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Integrated modeling of ASDEX Upgrade plasmas combining core, pedestal and scrape-off layer physics

机译：结合核心，基座和刮除层物理原理的ASDEX升级等离子体的集成建模

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摘要

The design of future fusion reactors and their operational scenarios requires an accurate prediction of the plasma confinement. We have developed a new model that integrates different elements describing the main physics phenomena which determine plasma confinement. In particular, we are coupling a new pedestal transport model, based on empirical observations, to the ASTRA transport code, which, together with the TGLF turbulent transport model and the NCLASS neoclassical transport model, allows us to describe transport from the magnetic axis to the separatrix. We also coupled a simple scrape-off layer model to ASTRA, which provides the boundary conditions at the separatrix, which are a function of the main engineering parameters. By this way no experimental data of the kinetic profiles is needed, and the only inputs of the model are the magnetic field, the plasma current, the heating power, the fueling rate, the seeding rate, the plasma boundary, and the effective charge. In the modeling work-flow, first a scan in pedestal pressure is performed, by changing the pedestal width. Then the pedestal top pressure is determined using the MISHKA MHD stability code. This modeling framework is tested by simulating ASDEX Upgrade discharges. We show comparisons with experimental fueling, power, and current scans. The changes of the pedestal structure and the gradients in the plasma core, due to the different combinations of fueling, heating power, and plasma current, are well captured by the model. We also show that the predicted pedestal and global stored energies are in good agreement with the experimental measurements, and more accurate with respect to the prediction of the IPB98(y,2) scaling law. The long term goal is to obtain a robust and complete model which can be used to identify important hidden dependencies affecting global plasma confinement, which are difficult to capture by statistical regressions on global parameters.
机译：未来聚变反应堆的设计及其运行方案需要对等离子体约束进行准确的预测。我们开发了一个新模型，该模型整合了描述决定等离子体限制的主要物理现象的不同元素。特别是，我们正在根据经验观察将新的基座运输模型与ASTRA运输代码相结合，该代码与TGLF湍流运输模型和NCLASS新古典运输模型一起，使我们能够描述从磁轴到磁浮子的运输。分离我们还将简单的刮除层模型与ASTRA耦合，该模型提供了分离线的边界条件，该边界条件是主要工程参数的函数。通过这种方式，不需要动力学曲线的实验数据，并且模型的唯一输入是磁场，等离子体电流，加热功率，加油速率，注入速率，等离子体边界和有效电荷。在建模工作流程中，首先通过更改基座宽度来执行基座压力扫描。然后，使用MISHKA MHD稳定性代码确定基座最高压力。通过模拟ASDEX升级排放来测试此建模框架。我们展示了与实验加油，功率和电流扫描的比较。该模型可以很好地捕获由于加油，加热功率和等离子流的不同组合而导致的等离子芯基座结构和梯度的变化。我们还表明，预测的基座和全局存储的能量与实验测量值非常吻合，并且相对于IPB98（y，2）缩放定律的预测更为准确。长期目标是获得一个健壮和完整的模型，该模型可用于识别影响全局血浆限制的重要隐藏依赖关系，而这些依赖关系很难通过全局参数的统计回归来捕获。

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  • 来源
    《Nuclear fusion》 |2020年第3期|036023 (21pp).1-036023 (21pp).21|共21页
  • 作者

  • 作者单位

    Max-Planck-Institut fur Plasmaphysik Boltzmannstrasse 2 D-85748 Garching Germany Aix-Marseille Universite CNRS PIIM UMR 7345 13397 Marseille France;

    Max-Planck-Institut fur Plasmaphysik Boltzmannstrasse 2 D-85748 Garching Germany;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    integrated modeling; pedestal; confinement;

    机译：集成建模;座;禁闭;

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