Mechanism of enhanced ion temperature by impurity seeding in EAST H-mode plasma

• DOI: 10.1088/1741-4326/ad0795
• Publication Date: 2023-10-27T22:24:35Z
• Authors: Xiuda Yang; Xianzu Gong; Jinping Qian; Yifei Jin; Pierre Manas; Pan Li; Clarisse Bourdelle; Yuqi Chu; Bin Zhang; Yingjie Chen; Yunchan Hu; Yingying Li; Kedong Li; Xuexi Zhang; Yanmin Duan; Hongming Zhang; Tianqi Jia; Haiqing Liu; Qing Zang; Juan Huang; Rui Ding; Liang Wang; Guosheng Xu
• Keywords: Electron temperature

Abstract Ion temperature ( T i ) profiles are commonly observed to increase in peaking, leading higher central , after impurity seeding the EAST H-mode plasma. Argon can be more efficient at raising than neon. Toroidal rotation also enhanced scenarios with NBI heating. A significant toroidal is brought about by argon Turbulence experimentally suppressed. Extensive modeling using quasilinear gyrokinetic code QuaLiKiz performed explain above observations. It found that always explained turbulence stabilization. However, mechanism of stabilization related heating methods and species. In pure RF (ECRH + LHW) scenarios, where only trapped electron mode (TEM) exists, stabilize TEM significantly neon due its charge heavier mass. increasing power, ion heat flux dominated gradient (ITG), thus mainly attributed ITG these cases, except argon’s ability efficiently TEM, evident increased beneficial turbulence.