摘要
HL-2A托卡马克装置在中性束加热条件下获得了稳定的归一化环向比压(β_(N))大于2.5的等离子体,并且实现了瞬态β_(N)=3.05、归一化密度(n_(e,1)/n_(e,G))~0.6、储能(WE)~46 kJ和高约束因子(H_(98))~1.65的高约束性能.本文使用集成模拟平台OMFIT对β_(N)=2.83和β_(N)=3.05时刻的等离子体进行了集成模拟,计算得到的WE,n_(e,1)/n_(e,G),H_(98)和β_(N)等与实验参数基本一致,并通过计算发现两种情况下自举电流份额(fBS)分别约达到45%和46%.此外,还进一步分析了HL-2A装置形成离子温度内部输运垒(ITB)的原因:快离子和E×B剪切流使得芯部湍流输运被抑制,改善了约束,从而形成了离子温度ITB.离子温度的ITB与H模边缘输运垒相互协同形成了高β_(N)的等离子体.
Tokamak is considered as the most promising experimental setup for achieving controllable nuclear fusion requirements.The parameterβ_(N)is an important parameter for tokamak devices:highβ_(N)benefits not only to plasma fusion but also to the enhancement of fusion reaction efficiency and the facilitation of steady-state operation.The HL-2A tokamak device has achieved stable plasma withβ_(N)exceeding than 2.5 through neutral beam injection heating,and transiently reachedβ_(N)=3.05,with a normalized density(n_(e,l)/n_(e,G))of about 0.6,stored energy(W_(E))of around 46 kJ,and confinement improvement factor(H_(98))of about 1.65.In this work,the integrated simulation platform OMFIT is used to analyze the plasma atβ_(N)=2.83 andβ_(N)=3.05,and the obtained W_(E),n_(e,l)/n_(e,G),H_(98),β_(N),etc.are consistent with the experimental parameters.The bootstrap current(f_(BS))can reach to 45%and 46%.At both of the above moments,there are ion temperature double transport barrier(DTB)generated by the coexistence of internal transport barrier(ITB)and edge transport barrier(ETB),while highβ_(N)is usually related to DTB.In addition,the formation of ion temperature ITB in the HL-2A device is further analyzed,which is attributed to the dominance of turbulent transport in plasma transport,the suppression of turbulent transport in the core by fast ions and E×B shear,and the resulting improvement in confinement,thereby ultimately leading to the formation of ion temperature ITB.The ITB of ion temperature and the ETB of H-mode synergistically contribute to the creation of highβ_(N)plasma.
作者
李正吉
陈伟
孙爱萍
于利明
王卓
陈佳乐
许健强
李继全
石中兵
蒋敏
李永高
何小雪
杨曾辰
李鉴
Li Zheng-Ji;Chen Wei;Sun Ai-Ping;Yu Li-Ming;Wang Zhuo;Chen Jia-Le;Xu Jian-Qiang;Li Ji-Quan;Shi Zhong-Bing;Jiang Min;Li Yong-Gao;He Xiao-Xue;Yang Zeng-Chen;Li Jian(Southwestern Institute of Physics,China National Nuclear Corporation,Chengdu 610041,China;Institute of Plasma Physics,Chinese Academy of Sciences,Hefei 230031,China;Units of 61287,Chengdu 610000,China)
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2024年第6期250-257,共8页
Acta Physica Sinica
基金
国家重点研发计划(批准号:2019YFE03020002,2019YFE03040004)
国家自然科学基金(批准号:12125502)资助的课题。
