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Pulsed power electron and ion beams diagnostics based on simultaneous detection of acoustic longitudinal and flexural waves

机译:基于同时检测纵向和弯曲声波的脉冲功率电子和离子束诊断

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摘要

A method and technique for measuring the pulsed power electron and ion beam energy density (W in J/m/sup 2/) absorbed by a target as well as the main elastic constants of material have been proposed and realized. The method developed is based on the authors' laser-interferometric and theoretical investigations of the space-time characteristics and amplitudes of thermoacoustic waves excited by pulsed power electron beams in various solids: metals; alloys; semiconductors; amorphous and crystalline dielectrics; and composites. Experimental conditions under which compression-expansion pulse of the longitudinal wave and flexural oscillations of a sample can be observed simultaneously, have been found. As the experiments have shown, the amplitude of thermoelastic flexural wave as well as the amplitude of longitudinal pulse is proportional to W. The authors reconstruct the profile of beam dose absorbed by material and determine W using available standard samples with known elastic constants and Gruneisen's parameter and the interferometry data on longitudinal and flexural thermoacoustic waves.
机译:提出并实现了一种测量目标吸收的脉冲功率电子和离子束能量密度(W in J / m / sup 2 /)以及材料的主要弹性常数的方法和技术。所开发的方法是基于作者对不同固体中脉冲功率电子束激发的热声波的时空特性和幅度进行激光干涉和理论研究的基础。合金半导体;非晶和晶体电介质;和复合材料。已经发现了可以同时观察到纵波的压缩-膨胀脉冲和样品的弯曲振动的实验条件。如实验所示,热弹性弯曲波的振幅​​和纵向脉冲的振幅与W成正比。作者重建了材料吸收的光束剂量的分布图,并使用具有已知弹性常数和Gruneisen参数的可用标准样品确定W以及纵向和弯曲热声波的干涉数据。

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