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Structural Changes in Surface Layers of Vanadium Induced by the Separate and Sequential Impact of Helium Ions and Pulsed Laser Radiation
Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques Pub Date : 2021-04-21 , DOI: 10.1134/s102745102102021x
I. V. Borovitskaya , S. N. Korshunov , A. N. Mansurova , G. G. Bondarenko , A. I. Gaidar , E. E. Kazilin , V. V. Paramonova

Abstract

Changes in the morphology of the vanadium surface are studied as a result of the separate and sequential action of helium ions (for an energy of 30 keV, a dose of 1.0 × 1022 m–2, an ion-flux density of 4.8 × 1018 m–2 s –1, and a temperature of ~500 K) and high-power pulsed laser radiation in the Q-switched mode (power density of q = 1.2 × 1012 W/m2, pulse duration of τ0 = 50 ns, and a pulse number N varying from 1 to 4). It is found that the effect of laser irradiation on vanadium samples before and after ion implantation (resulting in the formation of a crater with a rim due to the splashing of melted metal) is identical. In the case of the preliminary introduction of helium into the material the splash of metal is more intense. Helium implanted into the samples causes radiation blistering; the subsequent influence of laser pulses intensifies material erosion in the area located immediately behind the rim (resulting in a growing number of peeled layers, merging blisters, etc.), which is probably triggered by high temperatures and thermal stresses emerging in this area (even after discontinuing laser irradiation). Under reactor operating conditions this effect can lead to increased plasma contamination. It is shown that the damage of a target inside the craters in the initial vanadium samples feature occasional cracks, wavy and droplet structures, as well as beading, whereas along with the above changes the samples pre-irradiated with helium contain no cracks inside the crater although areas showing boiling of the material are clearly visible.



中文翻译:

氦离子和脉冲激光辐射的分次顺序影响引起的钒表面层的结构变化

摘要

由于氦离子的分离和顺序作用,钒表面的形态发生了变化(对于能量为30 keV,剂量为1.0×10 22 m –2,离子通量密度为4.8×10 18-2小号-1和〜500 K),并在q开关模式(高功率脉冲的激光辐射的功率密度的温度q = 1.2×10 12 W /米2,的脉冲持续时间τ 0 = 50 ns,脉冲数N从1到4不等)。已经发现,在离子注入之前和之后,激光辐照对钒样品的影响是相同的(由于熔融金属的飞溅导致形成带有边缘的火山口)。在将氦气初步引入材料的情况下,金属飞溅更加强烈。氦气注入到样品中会引起辐射起泡。激光脉冲的后续影响加剧了紧靠轮辋后方区域的材料侵蚀(导致越来越多的剥离层,气泡合并等),这很可能是由于该区域出现高温和热应力而导致的(甚至停止激光照射后)。在反应堆运行条件下,这种影响会导致血浆污染增加。

更新日期:2021-04-21
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