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Phase-locked MHz pulse selector for x-ray sources

机译：用于X射线源的锁相MHz脉冲选择器

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Picosecond x-ray pulses are extracted with a phase-locked x-ray pulse selector at 1.25 MHz repetition rate from the pulse trains of the accelerator-driven multiuser x-ray source BESSY II preserving the peak brilliance at high pulse purity. The system consists of a specially designed in-vacuum chopper wheel rotating with approximate to 1 kHz angular frequency. The wheel is driven in an ultrahigh vacuum and is levitated on magnetic bearings being capable of withstanding high centrifugal forces. Pulses are picked by 1252 high-precision slits of 70 mu m width on the outer rim of the wheel corresponding to a temporal opening window of the chopper of 70 ns. We demonstrate how the electronic phase stabilization of +/- 2 ns together with an arrival time jitter of the individual slits of the same order of magnitude allows us to pick short single bunch x-ray pulses out of a 200 ns ion clearing gap in a multibunch pulse train as emitted from a synchrotron facility at 1.25 MHz repetition rate with a pulse purity below the shot noise detection limit. The approach is applicable to any high-repetition pulsed radiation source, in particular in the x-ray spectral range up to 10 keV. The opening window in a real x-ray beamline, its stability, as well as the limits of mechanical pulse picking techniques in the MHz range are discussed. (C) 2015 Optical Society of America
机译：使用锁相X射线脉冲选择器以1.25 MHz重复频率从加速器驱动的多用户X射线源BESSY II的脉冲序列中提取皮秒X射线脉冲，从而在高脉冲纯度下保持峰值亮度。该系统由经过特殊设计的真空斩波轮组成，该斩波轮以大约1 kHz的角频率旋转。车轮在超高真空下驱动，并悬浮在能够承受高离心力的磁性轴承上。脉冲由轮的外缘上70毫米宽的1252个高精度狭缝拾取，与70 ns的斩波器的时间打开窗口相对应。我们展示了+/- 2 ns的电子相位稳定度以及相同数量级的各个狭缝的到达时间抖动如何使我们能够从200 ns的离子清除间隙中挑选出短的单束X射线脉冲从同步加速器设施以1.25 MHz重复频率发射的多束脉冲序列，脉冲纯度低于散粒噪声检测极限。该方法适用于任何高重复脉冲辐射源，特别是在高达10 keV的X射线光谱范围内。讨论了真实X射线束线中的打开窗口，其稳定性以及在MHz范围内的机械脉冲采集技术的局限性。 （C）2015年美国眼镜学会

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