The upgrade of experimental advanced superconducting tokamak lower divertor to use tungsten (W) target is undertaken, however the target erosion and W impurity accumulation in the core pose a great challenge during high power discharge with external impurity seeding. This paper aims to study the influence of argon (Ar) seeding on the target erosion and the W impurity transport on steady-state operation. The scrape-off layer/divertor plasma as well as W impurity are self-consistently simulated by using SOLPS-ITER code package. With the constant input power, the Ar seeding rate is varied to study the changes on divertor plasma, incident Ar flux, the target erosion and W impurity transport. The simulation results indicate that the external Ar impurity influences W target erosion through both reducing the plasma temperature and introducing heavier incident particles, which significantly complicates the erosion process. The eroded W flux has great impact on the W core accumulation, and the divertor plasma condition influences W impurity transport remarkably. A correlation between peak electron temperature (T _e) at the outer target and the W concentration (C _W) at the core-edge-interface is found. Moreover, the influence of the W impurity on the background boundary plasma is also evaluated.

实验性先进超导托卡马克下偏滤器升级为使用钨（W）靶材，但靶材侵蚀和芯部W杂质积累对外部杂质引种的高功率放电造成了巨大挑战。本文旨在研究氩 (Ar) 晶种对靶材侵蚀和 W 杂质传输对稳态操作的影响。使用 SOLPS-ITER 代码包对刮除层/偏流器等离子体以及 W 杂质进行自洽模拟。在输入功率恒定的情况下，改变 Ar 种晶率以研究偏滤器等离子体、入射 Ar 通量、靶材侵蚀和 W 杂质传输的变化。模拟结果表明，外部 Ar 杂质通过降低等离子体温度和引入更重的入射粒子来影响 W 靶的腐蚀，这使腐蚀过程显着复杂化。侵蚀 W 通量对 W 核积累有很大影响，偏滤器等离子体条件显着影响 W 杂质输运。峰值电子温度之间的相关性 ( 发现外部目标处的T _e ) 和核心边缘界面处的W 浓度 ( C _W )。此外，还评估了 W 杂质对背景边界等离子体的影响。