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Analysis of the direction of plasma vertical movement during major disruptions in ITER

机译：ITER重大破坏期间血浆垂直运动方向的分析

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The plasma movement in the upward direction (away from the X-point) after the thermal quench (TQ) of major disruptions in ITER is favourable for the machine design, since the downward movement causes larger electromagnetic (EM) load due to the induced eddy and halo currents. Vertical directions of plasma movement after the TQ in ITER are investigated using the predictive mode of the DINA code. Three dominant parameters in determining the direction of plasma movement are identified: (i) the rate of plasma current quench (plasma temperature after the TQ), (ii) the width of plasma current mixing area just after the TQ (change of the internal plasma inductance l(i)) and (iii) the initial vertical position of plasma column before the TQ. It is shown that the reference ITER plasma moves upwards after the TQ, if the electron temperature after the TQ is less than 10eV and the drop of l(i) does not exceed 0.2 for the present reference initial vertical position (55.5 cm above the centre of the machine). It is also shown that the operational domain leading to the upward movement is considerably large for disruptions with fast current quench, which could generate quite severe EM load due to the induced eddy current combined with the induced halo current if the movement is downwards.
机译：在ITER中发生重大破坏的热淬火（TQ）之后，等离子体沿向上方向（远离X点）的运动有利于机器设计，因为向下运动会由于感应涡流而产生较大的电磁（EM）负载和晕圈电流。使用DINA码的预测模式研究了ITER中TQ之后等离子体运动的垂直方向。确定了确定等离子体运动方向的三个主要参数：（i）等离子体电流猝灭的速率（TQ之后的等离子体温度），（ii）刚好在TQ之后的等离子体电流混合区域的宽度（内部等离子体的变化）电感l（i））和（iii）等离子柱在TQ之前的初始垂直位置。结果表明，如果当前参考初始垂直位置（中心上方55.5厘米），如果TQ之后的电子温度低于10eV并且l（i）的降落不超过0.2，则参考ITER等离子体将在TQ之后向上移动。的机器）。还显示出，导致向上运动的操作域对于用快速电流猝灭引起的中断来说是相当大的，如果运动向下，由于感应的涡流与感应的光晕电流相结合，这可能会产生非常严重的EM负载。

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