Modelling of lithium erosion and transport in FTU lithium experiments

Modelling of lithium erosion and transport in FTU lithium experiments
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FTU 锂实验中锂侵蚀和传输的建模

DOI:
10.1016/j.jnucmat.2013.01.146
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发表时间:
2013-07
影响因子:
3.1
通讯作者:
G.-N. Luo
G.-N. Luo
中科院分区:
工程技术2区
文献类型:
--
作者:
R. Ding;G. Maddaluno;M.L. Apicella;G. Mazzitelli;V. Pericoli Ridolfini;A. Kirschner;J.L. Chen;J.G. Li;G.-N. Luo

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利用ERO程序模拟了FTU实验中锂的侵蚀、输运和再沉积过程。两个不同的操作情况下,从LLL实验与不同的等离子体参数和表面温度进行了建模。根据有效的锂溅射产率,对于这两种情况,锂的侵蚀主要是由于物理溅射而不是蒸发。此外,模拟的再沉积分数蒸发锂是远远高于溅射锂,这是由于较短的电离热锂原子的平均自由程。因此,当表面温度低于450 ℃时,蒸发侵蚀效应与物理溅射相比可以忽略。根据模拟,大多数锂杂质以Li+的形式存在,并且锂离子的主要等离子体污染是低的,因为大多数被侵蚀的锂颗粒没有被输送到堆芯等离子体中并且停留在LCFS之外。
The ERO code has been used to simulate lithium erosion, transport and re-deposition from liquid lithium limiter experiments in FTU. Two different operational cases from LLL experiments with different plasma parameters and surface temperature are modelled. According to the effective lithium sputtering yields, for both cases the lithium erosion is mainly due to physical sputtering rather than evaporation. Furthermore, the modelled re-deposition fraction of evaporated lithium is much higher than that of sputtered lithium, which is due to the shorter ionisation mean free path of thermal lithium atoms. Therefore, the evaporation erosion effect can be neglected compared to physical sputtering when the surface temperature is below 450°C. According to the simulations, most of the lithium impurities exist in the form of Li+, and the main plasma contamination by lithium ions is low because most of eroded lithium particles are not transported into the core plasma and stay outside of the LCFS.
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