10月20日 Modeling of H-mode EAST edge plasma with impurity seeding by SOLPS-ITER 3.2.0 on wide grid

时间：2025年10月20日 星期一 14:00

地点：六室301会议室

主持人：丁锐

报告人介绍：Ilya Senichenkov，俄罗斯圣彼得堡彼得大帝理工大学副教授，中国科学院国际人才计划（PIFI）国际访问学者，是SOLPS-ITER程序漂移功能及程序加速方案的主要贡献者之一，发表论文40余篇，主要科研领域：托卡马克边界粒子、能量和动量输运；偏滤器物理；弹丸消融和托卡马克加料等。

报告内容： 

In this talk, the recently developed SOLPS-ITER 3.2.0 code is applied to model EAST H-mode impurity seeded shots with full account of drifts and currents, with kinetic treatment of neutrals (by the coupling to Monte-Carlo code Eirene) and on the fully unstructured grid extended up to real in-vessel structures. Thus the complexity of the physical model solved by SOLPS-ITER 3.2.0 on the extended grid reached the typical complexity level of models solved by SOLPS-ITER 3.0.8 on standard grids. The results obtained by SOLPS-ITER 3.2.0 are verified versus the corresponding SOLPS-ITER 3.0.8 cases. For considered shots with Ne and Ar seeding it appears that a big amount of power should be radiated by the impurity in order to reproduce both the absorbed discharge power and outer target profiles. However, the radiated power and corresponding impurity concentration may be reduced if the radial energy flux towards the wall across the B-field increases - physically this corresponds to the convective energy flux towards the main limiter of the EAST machine. On the structured grid (SOLPS-ITER 3.0.8) this energy flux may be controlled by adjusting the parameters of leakage boundary conditions applied on the virtual boundary representing a wall, while an account of toroidally non-symmetric limiter within the approach of an extended unstructured grid (SOLPS-ITER 3.0.8) appears to be not straightforward and might require further code development. However, the account for the limiter opens a way to match the experiments with SOLPS-ITER 3.2.0 too, but the impurity concnentration in the plasma remains not negligible, similarly to SOLPS-ITER 3.0.8.

In the DDN (disconnected double null) topology of EAST discharges the impurity tends to radiate not only from the bottom active divertor,but also from the vicinity of the top inactive X-point. The appearance of this secondary radiating spot is analyzed basing on the modeling results.