Study of the effect of the pedestal density profiles on the pedestal structure in EAST

作者：Yanjie Yang, K. Li, Tengfei Tang, Xiaoju Liu, Kangning Geng, Gongshun Li, Kedong Li, Xin Lin, Qing Zang, Xiaohe Wu, Haochen Fan, wenjie zhou, Xiang Gao, Guoqiang Li · 发表于：Nuclear Fusion · 年份：2025 · DOI：10.1088/1741-4326/adfd72 · 被引用次数：1 · 研究领域：Magnetic confinement fusion research、Particle accelerators and beam dynamics、Ionosphere and magnetosphere dynamics

Abstract Additional particle control methods, such as gas puffing, may lead to changes in the ratio between the separatrix electron density and the pedestal electron density ( n e sep / n e ped ), and lead to the relative shift between the density and temperature profiles. And the changes in n e sep / n e ped and the relative shift could result in the change of pedestal structure. In this paper, a new version of REPED model has been developed and used to study the effect of density profile on the pedestal structure in EAST. Modeling results show that pedestal pressure has a positive correlation observed with n e sep / n e ped meaning that pedestal pressure height and width increase with the increase of n e sep / n e ped . Study of the relative shift shows that the pedestal pressure increases as the pedestal density shifts inward which also leads to higher pedestal gradient and higher bootstrap current at the pedestal region which is beneficial for the ballooning mode. Analysis by the ELITE code shows that the PBM boundary gradually moves inward as the density shifts outward. Furthermore, the new REPED model is applied to predict the pedestal structure in EAST experiment which has relative density shift, and the predicted pedestal height shows good ...