Modeling study of radiation characteristics with different impurity species seeding in EAST
Modeling study of radiation characteristics with different impurity species seeding in EAST
复制标题
EAST不同杂质种种辐射特性的模拟研究
DOI：
10.1063/1.4997101
复制
发表时间：
2017
影响因子：
2.2
通讯作者：
Gao X.
中科院分区：
文献类型：
--
作者：
Liu X. J.;Deng G. Z.;Wang L.;Liu S. C.;Zhang L.;Li G. Q.;Gao X.
对于EAST和未来的托卡马克机器，如ITER和中国聚变工程试验堆，一个关键问题是如何处理偏滤器靶板上的过多热负荷。作为主动减少和控制流向靶板的功率通量的有效手段，利用SOLPS5.0对双零位结构EAST的L模放电进行了下穹顶局部杂质(N，Ne，Ar)气体膨胀的研究。比较了不同杂质的辐射效率和分布。给出了与堆芯等离子体性能密切相关的N、Ne、Ar种子对靶功率负载、进入刮离层的功率、沿极向长度和边缘有效离子电荷数的浓度的影响。模拟结果表明，N、Ne、Ar三种离子注入都能有效地降低偏滤器靶的峰值热负荷和电子温度。氮素播种可以达到最高的辐射损失率和最低辐射损失率。
A critical issue for EAST and future tokamak machines such as ITER and China Fusion Engineering Testing Reactor is the handling of excessive heat load on the divertor target plates. As an effective means of actively reducing and controlling the power fluxes to the target plates, localized impurity (N, Ne, and Ar) gas puffing from the lower dome is investigated by using SOLPS5.0 for an L-mode discharge on EAST with double null configuration. The radiative efficiency and distribution of different impurities are compared. The effect of N, Ne, and Ar seeding on target power load, the power entering into scrape-off layer (SOL), Psep, and their concentration in SOL along the poloidal length and edge effective ion charge number (Zeff) which are closely related to core plasma performance are presented. The simulation results indicate that N, Ne, and Ar seeding can effectively reduce the peak heat load and electron temperature at divertor targets similarly. N seeding can reach the highest radiative loss fraction a...