Radial transport dynamics studies of SMBI with a newly developed TPSMBI code
Radial transport dynamics studies of SMBI with a newly developed TPSMBI code
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使用新开发的 TSMBI 代码进行 SMBI 径向输运动力学研究
DOI：
10.1088/1674-1056/25/10/106601
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发表时间：
2016
影响因子：
1.7
通讯作者：
Xiang Nong
中科院分区：
文献类型：
--
作者：
Wang Ya-Hui;Guo Wen-Feng;Wang Zhan-Hui;Ren Qi-Long;Sun Ai-Ping;Xu Min;Wang Ai-Ke;Xiang Nong
在托卡马克等离子体加料中，超音速分子束注入（SMBI）技术比传统的吹气加料技术具有更高的加料效率和更深的穿透深度，已被广泛应用于许多托卡马克装置中。研究SMBI的输运动力学对于提高其燃料效率，特别是在高约束区的燃料效率具有重要意义。最近还开发了一个新的一维（1D）程序TPSMBI六场SMBI模型在柱坐标系的基础上。它耦合等离子体密度和热径向输运方程与中性密度输运方程的分子和原子和动量径向输运方程的分子。该模型考虑了等离子体与中性粒子之间的主要粒子碰撞作用，如分子离解、原子电离和电荷交换效应。该代码被验证是正确的分析解决方案，也基准以及与trans-neut模块的BOUT++代码。用TPSMBI程序在平板坐标系和柱坐标系下研究了SMBI过程中随时间变化的径向输运动力学和平均廓线演化。沿着SMBI路径，等离子体密度由于粒子燃料而增加，而等离子体温度由于热冷却而降低。与平板坐标不同，柱坐标模拟SMBI时，曲率效应导致分子和原子的前沿密度增大。
In tokamak plasma fueling, supersonic molecule beam injection (SMBI) with a higher fueling efficiency and a deeper penetration depth than the traditional gas puffing method has been developed and widely applied to many tokamak devices. It is crucial to study the transport dynamics of SMBI to improve its fueling efficiency, especially in the high confinement regime. A new one-dimensional (1D) code of TPSMBI has also been developed recently based on a six-field SMBI model in cylindrical coordinate. It couples plasma density and heat radial transport equations together with neutral density transport equations for both molecules and atoms and momentum radial transport equations for molecules. The dominant particle collisional interactions between plasmas and neutrals, such as molecule dissociation, atom ionization and charge-exchange effects, are included in the model. The code is verified to be correct with analytical solutions and also benchmarked well with the trans-neut module of BOUT++ code. Time-dependent radial transport dynamics and mean profile evolution are studied during SMBI with the TPSMBI code in both slab and cylindrical coordinates. Along the SMBI path, plasma density increases due to particle fuelling, while plasma temperature decreases due to heat cooling. Being different from slab coordinate, the curvature effect leads to larger front densities of molecule and atom during SMBI in cylindrical coordinate simulation.