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Charge-state dynamics of heavy-ion beams penetrating a hydrogen plasma
Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms ( IF 1.3 ) Pub Date : 2021-06-15 , DOI: 10.1016/j.nimb.2021.06.003
V.P. Shevelko , S.N. Andreev , Inga Yu. Tolstikhina

The dynamics of charge-state fractions of Au- and U-ion beams, penetrating hydrogen plasmas, is investigated for 1.4 and 3.6 MeV/u ion energies and plasma electron temperatures Te = (0.6 − 3.0) eV and densities Ne =(1016 − 1020) cm−3. Calculations of the fractions as a function of the plasma thickness are performed by solving the balance rate equations with calculated ionization and recombination rates including those for dielectronic recombination (DR). The DR rates are calculated by the recently created computer code DRIMP using the fully relativistic multi-configuration approach and the so-called shifted Maxwellian velocity distribution function. Calculated by this method DR rates of Au- and U-ion beams passing through a hydrogen plasma are presented for the first time. Using the results obtained, the temperatures Te and densities Ne are found at which the equilibrium mean charges q̄ of Au- and U-ion beams are maximal for hydrogen-plasma length L 100 cm. Dependencies of the plasma equilibrium thicknesses Xeq on the initial charge q0 of incident ions are investigated, and it is found that Xeq values are minimal at q0q̄.



中文翻译:

重离子束穿透氢等离子体的电荷态动力学

针对 1.4 和 3.6 MeV/u 离子能量和等离子体电子温度,研究了穿透氢等离子体的 Au 和 U 离子束的电荷态分数的动力学 电子 = (0.6 − 3.0) eV 和密度 N电子=(10 16  - 10 20 ) cm -3。作为等离子体厚度的函数的分数的计算是通过使用计算的电离和复合率(包括双电子复合(DR))求解平衡率方程来执行的。DR 率由最近创建的计算机代码 DRIMP 使用完全相对论的多配置方法和所谓的移位麦克斯韦速度分布函数计算。通过这种方法计算的金离子和 U 离子束通过氢等离子体的 DR 率首次出现。使用获得的结果,温度电子 和密度 N电子 找到平衡平均电荷 q̄ Au 和 U 离子束的数量对于氢等离子体长度是最大的 100 厘米。等离子体平衡厚度的相关性X电子q 初次收费 q0 对入射离子进行了研究,发现 X电子q 值在 q0q̄.

更新日期:2021-06-15
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