Operation of a single-photon–counting x-ray charge-coupled device camera spectrometer in a petawatt environment
Operation of a single-photon–counting x-ray charge-coupled device camera spectrometer in a petawatt environment
复制标题
单光子计数 X 射线电荷耦合器件相机光谱仪在拍瓦环境中的运行
DOI：
10.1063/1.1788867
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发表时间：
2004
影响因子：
1.6
通讯作者：
P. Norreys
中科院分区：
文献类型：
--
作者：
C. Stoeckl;W. Theobald;T. Sangster;M. Key;P. Patel;B. Zhang;R. Clarke;S. Karsch;P. Norreys
在超短脉冲激光实验中，使用单光子计数X射线电荷耦合器件（CCD）相机作为X射线光谱仪是一种成熟的技术。在单光子计数模式中，每个读出像素的像素值与从入射X射线光子沉积的能量成比例。对于低于100 keV的光子，相当一部分事件将所有能量沉积在单个像素中。 像素读出值的直方图给出了X射线光谱的良好近似。这种技术几乎不需要对准，但它对信号背景问题非常敏感，特别是在高能拍瓦环境中。屏蔽目标的直接视线不足以获得高质量的光谱，因为这里报告的实验必须用长达10 cm的铅从所有侧面屏蔽CCD相机。
The use of a single-photon–counting x-ray charge-coupled device (CCD) camera as an x-ray spectrometer is a well-established technique in ultrashort-pulse laser experiments. In single-photon–counting mode, the pixel value of each readout pixel is proportional to the energy deposited from the incident x-ray photon. For photons below 100 keV, a significant fraction of the events deposits all the energy in a single pixel. A histogram of the pixel readout values gives a good approximation of the x-ray spectrum. This technique requires almost no alignment, but it is very sensitive to signal-to-background issues, especially in a high-energy petawatt environment. Shielding the direct line of sight to the target was not sufficient to obtain a high-quality spectrum, for the experiments reported here the CCD camera had to be shielded from all sides with up to 10 cm of lead.