Effects of counter-current driven by electron cyclotron waves on neoclassical tearing mode suppression  

作　　者：高钦 郑平卫 Qin Gao;Ping-Wei Zheng(School of Resource Environment and Safety Engineering,University of South China,Hengyang 421001,China;Demonstration Base for International Science and Technology Cooperation on Nuclear Energy and Nuclear Safety,University of South China,Hengyang 421001,China)

机构地区：[1]School of Resource Environment and Safety Engineering,University of South China,Hengyang 421001,China [2]Demonstration Base for International Science and Technology Cooperation on Nuclear Energy and Nuclear Safety,University of South China,Hengyang 421001,China

出　　处：《Chinese Physics B》2024年第5期501-509,共9页中国物理B（英文版）

基　　金：Project supported by the National Key R&D Program of China(Grant Nos.2022YFE03070000 and 2022YFE03070003);the National Natural Science Foundation of China(Grant Nos.12375220 and 12075114);the Hunan Provincial Natural Science Foundation(Grant No.2021JJ30569);the Doctoral Initiation Fund Project of University of South China(Grant No.190XQD114);the Hunan Nuclear Fusion International Science and Technology Innovation Cooperation Base(Grant No.2018WK4009);the Hengyang Key Laboratory of Magnetic Confinement Nuclear Fusion Research(Grant No.2018KJ108)。

摘　　要：Through theoretical analysis,we construct a physical model that includes the influence of counter-external driven current opposite to the plasma current direction in the neoclassical tearing mode(NTM).The equation is used with this model to obtain the modified Rutherford equation with co-current and counter-current contributions.Consistent with the reported experimental results,numerical simulations have shown that the localized counter external current can only partially suppress NTM when it is far from the resonant magnetic surface.Under some circumstances,the Ohkawa mechanism dominated current drive(OKCD)by electron cyclotron waves can concurrently create both co-current and counter-current.In this instance,the minimal electron cyclotron wave power that suppresses a particular NTM was calculated by the Rutherford equation.The result is marginally less than when taking co-current alone into consideration.As a result,to suppress NTM using OKCD,one only needs to align the co-current with a greater OKCD peak well with the resonant magnetic surface.The effect of its lower counter-current does not need to be considered because the location of the counter-current deviates greatly from the resonant magnetic surface.

关 键 词：driven current neoclassical tearing mode modified Rutherford equation electron cyclotron waves 

分 类 号：O441[理学—电磁学]