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首页> 外文期刊>Physica Scripta: An International Journal for Experimental and Theoretical Physics >Diagnostics of the dynamics of material damage by thermal shocks with the intensity possible in the ITER divertor
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Diagnostics of the dynamics of material damage by thermal shocks with the intensity possible in the ITER divertor

机译：通过热冲击诊断材料损伤动力学的热冲击在ITER VEREROR中的强度

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A novel BETA test facility (Beam of Electrons for materials Test Applications) was developed at the Budker Institute to study the erosion of materials directly during the impact of intense thermal shocks. A powerful (up to 7 MW) long pulse (100-300 mu s) electron beam is applied for experimental simulation of fast transient heat loads with the intensity probable in the ITER divertor. The heat flux parameter on a target can be widely varied (F-HF = 10-300 MW m(-2) s(0.5)) from a value significantly below the melting threshold to a value much higher, within the area of about 1 cm(2). The use of an electron beam to simulate the thermal impact on the material surface makes it possible to employ a variety of optical diagnostics for in situ observations of the dynamics of surface erosion processes during intense thermal shocks. These distinctive features make BETA a promising tool in the research of material surface erosion mechanisms and for experimental verification of various analytical and numerical models associated with these mechanisms. The first results obtained with this facility include fast (10 mu s exposure) imaging of the heated target in the near-infrared range and in the reflected light of 532 nm continuous wave (CW) laser, visualization of ejected tungsten particles using fast ICCD and CCD cameras with the minimal exposure of 2 mu s and 7 mu s respectively. The dynamics of dust particles ejected from the heated surface is investigated using a multichannel recording of the light of 532 nm CW-laser scattered on the dust particles. The present paper describes the first results of use of two new in situ methods: continuous recording of light scattered from the tungsten surface and three-dimensional tracking of tungsten particles using three viewing angles. The first method makes it possible to observe the dynamics of development of roughness and cracking of the polished tungsten surface, which manifest themselves as two successive processes separated by a larg
机译：在Budker研究所开发了一种新型的Beta测试设施（用于材料测试应用的电子束），以在强烈的热冲击的影响下直接研究材料的侵蚀。强大的（最多7mW）长脉冲（100-300 mu S）电子束施加用于快速瞬态热负荷的实验模拟，其强度在磨料中的倾斜器中可能的强度。目标上的热通量参数可以广泛变化（F-HF = 10-300 mW m°M（-2）s（0.5）），从大幅低于熔点阈值到大约1的范围内的值cm（2）。使用电子束来模拟材料表面的热撞击使得可以使用各种光学诊断，以便在强烈的热冲击期间的表面腐蚀过程的动态观察。这些独特的功能使得Beta成为材料表面侵蚀机制研究的有希望的工具，以及与这些机制相关的各种分析和数值模型的实验验证。用该设施获得的第一件结果包括在近红外范围内的加热靶的快速（10μs曝光）成像，并且在532nm连续波（CW）激光的反射光中，使用快速ICCD和型号CCD相机分别具有最小暴露2μs和7μs的。使用散射在灰尘颗粒上的532nm Cw-Laser的光的多通道记录来研究从加热表面喷射的粉尘颗粒的动力学。本文介绍了两种新原位方法的第一个使用结果：使用三个观察角度地连续记录从钨表面散射的光和三维跟踪钨颗粒。第一种方法使得可以观察抛光钨表面的粗糙度和开裂的发展动态，这表明自己作为由血管分开的两个连续过程

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