Gyrokinetic simulations of the kinetic electron effects on the electrostatic instabilities on the ITER baseline scenario  

作　　者：Debing ZHANG Pengfei ZHAO Yingfeng XU Lei YE Xianmei ZHANG 张德兵;赵鹏飞;徐颖峰;叶磊;张先梅(School of Physics,East China University of Science and Technology,Shanghai 200237,People’s Republic of China;Key Laboratory of Frontier Physics in Controlled Nuclear Fusion and Institute of Plasma Physics,Hefei Institutes of Physical Science,Chinese Academy of Sciences,Hefei 230031,People’s Republic of China;College of Science,Donghua University,Shanghai 201620,People’s Republic of China;Member of Magnetic Confinement Fusion Research Centre,Ministry of Education,Shanghai 201620,People’s Republic of China)

机构地区：[1]School of Physics,East China University of Science and Technology,Shanghai 200237,People’s Republic of China [2]Key Laboratory of Frontier Physics in Controlled Nuclear Fusion and Institute of Plasma Physics,Hefei Institutes of Physical Science,Chinese Academy of Sciences,Hefei 230031,People’s Republic of China [3]College of Science,Donghua University,Shanghai 201620,People’s Republic of China [4]Member of Magnetic Confinement Fusion Research Centre,Ministry of Education,Shanghai 201620,People’s Republic of China

出　　处：《Plasma Science and Technology》2024年第9期109-124,共16页等离子体科学和技术（英文版）

基　　金：supported by the National MCF Energy R&D Program of China(No.2019YFE03060000);National Natural Science Foundation of China(Nos.12005063,12375215 and 12175034);the Collaborative Innovation Program of Hefei Science Center,CAS(No.2022HSC-CIP008).

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 gradientsκ_(Ti,e)≡R=L_(Ti,e),the density gradientκ_(n)≡R/L_(n)and the ion-electron temperature ratioτ=T_(e)=T_(i).Here,is the major radius,and T_(e)and T_(i)denote the electron and ion temperatures,respectively.L_(A)=-(δ_(r)lnA)^(-1)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 k_(θ)region,respectively,wherek_(θ)is the poloidal wavenumber.The TEMdominant region becomes wider by increasing(decreasing)κ_(T_(e))(κ_(T_(i)))or by decreasingκ_(n).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 ofτ,rather than the value of T_(e)or T_(i),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 ITGdominated region,and contributions from the TEM(dominating in the higher k_(θ)region)to the nonlinear transport can be neglected.In

关 键 词：ITER baseline scenario gyrokinetic simulation kinetic electron effects electrostatic instability 

分 类 号：TL612[核科学技术—核技术及应用]