目标来避免干扰，这开辟了通向具有ITB的托卡马克等离子体平稳运行的途径。初步结果表明，对电流曲线的额外控制是实现稳态操作的重要问题，尤其是在触发和维持ITB方面。 [参考：27]

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