Bremsstrahlung emission from high power laser interactions with constrained targets for industrial radiography
Bremsstrahlung emission from high power laser interactions with constrained targets for industrial radiography
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DOI：
10.1017/hpl.2019.8
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发表时间：
2019-04
影响因子：
4.8
通讯作者：
C. Armstrong;C. Brenner;C. Jones;D. Rusby;Z. Davidson;Y. Zhang;J. Wragg;S. Richards;C. Spindloe
中科院分区：
文献类型：
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作者：
C. Armstrong;C. Brenner;C. Jones;D. Rusby;Z. Davidson;Y. Zhang;J. Wragg;S. Richards;C. Spindloe
激光-固体相互作用非常适合作为非破坏性成像的高能X射线的潜在来源。明亮、高能的X射线脉冲可以从一个很小的源驱动，这使其成为高分辨率X射线照相的理想选择。通过限制目标的横向尺寸，我们能够限制产生X射线的区域，从而使成像具有更高的分辨率和对比度。使用受约束的目标，我们实验演示了$(20\pM3)~\Unicode[STIX]{x03BC}\Text{m}$X射线源，与非受约束的箔目标相比，改善了图像质量。模拟表明，围绕受约束目标周围的较大鞘场包络增加了通过目标再循环的电子电流的比例，从而驱动更明亮的X射线源。
Laser–solid interactions are highly suited as a potential source of high energy X-rays for nondestructive imaging. A bright, energetic X-ray pulse can be driven from a small source, making it ideal for high resolution X-ray radiography. By limiting the lateral dimensions of the target we are able to confine the region over which X-rays are produced, enabling imaging with enhanced resolution and contrast. Using constrained targets we demonstrate experimentally a $(20\pm 3)~\unicode[STIX]{x03BC}\text{m}$ X-ray source, improving the image quality compared to unconstrained foil targets. Modelling demonstrates that a larger sheath field envelope around the perimeter of the constrained targets increases the proportion of electron current that recirculates through the target, driving a brighter source of X-rays.