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首页> 外文期刊>Fusion Engineering and Design >Electromagnetic FEM studies of disruptions and engineering consequences for the power supply and coils design of planned upper divertor at ASDEX Upgrade
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Electromagnetic FEM studies of disruptions and engineering consequences for the power supply and coils design of planned upper divertor at ASDEX Upgrade

机译：在ASDEX升级中对计划的上部分流器的电源和线圈设计的中断和工程后果进行电磁FEM研究

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A new upper divertor is proposed for the ASDEX Upgrade (AUG) tokamak experiment. It is planned to be equipped with internal coils for investigation of alternative magnetic configurations like e.g. "snowflake" (Herrmann et al., 2017 [1]). Since the coils are close to the plasma, high induced and very stiff voltages are expected during disruption events. Because only very vague analytical estimates of voltages, forces and coupling factors were available, an improvement by the help of Finite Element Method (FEM) was envisaged. Therefore, recorded measurements of currents, plasma position, plasma profile and the geometry were integrated in an electromagnetic simulation as boundary conditions to calculate resulting field distributions during selected AUG disruptions. The time resolution can be better than 100 mu s and the required computing resources are comparably small due to the assumption of 2D axis-symmetry. The results were compared with magnetic probe measurements integrated into the tokamak ultimately observing good agreement. After this, the FE model was modified including the new divertor to calculate all relevant parameters. The output of these calculations has strong implications for the coil and power supply design: i) The power supply will be protected by a new kind of crowbar to avoid damage of the power supply due to overvoltage and uncontrolled current and force rise of the coils. The concept of this so called "ripping crowbar" is introduced, which is now under development. ii) The coil cable should be coaxial shaped to monitor isolation faults and to become inherently safe against single-turn shortcuts, identified as destructive fault scenario.
机译：建议为ASDEX升级（AUG）托卡马克实验使用新的上偏滤器。计划配备内部线圈，以研究其他磁性配置，例如： “雪花”（Herrmann等人，2017 [1]）。由于线圈靠近等离子体，因此在中断过程中会产生很高的感应电压和非常坚硬的电压。由于只能获得非常模糊的电压，力和耦合因子的分析估计，因此可以设想通过有限元方法（FEM）进行改进。因此，在电磁仿真中将记录的电流，等离子体位置，等离子体轮廓和几何形状的测量结果作为边界条件进行积分，以计算在选定的AUG中断过程中产生的场分布。由于采用了2D轴对称性，因此时间分辨率可以优于100μs，并且所需的计算资源相对较小。将结果与集成到托卡马克中的磁探针测量结果进行了比较，最终观察到很好的一致性。此后，FE模型进行了修改，包括新的偏滤器，以计算所有相关参数。这些计算的输出对线圈和电源设计有重要影响：i）电源将受到新型撬棍的保护，以避免由于过电压，不受控制的电流和线圈的力上升而损坏电源。引入了这种所谓的“撬棍”的概念，该概念目前正在开发中。 ii）线圈电缆应为同轴电缆形状，以监视隔离故障并在本质上免受单匝捷径（被认为是破坏性故障情况）的安全。

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