Characterisation of a MeV Bremsstrahlung x-ray source produced from a high intensity laser for high areal density object radiography
Characterisation of a MeV Bremsstrahlung x-ray source produced from a high intensity laser for high areal density object radiography
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DOI：
10.1063/1.4818505
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发表时间：
2013-08
影响因子：
2.2
通讯作者：
C. Courtois;R. Edwards;A. C. L. Fontaine;C. Aedy;S. Bazzoli;J. Bourgade;J. Gazave;J. Lagrange
中科院分区：
文献类型：
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作者：
C. Courtois;R. Edwards;A. C. L. Fontaine;C. Aedy;S. Bazzoli;J. Bourgade;J. Gazave;J. Lagrange
本文介绍了用短脉冲（<10 ps）、高强度（1.4 × 10 ~（19）W/cm ~ 2）激光产生MeV韧致辐射的实验结果。X射线发射的特点是使用几个诊断;核活化测量，校准的硬X射线光谱仪，和剂量计。从重建的X射线能谱的结果是一致的数值模拟使用PIC和蒙特卡罗代码之间的0.3和30兆电子伏。强烈的韧致辐射X射线源被用于对图像质量指示器（IQI）进行射线照相，该图像质量指示器（IQI）被厚钨吸收体严重过滤。观测结果表明，内部特征的像质计可以解决高达85克/平方厘米的外部面密度。通过厚分辨率网格的射线照相术推断的X射线源尺寸估计约为400 μm（X射线源点扩散函数的半高全宽）。
Results of an experiment to characterise a MeV Bremsstrahlung x-ray emission created by a short (<10 ps) pulse, high intensity (1.4 × 1019 W/cm2) laser are presented. X-ray emission is characterized using several diagnostics; nuclear activation measurements, a calibrated hard x-ray spectrometer, and dosimeters. Results from the reconstructed x-ray energy spectra are consistent with numerical simulations using the PIC and Monte Carlo codes between 0.3 and 30 MeV. The intense Bremsstrahlung x-ray source is used to radiograph an image quality indicator (IQI) heavily filtered with thick tungsten absorbers. Observations suggest that internal features of the IQI can be resolved up to an external areal density of 85 g/cm2. The x-ray source size, inferred by the radiography of a thick resolution grid, is estimated to be approximately 400 μm (full width half maximum of the x-ray source Point Spread Function).