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Improved count rate corrections for highest data quality with PILATUS detectors

机译:利用PILATUS检测器改进了计数率校正以实现最高数据质量

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摘要

The PILATUS detector system is widely used for X-ray experiments at third-generation synchrotrons. It is based on a hybrid technology combining a pixelated silicon sensor with a CMOS readout chip. Its single-photon-counting capability ensures precise and noise-free measurements. The counting mechanism introduces a short dead-time after each hit, which becomes significant for rates above 106 photons s−1 pixel−1. The resulting loss in the number of counted photons is corrected for by applying corresponding rate correction factors. This article presents the results of a Monte Carlo simulation which computes the correction factors taking into account the detector settings as well as the time structure of the X-ray beam at the synchrotron. The results of the simulation show good agreement with experimentally determined correction factors for various detector settings at different synchrotrons. The application of accurate rate correction factors improves the X-ray data quality acquired at high photon fluxes. Furthermore, it is shown that the use of fast detector settings in combination with an optimized time structure of the X-ray beam allows for measurements up to rates of 107 photons s−1 pixel−1.
机译:PILATUS探测器系统被广泛用于第三代同步加速器的X射线实验。它基于将像素化硅传感器与CMOS读出芯片相结合的混合技术。其单光子计数功能可确保进行精确且无噪声的测量。计数机制会在每次命中后引入较短的死区时间,这对于高于10 6 光子s -1 像素 -1 的速率而言非常重要。通过应用相应的速率校正因子,可以校正所计数的光子数量所导致的损失。本文介绍了蒙特卡洛模拟的结果,该模拟计算了校正因子,其中考虑了检测器设置以及同步加速器X射线束的时间结构。仿真结果表明,与实验确定的校正因子在不同同步加速器上的各种检测器设置具有良好的一致性。精确的速率校正因子的应用可以提高在高光子通量下获得的X射线数据质量。此外,还表明,结合使用快速检测器设置和优化的X射线束时间结构,可以进行高达10 7 光子s -1 的测量sup> pixel -1

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