一种用于同步辐射X射线束快速时间分辨监测的紧凑型光纤耦合有源光束阻挡器
A compact fibre-coupled active beamstop for fast time-resolved monitoring of synchrotron X-ray beams
- Max Planck Institute for the Structure and Dynamics of Matter（马普物质结构与动力学研究所）
- European Molecular Biology Laboratory (EMBL)（欧洲分子生物学实验室）
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AI总结：
本研究开发了一种紧凑型光纤耦合有源光束阻挡器，用于同步辐射衍射中直接X射线束的拦截与快速时间分辨监测，实现了束团信号检测和定时同步。
AI中文摘要：
我们开发了一种紧凑型光纤耦合有源光束阻挡器，用于在同步辐射衍射实验中同时拦截直接X射线束并进行时间分辨监测。完整的光束阻挡器尖端最大横向尺寸为1毫米，并包含一个700微米宽的Ce:YAG闪烁体。该闪烁体将拦截的X射线转换为可见光，通过多模光纤传输至刀片底部的硅光电二极管，该光电二极管连接到专用的快速放大电子设备。使用脉冲激光进行的测试得出系统衰减时间为69.4纳秒，与报道的Ce:YAG发光衰减时间一致。在PETRA III的P14.EH2终端站进行的测量表明，在40束团运行模式下，能够检测到间隔为192纳秒的单个束团信号。该有源光束阻挡器还提供了原位定时信号，用于将实验序列与机械X射线斩波器约190微秒的透射窗口同步。因此，该装置将直接光束的紧凑遮挡与衍射数据采集期间X射线定时和通量的快速监测相结合。
英文摘要：
We have developed a compact fibre-coupled active beamstop for simultaneous interception and time-resolved monitoring of the direct X-ray beam in synchrotron diffraction experiments. The complete beamstop tip has a maximum transverse dimension of 1 mm and incorporates a 700 $μ$m-wide Ce:YAG scintillator. The scintillator converts the intercepted X-rays into visible light, which is transported through a multimode optical fibre to a silicon photodiode at the bottom of the blade that is connected to a dedicated fast amplifier electronics. Tests with a pulsed laser yielded a system decay time of 69.4 ns, consistent with reported luminescence decay times for Ce:YAG. Measurements at the P14.EH2 end station of PETRA III demonstrated the detection of individual bunch signals separated by 192 ns in the 40-bunch operating mode. The active beamstop also provided an in-situ timing signal for synchronising an experimental sequence with the approximately 190 $μ$s transmission window of a mechanical X-ray chopper. The device therefore combines a compact obstruction of the direct beam with fast monitoring of X-ray timing and flux during diffraction data acquisition.
