边界局域模条件下托卡马克偏滤器靶板附近等离子体输运的数值研究

项目名称： 边界局域模条件下托卡马克偏滤器靶板附近等离子体输运的数值研究

项目编号： No.11475223

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 数理科学和化学

项目作者： 欧靖

作者单位： 中国科学院合肥物质科学研究院

项目金额： 45万元

中文摘要： 边界局域模爆发的时候会引起器壁材料的热负载和粒子溅射瞬时增强，研究边界局域模条件下托卡马克偏滤器靶板附近等离子体的输运对延长器壁材料寿命和提高主约束区等离子体性能有着重要意义。该项目拟用等离子体流体模型与中性粒子Monte-Carlo相耦合的大型边界输运程序包SOLPS为主要工具，研究在不同磁场拓扑结构（单零、双零、近双零）下，边界局域模爆发时偏滤器靶板的能量沉积和能流分布。同时利用等离子体粒子模拟软件VORPAL，研究包含高能量粒子的鞘层结构，分析离子进入鞘层的速度和鞘层的能量穿透系数，修正边界局域模条件下边界输运模型在偏滤器靶板处所采用的边界条件并应用到SOLPS程序中。然后使用SOLPS程序预测高功率加热下EAST装置爆发边界局域模时偏滤器靶板的能量沉积和能流分布的空间特性，为ITER长脉冲放电偏滤器优化和今后反应堆的偏滤器设计提供参考。

中文关键词： 等离子体输运；边界局域模；偏滤器区域；等离子体鞘层；数值模拟

英文摘要： Based on the transient enhanced energy deposition of plasma facing component and particle sputtering during edge localized modes (ELMs), understanding plasma transport near the divertor plate in a tokamak has been of significance for the extension of materials lifetime and improvement of core plasma confinement. In this projection, the package SOLPS coupling the multi-fluid plasma model with the Monte-Carlo neutral model is used to investigate the divertor energy depositon and heat flux pofiles during ELMs in different magnetic topologies including single-null, double-null and connected double-null. The properties of plasma sheath containing energetic particles is also examined by the plasma particle-in-cell(PIC) software VORPAL. The boundaries conditions of the divertor plates for the plasma transport models are modified by ions velocity entering the sheath and sheath power transmission coefficients during ELMs modeling, and they are applied to SOLPS code.Then, the spatial characteristics of the divertor energy deposition and heat flux profiles are predicted by SOLPS code during ELMs for the high power input in EAST. The simulation results provide references for the optimized divertor designs for ITER and divertor designs for next reactor.

英文关键词： plasma transport;edge localized modes;divertor region;plasma sheath;numerical simulation