A New Path to Improve High β_p Plasma Performance on EAST for Steady-State Tokamak Fusion Reactor  

作　　者：Baonian Wan 万宝年;无(Institute of Plasma Physics,Chinese Academy of Sciences,Hefei 230031;the EAST team)

机构地区：[1]Institute of Plasma Physics,Chinese Academy of Sciences,Hefei 230031

出　　处：《Chinese Physics Letters》2020年第4期85-87,共3页中国物理快报（英文版）

基　　金：Supported by the National Magnetic Confinement Fusion Science Program of China under Grant No.2015GB103000.

摘　　要：High βp scenario is foreseen to be a promising candidate operational mode for steady-state tokamak fusion reactors.Dedicated experiments on EAST and data analysis find that density gradient ▽n is a control knob to improve energy confinement in high βp plasmas at low toroidal rotatoon as projected for a fusion reactor.Different from previously known turbulent stabilization mechanisms such as E × B shear and Shafranov shift,high density gradient can enhance the Shafranov shift stabilizing effect significantly in high βp regime,giving that a higher density gradient is readily accessible in future fusion reactors with lower collisionality.This new finding is of great importance for the next-step fusion development because it may open a new path towards even higher energy conBnement in the high βp scenario.It has been demonstrated in the recent EAST experiments,i.e.,a fully non-inductive high βp(~2) H-mode plasma(H98y2≥1.3) has been obtained for a duration over 100 current diffusion times,which sets another new world record of long-pulse high-performance tokamak plasma operation with the normalized performance approaching the ITER and CFETR regimes.

关 键 词：mode PLASMA APPROACHING 

分 类 号：TL631.24[核科学技术—核技术及应用]