Simulation study of the influences of beryllium on the tokamak start-up process
Simulation study of the influences of beryllium on the tokamak start-up process
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铍对托卡马克启动过程影响的模拟研究
DOI：
10.1017/s002237782300106x
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发表时间：
2023-10
影响因子：
2.5
通讯作者：
Yanli Peng;Yan Qiu;Shiqiu Zhao;Shali Yang
中科院分区：
文献类型：
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作者：
Yanli Peng;Yan Qiu;Shiqiu Zhao;Shali Yang
托卡马克的启动强烈依赖于在等离子体击穿过程中形成的初始等离子体的状态。为了更好地理解这一过程，并估计铍杂质对欧姆加热托卡马克启动过程的影响，我们发展了一维粒子池内粒子与蒙特卡罗碰撞耦合的方法。主要目的是研究不同铍含量、不同放电参数下的等离子体性能。模拟了欧姆加热策略中含Be杂质的托卡马克击穿。模拟结果表明，与不含Be的情况相比，有Be杂质的情况下等离子体密度的增加受到抑制。杂质延迟了击穿时间。此外，在低电场工作情况下，成功击穿对放电参数的要求要高得多，因为在低电场放电中，铍杂质的影响更大。随着等离子体密度的增加，铍杂质对等离子体的影响变得更加严重。这表明在高密度的等离子体中，杂质是不能忽略的。
Tokamak start-up is strongly dependent on the state of the initial plasma formed during plasma breakdown. To acquire a better understanding of the process and to estimate the influence of the impurity of beryllium on the ohmic heating tokamak start-up process, one-dimensional particle-in-cell coupled with a Monte Carlo collision method has been developed. The main aim is to investigate the plasma performance under various amounts of beryllium with different discharge parameters. Tokamak breakdown with the impurity of beryllium in the ohmic heating strategy has been simulated. The simulation results show that with the impurity of beryllium, the increase of plasma density is suppressed compared with the case without beryllium. The breakdown time is delayed by the impurity. Moreover, the successful breakdown has a much higher requirement on discharge parameters with a low electric field operational scenario, since in the low electric field discharge the influence of beryllium impurity is greater. As the plasma density increases, the effect of beryllium impurity on plasma becomes more critical. It indicates that impurities cannot be neglected in the high plasma density.