抽气对HL-2A装置偏滤器靶板热负载的影响研究  

The effect of heat load on divertor target by pumping in HL-2ATokamak

作　　者：王哲[1] 黄千红[1] 谭清懿 叶浩然 曹诚志 WANG Zhe;HUANG Qianhong;TAN Qingyi;YE Haoran;CAO Chengzhi(University of South China,Hengyang 421001,China;Southwestern Institute of Physics,Chengdu 610041,China)

机构地区：[1]南华大学,衡阳421001 [2]核工业西南物理研究院,成都610041

出　　处：《核技术》2022年第10期91-100,共10页Nuclear Techniques

基　　金：国家磁约束核聚变能发展研究专项(No.2018YFE0303102、No.2018YFE0309101);国家自然科学基金(No.12075114);湖南省自然科学基金(No.2021JJ50090、No.2021JJ50095)资助。

摘　　要：磁约束核聚变托卡马克装置来自芯部的高强热流与偏滤器靶板相互作用,不但会直接影响偏滤器寿命,同时会产生大量杂质影响等离子体芯部性能,而抽气是控制等离子体密度和杂质密度的重要手段。本文基于环流2号托卡马克(HL-2A)装置利用SOLPS-ITER程序研究了不同上游电子密度条件下抽气对偏滤器靶板热负载的影响。通过密度扫描发现在脱靶阈值(T^(OSP) _(et)-5 eV)附近抽气对靶板热负载影响更大,在抽气速率分别为12 m^(3)·s^(−1)、36 m^(3)·s^(−1)和96 m^(3)·s^(−1)时,外靶板脱靶阈值和热负载峰值分别为无抽气条件下的1.11、1.24、1.39倍和1.37、1.96、2.54倍。进一步从原子分子碰撞过程分析了n_(e,sep)=0.19×10^(19)m^(−3)、0.6×10^(19)m^(−3)、0.9×10^(19)m^(−3)上游密度条件下抽气对偏滤器区等离子体和中性粒子参数分布的影响,发现在脱靶后密度条件下抽气会使氘分子密度明显降低,碰撞反应损耗的能量降低,从而导致靶板等离子体温度和能流增加。[Background]The energy produced by nuclear fusion on a Tokamak device is mainly exhausted through the divertor,its service life is directly affected by the interaction between huge heat flux from core and the divertor target.The large amount of impurity produced by the heat flux hitting the target leads to the reduction of the plasma confinement performance whilst pumping is an important means to control plasma density and impurity density.[Purpose]This study aims to investigate the influence of pumping on the heat load of the target plate which is of reference significance for the future experiment.[Methods]Based on the experimental parameters of the HL-2A Tokamak,SOLPS-ITER code was used to study the effect of pumping on the heat load of the divertor target under different upstream electron densities.Analysis was performed through density scanning to find the sensitive threshold whilst and atom-molecular collision process was applied to the effect of pumping on the distribution of plasma and neutral particle parameters in divertor region at different upstream electron density.[Results]Density scanning results show that pumping near the detachment threshold(T^(OSP)_(et)-5 eV)has a greater effect on the thermal load of the target plate.When the pumping rate is 12 m^(3)·s^(−1),36 m^(3)·s^(−1) and 96 m^(3)·s^(−1) respectively,the miss threshold and thermal load peak of outer target plate are 1.11,1.24,1.39 and 1.37,1.96,2.54 times of those without pumping respectively.[Conclusion]It is found that the decreases of deuterium molecular density results in the energy of the collision reaction power decreases when the upstream electron density exceeds the detachment threshold,leads to the increase of the temperature and energy flow of the plasma in the target plate.

关 键 词：托卡马克 偏滤器脱靶 抽气 边界等离子体 

分 类 号：O532.11[理学—等离子体物理]