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Prediction of Alfven eigenmode energetic particle transport in ITER scenarios with a critical gradient model

机译:使用临界梯度模型预测ITER情景中Alfven本征模能量粒子的传输

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摘要

A reduced 1D, local, critical-gradient model of energetic particle (EP) transport by Alfven eigenmodes (AEs)-the TGLF-EP+Alpha model-is applied to a much-studied ITER base case and variations with lower plasma current and lower current penetration. The TGLF-EP+Alpha model is a highly reduced and computationally inexpensive model of EP transport. Such a reduced critical-gradient model, while inapplicable to transport driven by strongly nonlinear or non-local abrupt events, is a valuable tool for scoping studies needed in scenario optimization for ITER and beyond. It relies on the assumption of critical-gradient AE transport with the critical EP density gradient determined by linear AE stability calculations in the TGLF gyro-Landau fluid code automated with the parallel-processed TGLF-EP wrapper. EP transport is treated with simultaneous drive of AEs by fusion-born alpha particles and fast ions born from a MeV neutral beam injection heating. The effect of simultaneous drive creates about 50% increased particle transport in both EP channels. High magnetic safety factor and low shear are generally destabilizing to AEs, but low shear tends to be more important. A tailored q-profile, steady-state-relevant scenario can reduce AE-induced EP redistribution by more than 25% over the ITER base case despite having half the total current.
机译:通过Alfven本征模式(AEs)简化的一维,局部,临界梯度的高能粒子(EP)传输-TGLF-EP + Alpha模型-已应用于经过广泛研究的ITER基本案例以及具有较低等离子体电流和较低波动的变化当前的渗透率。 TGLF-EP + Alpha模型是EP传输的高度简化且计算便宜的模型。这种降低的临界梯度模型虽然不适用于强非线性或非局部突变事件驱动的运输,但却是确定ITER及其它方案优化所需的范围研究的宝贵工具。它依赖于临界梯度AE传输的假设,其中临界EP密度梯度由通过平行处理的TGLF-EP包装器自动执行的TGLF陀螺-朗道流体代码中的线性AE稳定性计算确定的临界EP密度梯度确定。 EP传输通过融合产生的α粒子和MeV中性束注入加热产生的快速离子同时驱动AE来处理。同时驱动的效果使两个EP通道的颗粒传输量增加了约50%。高磁安全系数和低剪切力通常会使AE不稳定,但低剪切力往往更重要。量身定制的,与稳态相关的q曲线情景可以使AE诱发的EP重新分布在ITER基本情况下减少25%以上,尽管总电流只有一半。

著录项

  • 来源
    《Nuclear fusion》 |2020年第1期|016032.1-016032.10|共10页
  • 作者

  • 作者单位

    Univ Calif San Diego 9500 Gilman Dr La Jolla CA 92093 USA;

    Gen Atom POB 85608 San Diego CA 92186 USA;

  • 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

    Alfven eigenmodes; energetic particles; ITER; transport;

    机译:Alfven本征模式高能粒子ITER;运输;

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