Stabilization of ion-temperature-gradient mode by trapped fast ions  

作　　者：Siqi WANG Huishan CAI Baofeng GAO Ding LI 王思琪;蔡辉山;高宝峰;李定(CAS Key Laboratory of Geospace Environment,School of Nuclear Science and Technology,University of Science and Technology of China,Hefei 230026,People's Republic of China;Institute of Physics,Chinese Academy of Sciences,Beijing 100190,People's Republic of China)

机构地区：[1]CAS Key Laboratory of Geospace Environment,School of Nuclear Science and Technology,University of Science and Technology of China,Hefei 230026,People's Republic of China [2]Institute of Physics,Chinese Academy of Sciences,Beijing 100190,People's Republic of China

出　　处：《Plasma Science and Technology》2022年第6期105-115,共11页等离子体科学和技术（英文版）

基　　金：National Natural Science Foundation of China(Nos.11822505,11835016 and 11675257);the Youth Innovation Promotion Association CAS,the Users with Excellence Program of Hefei Science Center CAS(No.2019HSC-UE013);the Fundamental Research Funds for the Central Universities(No.WK3420000008);the Collaborative Innovation Program of Hefei Science Center CAS(No.2019HSC-CIP014)。

摘　　要：Understanding and modeling fast-ion stabilization of ion-temperature-gradient(ITG)driven microturbulence have profound implications for designing and optimizing future fusion reactors.In this work,an analytic model is presented,which describes the effect of fast ions on ITG mode.This model is derived from a bounce-average gyro-kinetic equation for trapped fast ions and ballooning transformation for ITG mode.In addition to dilution,strong wave-fast-ion resonant interaction is involved in this model.Based on numerical calculations,the effects of the main physical parameters are studied.The increasing density of fast ions will strengthen the effects of fast ions.The effect of wave-particle resonance strongly depends on the temperature of fast ions.Furthermore,both increasing density gradient and the ratio of the temperature and density gradients can strengthen the stabilization of fast ions in ITG mode.Finally,the influence of resonance broadening of wave-particle interaction is discussed.

关 键 词：fast ions ITG instability gyro-kinetic 

分 类 号：TL612[核科学技术—核技术及应用]