文献类型：期刊文献

英文题名：Gyrokinetic simulation of the effects of fast ions and impurities on turbulent transport in CFETR hybrid scenario

作者：Tang, Ruzhi[1];Zhang, Debing[1];Yu, Limin[1];Ye, Lei[2,3];Wang, Guoxu[2,3];Zhang, Jing[1];Zhang, Xianmei[1]

机构：[1]East China Univ Sci & Technol, Dept Phys, Shanghai 200237, Peoples R China;[2]Chinese Acad Sci, Key Lab Frontier Phys Controlled Nucl Fus, Hefei 230031, Peoples R China;[3]Chinese Acad Sci, Inst Plasma Phys, Hefei Inst Phys Sci, Hefei 230031, Peoples R China

年份：2025

卷号：67

期号：5

外文期刊名：PLASMA PHYSICS AND CONTROLLED FUSION

收录：;EI(收录号：20252118450027);WOS:【SCI-EXPANDED(收录号:WOS:001489071100001)】；

基金：The authors thank Dr Jiale Chen in Institute of Plasma Physics, Chinese Academy of Science for providing the equilibrium magnetic configuration and the plasma profiles of the CFETR hybrid scenario. This work is also grateful to Dr Pengfei Zhao for the help in NLT. This work was supported by the National MCF Energy R &D Program of China under Grant No. 2019YFE03060000, the National Natural Science Foundation of China under Grant Nos. 12375215 and 12405275, and the Strategic Priority Research Program of the Chinese Academy of Sciences (XDB0790201). The work was carried out at National Supercomputer Center in Tianjin, and the calculations were performed on Tianhe new generation supercomputer.

语种：英文

外文关键词：CFETR hybrid scenario; gyrokinetic simulation; fast ions; impurities; dilution effects

摘要：This study performs a numerical investigation into the effects of fast ions and impurities in the core region of deuterium-tritium (DT) plasma in the China Fusion Engineering Test Reactor hybrid scenario using the gyrokinetic code NLT. The linear simulations primarily focus on the particle fractions and the density gradients of fast ions and impurities on the linear frequencies of instabilities. The results reveal that tungsten impurities play a negligible impact on the linear frequencies of ion temperature gradient (ITG) instability and trapped electron mode (TEM), whereas argon impurities significantly suppress both ITG and TEM. Fast ions further stabilize ITG instability but destabilize TEM. Electromagnetic effects exhibit a stabilizing influence on both ITG and TEM. Nonlinear simulations demonstrate that the presence of argon impurities and fast ions significantly reduce the ion heat diffusivity, owing to the dilution effects of fast ions and argon impurities. The analysis on the poloidal spectra of perturbed electrostatic potential and DT total energy flux at the saturated stage reveal that ITG instability contributes dominantly to the turbulent transport. The DT total energy flux significantly decreases with a larger positive density gradient of fast ions/impurities. Furthermore, it is revealed that the fast ions suppress the turbulent transport through its dilution effects, while for argon impurities, in addition to the dilution effects, the density gradient effects also play a crucial role, especially under a larger positive density gradient. Moreover, as the density gradient of fast ions/impurities increases, the inward transport of deuterium and tritium particle fluxes are enhanced, and the accumulation of impurities in the core region significantly improves.