Photon-counting MCP/Timepix detectors for soft X-ray imaging and spectroscopic applications,Journal of Synchrotron Radiation

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Photon-counting MCP/Timepix detectors for soft X-ray imaging and spectroscopic applications
Journal of Synchrotron Radiation ( IF 2.4 ) Pub Date : 2021-05-28 , DOI: 10.1107/s1600577521003908
Anton S Tremsin ₁ , John V Vallerga ₁ , Oswald H W Siegmund ₁ , Justin Woods ₂ , Lance E De Long ₃ , Jeffrey T Hastings ₃ , Roland J Koch ₄ , Sophie A Morley ₄ , Yi De Chuang ₄ , Sujoy Roy ₄

Affiliation

Detectors with microchannel plates (MCPs) provide unique capabilities to detect single photons with high spatial (<10 µm) and timing (<25 ps) resolution. Although this detection technology was originally developed for applications with low event rates, recent progress in readout electronics has enabled their operation at substantially higher rates by simultaneous detection of multiple particles. In this study, the potential use of MCP detectors with Timepix readout for soft X-ray imaging and spectroscopic applications where the position and time of each photon needs to be recorded is investigated. The proof-of-principle experiments conducted at the Advanced Light Source demonstrate the capabilities of MCP/Timepix detectors to operate at relatively high input counting rates, paving the way for the application of these detectors in resonance inelastic X-ray scattering and X-ray photon correlation spectroscopy (XPCS) applications. Local count rate saturation was investigated for the MCP/Timepix detector, which requires optimization of acquisition parameters for a specific scattering pattern. A single photon cluster analysis algorithm was developed to eliminate the charge spreading effects in the detector and increase the spatial resolution to subpixel values. Results of these experiments will guide the ongoing development of future MCP devices optimized for soft X-ray photon-counting applications, which should enable XPCS dynamics measurements down to sub-microsecond timescales.

中文翻译：

用于软 X 射线成像和光谱应用的光子计数 MCP/Timepix 探测器

带有微通道板 (MCP) 的探测器提供了独特的功能，可以检测具有高空间 (<10 µm) 和定时 (<25 ps) 分辨率的单光子。虽然这种检测技术最初是为低事件率的应用而开发的，但读出电子学的最新进展通过同时检测多个粒子，使其能够以更高的速率运行。在这项研究中，研究了带有 Timepix 读数的 MCP 探测器在软 X 射线成像和光谱应用中的潜在用途，其中需要记录每个光子的位置和时间。在 Advanced Light Source 进行的原理验证实验证明了 MCP/Timepix 检测器在相对较高的输入计数率下运行的能力，为这些探测器在共振非弹性 X 射线散射和 X 射线光子相关光谱 (XPCS) 应用中的应用铺平了道路。研究了 MCP/Timepix 检测器的局部计数率饱和度，这需要优化特定散射模式的采集参数。开发了一种单光子聚类分析算法，以消除探测器中的电荷扩散效应，并将空间分辨率提高到子像素值。这些实验的结果将指导针对软 X 射线光子计数应用优化的未来 MCP 设备的持续开发，这将使 XPCS 动力学测量低至亚微秒时间尺度。研究了 MCP/Timepix 检测器的局部计数率饱和度，这需要优化特定散射模式的采集参数。开发了一种单光子聚类分析算法，以消除探测器中的电荷扩散效应，并将空间分辨率提高到子像素值。这些实验的结果将指导针对软 X 射线光子计数应用优化的未来 MCP 设备的持续开发，这将使 XPCS 动力学测量低至亚微秒时间尺度。研究了 MCP/Timepix 检测器的局部计数率饱和度，这需要优化特定散射模式的采集参数。开发了一种单光子聚类分析算法，以消除探测器中的电荷扩散效应，并将空间分辨率提高到子像素值。这些实验的结果将指导针对软 X 射线光子计数应用优化的未来 MCP 设备的持续开发，这将使 XPCS 动力学测量低至亚微秒时间尺度。

更新日期：2021-07-24

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