...
首页> 外文期刊>Journal of the Physical Society of Japan >Model for pedestal transport based on suppression of anomalous transport using ω _(E × B) flow shear and magnetic shear
【24h】

Model for pedestal transport based on suppression of anomalous transport using ω _(E × B) flow shear and magnetic shear

机译:基于ω_(E×B)流动剪切和磁剪切抑制异常传输的基座传输模型

获取原文
获取原文并翻译 | 示例
           

摘要

A model for describing a pedestal transport in H-mode tokamak plasmas is developed and tested in BALDUR integrated predictive modelling code. The transport model is calculated based on the suppression of an anomalous core transport due to the ω _(E × B) flow shear and magnetic shear. Because of the reduction of transport in the edge region, the pedestal can be formed and evolved. In this work, an anomalous transport is computed using a semi-empirical mixed Bohm/gyro-Bohm anomalous core transport model. The BALDUR code with both core and pedestal transport is used to simulate the time evolution of plasma current, ion and electron temperature, and particle and impurity density profiles for 10 DIII-D H-mode discharges in various plasma scenarios (i.e., gyro-radius scan, density scan, power scan, and elongation scan). It is found that the formation of the pedestal can be observed in all simulations, in which the L-H transition in the simulations is consistent with the L-H transition power threshold model. Moreover, both values at the top of the pedestal and the pedestal width for ion and electron temperatures and particle and impurity densities are all in the ranges expected for the experimental data and agree with the existing pedestal scalings. To quantify the agreement between the simulated core-edge profiles and the corresponding experiment, several statistical analysis techniques, including RMS and offset, are carried out. It is found that the simulated profiles yield an agreement with experimental data in the range from 7.45 to 17.39% for density and temperature, respectively, which is slightly worse than those using experimental data at the top of the pedestal as boundary conditions in BALDUR code. In addition, a cross comparison technique is used to confirm the predictive capability of the model by using a comparison with 12 JET H-mode discharges. It shows that the predicted plasma profiles yield satisfactory agreement.
机译:在BALDUR集成预测建模代码中开发并测试了用于描述H模式托卡马克等离子体中的基架传输的模型。输运模型的计算基于对由于ω_(E×B)流动剪切和磁剪切引起的异常岩心输送的抑制。由于边缘区域中运输的减少,因此可以形成和演化基座。在这项工作中,使用半经验混合的Bohm / gyro-Bohm异常核心传输模型计算了异常传输。具有核心和基座传输的BALDUR代码用于模拟等离子体电流(即陀螺半径)中10 DIII-D H模式放电的等离子体电流,离子和电子温度以及颗粒和杂质密度分布的时间演化扫描,密度扫描,功率扫描和伸长率扫描)。发现在所有模拟中都可以观察到基座的形成,其中模拟中的L-H跃迁与L-H跃迁功率阈值模型一致。此外,离子和电子温度以及颗粒和杂质密度的基座顶部和基座宽度的值均在实验数据预期的范围内,并且与现有的基座比例一致。为了量化模拟的核心边缘轮廓与相应实验之间的一致性,已进行了几种统计分析技术,包括RMS和偏移。结果发现,模拟轮廓在密度和温度方面与实验数据的一致性分别在7.45%至17.39%之间,这比在BALDUR代码中将基座顶部的实验数据用作边界条件的情况稍差一些。另外,交叉比较技术用于通过与12个JET H模式放电进行比较来确认模型的预测能力。结果表明,预测的血浆分布图令人满意。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号