文献类型：期刊文献

英文题名：Gyrokinetic simulations of the kinetic electron effects on the electrostatic instabilities on the ITER baseline scenario

作者：Zhang, Debing[1];Zhao, Pengfei[2,3];Xu, Yingfeng[4,5];Ye, Lei[2,3];Zhang, Xianmei[1]

机构：[1]East China Univ Sci & Technol, Sch Phys, Shanghai 200237, Peoples R China;[2]Chinese Acad Sci, Hefei Inst Phys 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;[4]Donghua Univ, Coll Sci, Shanghai 201620, Peoples R China;[5]Minist Educ, Magnet Confinement Fus Res Ctr, Shanghai 201620, Peoples R China

年份：2024

卷号：26

期号：9

外文期刊名：PLASMA SCIENCE & TECHNOLOGY

收录：;EI(收录号：20243216818493);WOS:【SCI-EXPANDED(收录号:WOS:001281937200001)】；

基金：The authors thank Prof. Shaojie Wang from the Universityof Science and Technology of China for supporting thecomputational sources, and also thank Prof. Yong Xiao from Zhejiang University for providing the magnetic configura-tion of the ITER baseline scenario. This work was supportedby the National MCF Energy R &D Program of China (No.2019YFE03060000), National Natural Science Foundation of China (Nos. 12005063, 12375215 and 12175034), and the Collaborative Innovation Program of Hefei Science Center, CAS (No. 2022HSC-CIP008).

语种：英文

外文关键词：ITER baseline scenario; gyrokinetic simulation; kinetic electron effects; electrostatic instability

摘要：The linear and nonlinear simulations are carried out using the gyrokinetic code NLT for the electrostatic instabilities in the core region of a deuterium plasma based on the International Thermonuclear Experimental Reactor (ITER) baseline scenario. The kinetic electron effects on the linear frequency and nonlinear transport are studied by adopting the adiabatic electron model and the fully drift-kinetic electron model in the NLT code, respectively. The linear simulations focus on the dependence of linear frequency on the plasma parameters, such as the ion and electron temperature gradients , the density gradient and the ion-electron temperature ratio . Here, is the major radius, and and denote the electron and ion temperatures, respectively. is the gradient scale length, with denoting the density, the ion and electron temperatures, respectively. In the kinetic electron model, the ion temperature gradient (ITG) instability and the trapped electron mode (TEM) dominate in the small and large region, respectively, where is the poloidal wavenumber. The TEM-dominant region becomes wider by increasing (decreasing) ( ) or by decreasing . For the nominal parameters of the ITER baseline scenario, the maximum growth rate of dominant ITG instability in the kinetic electron model is about three times larger than that in the adiabatic electron model. The normalized linear frequency depends on the value of , rather than the value of or , in both the adiabatic and kinetic electron models. The nonlinear simulation results show that the ion heat diffusivity in the kinetic electron model is quite a lot larger than that in the adiabatic electron model, the radial structure is finer and the time oscillation is more rapid. In addition, the magnitude of the fluctuated potential at the saturated stage peaks in the ITG-dominated region, and contributions from the TEM (dominating in the higher region) to the nonlinear transport can be neglected. In the adiabatic electron model, the zonal radial electric field is found to be mainly driven by the turbulent energy flux, and the contribution of turbulent poloidal Reynolds stress is quite small due to the toroidal shielding effect. However, in the kinetic electron model, the turbulent energy flux is not strong enough to drive the zonal radial electric field in the nonlinear saturated stage. The kinetic electron effects on the mechanism of the turbulence-driven zonal radial electric field should be further investigated.