The transport of impurities supplied by a multi‐species impurity powder dropper (IPD) in the large helical device (LHD) is investigated using a three‐dimensional peripheral plasma fluid code (EMC3‐EIRENE) coupled with a dust transport simulation code (DUSTT). The trajectories of impurity powder particles (Boron, Carbon, Iron, and Tungsten) dropped from the IPD and the impurity transport in the peripheral plasma are studied in a full‐torus geometry. The simulation reveals an appropriate size of the impurity powder particles and an optimum operational range of the dust drop rates for investigating the impurity transport without inducing radiation collapse. The simulation also predicts a favourable plasma discharge condition for wall conditioning (boronization) using the IPD in order to deposit boron to high plasma flux and neutral particle density areas in the divertor region in the inboard side of the torus.

中文翻译：

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大型螺旋装置中使用多种类杂质粉末滴管的全环形杂质传输模拟，以优化等离子体放电操作

使用三维外围等离子体流体代码（EMC3-EIRENE）结合粉尘迁移模拟代码（DUSTT），研究了由多种杂质粉末滴管（IPD）在大型螺旋设备（LHD）中提供的杂质的传输。 。从IPD滴落的杂质粉末颗粒（硼，碳，铁和钨）的轨迹和全等离子体几何学研究了外围等离子体中的杂质迁移。该模拟揭示了合适的杂质粉末颗粒尺寸和粉尘掉落率的最佳操作范围，用于研究杂质的传输而不会引起辐射崩溃。