Kinetic modeling of high-Z tungsten impurity transport in ITER plasmas using the IMPGYRO code in the trace impurity limit
Kinetic modeling of high-Z tungsten impurity transport in ITER plasmas using the IMPGYRO code in the trace impurity limit
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DOI：
10.1088/1741-4326/aa7fa6
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发表时间：
2017-08
期刊：
影响因子：
3.3
通讯作者：
S. Yamoto;X. Bonnin;Y. Homma;H. Inoue;K. Hoshino;A. Hatayama;R. Pitts
中科院分区：
文献类型：
--
作者：
S. Yamoto;X. Bonnin;Y. Homma;H. Inoue;K. Hoshino;A. Hatayama;R. Pitts
为了更好地理解钨的输运过程，我们正在开发蒙特-卡罗钨输运程序IMPGYRO。该程序具有以下特点，这是重要的计算W输运：（1）精确的拉莫尔运动的W离子的计算，使漂移的影响自动考虑在内;（2）W杂质和背景等离子体离子之间的库仑碰撞模拟使用二元碰撞模型，提供更精确的动力学计算的摩擦力和热力学。利用IMPGYRO程序，计算了不考虑漂移影响的SOLPS-ITER偏滤器在两种不同运行模式（A：部分分离状态和B：高再循环状态）下的W产生/输运。上游SOL（刮除层）中的W密度的结果强烈地依赖于偏滤器的操作模式。从比较的情况A和情况B之间的W杂质的传输，获得部分脱离状态被证明是有效的，以减少W杂质在上游SOL。讨论了所采用模型的局限性和上述结果的有效性，并对IMPGYRO程序在ITER等离子体中进一步应用的问题进行了总结。
In order to obtain a better understanding of tungsten (W) transport processes, we are developing the Monte-Carlo W transport code IMPGYRO. The code has the following characteristics which are important for calculating W transport: (1) the exact Larmor motion of W ions is computed so that the effects of drifts are automatically taken into account; (2) Coulomb collisions between W impurities and background plasma ions are modelled using the Binary Collision Model which provides more precise kinetic calculations of the friction and thermal forces. By using the IMPGYRO code, the W production/transport in the ITER geometry has been calculated under two different divertor operation modes (Case A: partially detached state and Case B: high recycling state) obtained from the SOLPS-ITER code suite calculation without the effect of drifts. The results of the W-density in the upstream SOL (scrape-off layer) strongly depend on the divertor operation mode. From the comparison of the W impurity transport between Case A and Case B, obtaining a partially detached state is shown to be effective to reduce W-impurities in the upstream SOL. The limitations of the employed model and the validity of the above results are discussed and future problems are summarized for further applications of IMPGYRO code to ITER plasmas.