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Testing predictions of electron scale turbulent pedestal transport in two DⅢ-D ELMy H-modes

机译：两种DⅢ-D Elmy H模式中电子级湍流基座输送的测试预测

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摘要

In this paper, we present linear and nonlinear gyrokinetic analyses in the pedestal region of two DⅢ-D ELMy H-mode discharges using the CGYRO code. The otherwise matched discharges employ different divertor configurations to investigate the impact of varying recycling and particle source on pedestal profiles. Linear gyrokinetic simulations find electrostatic ion-scale instabilities (ion temperature gradient and trapped electron modes, ITG-TEM) are present just inside the top of the pedestal with growth rates that are enhanced significantly by parallel velocity shear. In the sharp gradient region, E × B shearing rates are comparable or larger than ion scale growth rates, suggesting the suppression of ITG-TEM modes in this region. Instead, the electron temperature profiles are found to be correlated with and just above the electron temperature gradient (ETG) instability thresholds. Using gradients varied within experimental uncertainties, nonlinear electron-scale gyrokinetic simulations predict electron heat fluxes from ETG turbulence, that when added to neoclassical (NC) ion thermal transport simulated by NEO, account for 30%-60% of the total experimental heat flux. In addition, the NC electron particle flux is found to contribute significantly to the experimental fluxes inferred from SOLPS-ITER analysis. Additional nonlinear gyrokinetic simulations are run varying input gradients to develop a threshold-based reduced model for ETG transport, finding a relatively simple dependence on η_e = L_(ne)/L_(Te). Predictive transport simulations are used to validate this pedestal-specific ETG model, in conjunction with a model for NC particle transport. In both discharges, the predicted electron temperatures are always overpredicted, indicative of the insufficient stiffness in the ETG pedestal model to account for all of the experimental electron thermal transport. In the case of the closed divertor discharge with lower particle source, the predicted electron density is close to the experiment, consistent with the magnitude of NC particle transport in that discharge. However, the density profiles are overpredicted in the open divertor discharge (larger particle source), due to insufficient model transport. The implications for other mechanisms accounting for the remainder of transport in the sharp gradient region in the two discharges are discussed.
机译：在本文中，我们使用CYGRO CODE呈现两个DⅢ-D ELMY H模式排放的基座区域的线性和非线性旋转分析。惯例匹配的放电采用不同的偏移器配置，以研究变化的回收和粒子源对基座轮廓的影响。线性陀螺模拟发现静电离子尺度不稳定性（离子温度梯度和被困电子模式，ITG-TEM）仅在基座顶部内部，通过并联速度剪切显着增强的生长速率。在尖锐梯度区域中，E×B剪切速率比离子尺度生长速率相当或大，表明该区域中的ITG-TEM模式抑制。相反，发现电子温度曲线与电子温度梯度（ETG）不稳定性阈值相关。在实验不确定性内使用梯度变化，非线性电子级热因子模拟预测ETG湍流的电子热量，即当添加到Neo模拟的新古典（NC）离子热传输时，占实验总热通量的30％-60％。此外，发现NC电子颗粒通量显着贡献到从Solps-Iter分析推断的实验助熔剂。额外的非线性旋转内模拟是运行不同的输入渐变，以开发基于阈值的eDG传输的减少模型，找到对η_e= l_（ne）/ l_（te）的相对简单的依赖性。预测传输模拟用于验证该基座特定的ETG模型，与NC粒子传输的模型结合。在所有放电中，预测的电子温度始终呈现，指示ETG基座模型中不足的刚度，以考虑所有实验电子热传输。在具有下粒子源的闭合转移器放电的情况下，预测的电子密度接近实验，与该放电中的NC颗粒输送的大小一致。然而，由于模型运输不足，密度型材在开放式转移器放电（较大的粒子源）中呈现。讨论了对两个放电中尖锐梯度区域中剩余的运输剩余传输的其他机制的影响。

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  • 来源
    《Nuclear fusion》 |2021年第5期|056005.1-056005.14|共14页
  • 作者

    W. Guttenfelder; R.J. Groebner; J.M. Canik; B.A. Grierson; E.A. Belli; J. Candy;

  • 作者单位

    Princeton Plasma Physics Laboratory Princeton University Princeton NJ 08543 United States of America;

    General Atomics San Diego CA 92186 United States of America;

    Oak Ridge National Laboratory Oak Ridge TN 37831 United States of America;

    Princeton Plasma Physics Laboratory Princeton University Princeton NJ 08543 United States of America;

    General Atomics San Diego CA 92186 United States of America;

    General Atomics San Diego CA 92186 United States of America;

  • 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

    pedestal transport; gyrokinetic simulations; validation; ETG pedestal transport model;

    机译：基座运输;旋转模拟;验证;ETG基座运输模型;

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