• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Plasma physics and controlled fusion >Anomalous impurity transport: charge-state diffusion due to atomic processes in tokamak plasmas
【24h】

Anomalous impurity transport: charge-state diffusion due to atomic processes in tokamak plasmas

机译：异常杂质传输：由于托卡马克等离子体中的原子过程而导致的电荷态扩散

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

A new interpretation of anomalous impurity transport in tokamak plasmas is presented. An alternative (compared with conventional) approach reveals the relative importance of the transport of impurity particles and the diffusion of impurity charge states due to ionization and recombination processes. The set of coupled transport equations is reduced to a novel kinetic equation which is analysed in terms of charge-state transport including both the transport of particles and charge-state diffusion due to atomic processes. From the analysis of this equation and from available spectroscopic data the relationship between diffusion coefficients of these types of transport is found. It is concluded that charge-state diffusion exceeds the radial diffusion of particles significantly. Hence, the conventional empirical coefficients of anomalous diffusion D-A and convective velocity V-A mainly model charge-state diffusion rather than radial transport of impurity particles. A simple model is developed to describe the diffusion of impurity charge states with ionization rates enhanced by non-thermal effects of electron energy distribution and with recombination rates dominated by charge exchange of impurities on hydrogen atoms. The model is tested by comparing the simulated and measured radial profiles of line emission from oxygen, scandium and iron impurities taken from the TFR and PLT tokamaks. The radial profiles of neutrals and of superthermal electrons are obtained by modelling of spectroscopic data instead of the conventional empirical coefficients D-A and V-A. [References: 52]
机译：提出了对托卡马克等离子体中异常杂质传输的新解释。一种替代方法（与常规方法相比）揭示了由于电离和复合过程而导致的杂质颗粒传输和杂质电荷态扩散的相对重要性。这组耦合的传输方程式简化为一个新颖的动力学方程式，该方程式在电荷态传输方面进行了分析，包括粒子的传输和由于原子过程引起的电荷态扩散。通过对该方程的分析和可用的光谱数据，可以发现这些类型的传输的扩散系数之间的关系。可以得出结论，电荷态扩散明显超过了粒子的径向扩散。因此，常规的反常扩散经验D-A和对流速度V-A主要模拟电荷状态扩散，而不是杂质粒子的径向传输。建立了一个简单的模型来描述杂质电荷状态的扩散，其中电离速率通过电子能量分布的非热效应增强，电离速率以氢原子上杂质交换电荷为主的重组速率来描述。通过比较从TFR和PLT托卡马克获得的氧，scan和铁杂质的线发射的模拟和测量的径向分布图，对模型进行了测试。中子和过热电子的径向分布是通过对光谱数据进行建模而不是常规的经验系数D-A和V-A来获得的。 [参考：52]

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