{"title":"等离子体中的轻杂质对钨溅射的影响","authors":"V. S. Mikhailov, P. Yu. Babenko, A. N. Zinoviev","doi":"10.1134/s1027451024020095","DOIUrl":null,"url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">\n<b>Abstract</b>—</h3><p>Calculations of the tungsten sputtering yields (the divertor material in the ITER tokamak) by He, Be, N, and O—impurity atoms in the plasma—were carried out at a collision energy of 0.010–100 keV using the Monte Carlo method. To calculate the trajectory of the incident particle, pair potentials obtained within the framework of density functional theory were used. These potentials were corrected for the parameters of the potential well obtained from spectroscopic measurements. The target consisted of tungsten randomly oriented crystals the size of one lattice constant. Next, the trajectories of the recoil particles were calculated using many-particle potentials calculated using density functional theory. Thermal vibrations of target atoms were taken into account. The vibration amplitude was taken to be 0.05 Å, which corresponded to room temperature. The strong dependence of the results on the shape of the surface potential barrier is shown, and the results are presented for two limiting cases of the surface state: a flat surface, when a planar surface potential barrier is realized, and a surface consisting of cones, when a spherical potential barrier occurs. In the experiment, the surface has some roughness, which depends on the experimental conditions. It is shown that the experimental results lie between the limiting cases we considered. 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引用次数: 0
摘要
摘要-采用蒙特卡洛方法计算了等离子体中 He、Be、N 和 O 杂质原子在 0.010-100 千伏碰撞能量下的钨溅射产率(ITER 托卡马克中的分流器材料)。为了计算入射粒子的轨迹,使用了在密度泛函理论框架内获得的对位势。这些电位根据光谱测量获得的电位井参数进行了修正。目标由一个晶格常数大小的钨随机定向晶体组成。接着,使用密度泛函理论计算的多粒子势来计算反冲粒子的轨迹。目标原子的热振动被考虑在内。振动幅度取为 0.05 Å,相当于室温。实验结果表明,表面势垒的形状对实验结果有很强的依赖性,实验结果显示了表面状态的两种极限情况:实现平面势垒时的平面表面和出现球形势垒时由锥形组成的表面。在实验中,表面有一定的粗糙度,这取决于实验条件。实验结果表明,实验结果介于我们考虑的极限情况之间。获得了关于溅射原子平均能量和角度分布的信息,这些信息对于计算杂质进入托卡马克等离子体是必要的。
Tungsten Sputtering Yields by Light Impurities of Plasma
Abstract—
Calculations of the tungsten sputtering yields (the divertor material in the ITER tokamak) by He, Be, N, and O—impurity atoms in the plasma—were carried out at a collision energy of 0.010–100 keV using the Monte Carlo method. To calculate the trajectory of the incident particle, pair potentials obtained within the framework of density functional theory were used. These potentials were corrected for the parameters of the potential well obtained from spectroscopic measurements. The target consisted of tungsten randomly oriented crystals the size of one lattice constant. Next, the trajectories of the recoil particles were calculated using many-particle potentials calculated using density functional theory. Thermal vibrations of target atoms were taken into account. The vibration amplitude was taken to be 0.05 Å, which corresponded to room temperature. The strong dependence of the results on the shape of the surface potential barrier is shown, and the results are presented for two limiting cases of the surface state: a flat surface, when a planar surface potential barrier is realized, and a surface consisting of cones, when a spherical potential barrier occurs. In the experiment, the surface has some roughness, which depends on the experimental conditions. It is shown that the experimental results lie between the limiting cases we considered. Information was obtained on the average energy of sputtered atoms and angular distributions necessary for calculating the entry of impurities into the tokamak plasma.
期刊介绍:
Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques publishes original articles on the topical problems of solid-state physics, materials science, experimental techniques, condensed media, nanostructures, surfaces of thin films, and phase boundaries: geometric and energetical structures of surfaces, the methods of computer simulations; physical and chemical properties and their changes upon radiation and other treatments; the methods of studies of films and surface layers of crystals (XRD, XPS, synchrotron radiation, neutron and electron diffraction, electron microscopic, scanning tunneling microscopic, atomic force microscopic studies, and other methods that provide data on the surfaces and thin films). Articles related to the methods and technics of structure studies are the focus of the journal. The journal accepts manuscripts of regular articles and reviews in English or Russian language from authors of all countries. All manuscripts are peer-reviewed.