Software defined photon counting system for time resolved x-ray experiments.
Software defined photon counting system for time resolved x-ray experiments.
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DOI：
10.1063/1.2428274
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发表时间：
2007-01
期刊：
影响因子：
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通讯作者：
Y. Acremann;V. Chembrolu;John Paul Strachan;T. Tyliszczak;Joachim Stöhr
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文献类型：
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作者：
Y. Acremann;V. Chembrolu;John Paul Strachan;T. Tyliszczak;Joachim Stöhr
同步辐射的时间结构允许使用泵浦-探测方法进行时间分辨率低于100 ps的时间分辨实验。然而，与来自同步加速器的X射线脉冲的全重复率相比，样品的驰豫时间可能需要较低的泵浦脉冲重复率。仅使用紧跟在泵浦脉冲之后的X射线脉冲是不有效的，并且通常需要仅填充存储环的少数桶的特殊操作模式。我们设计了一种新颖的软件定义的光子计数系统，该系统可以在全重复频率下实现各种泵浦-探测方案。大量的光子计数器允许同时检测样品在多个时间延迟的响应，从而提高了实验的效率。该系统已成功应用于时间分辨扫描透射式X射线显微镜。然而，这项技术更适用于一般情况。
The time structure of synchrotron radiation allows time resolved experiments with sub-100 ps temporal resolution using a pump-probe approach. However, the relaxation time of the samples may require a lower repetition rate of the pump pulse compared to the full repetition rate of the x-ray pulses from the synchrotron. The use of only the x-ray pulse immediately following the pump pulse is not efficient and often requires special operation modes where only a few buckets of the storage ring are filled. We designed a novel software defined photon counting system that allows to implement a variety of pump-probe schemes at the full repetition rate. The high number of photon counters allows to detect the response of the sample at multiple time delays simultaneously, thus improving the efficiency of the experiment. The system has been successfully applied to time resolved scanning transmission x-ray microscopy. However, this technique is applicable more generally.