Heimann Philip, Reid Alexander, Feng Yiping, Fritz David
Linac Coherent Light Source, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025, USA.
J Synchrotron Radiat. 2019 Mar 1;26(Pt 2):358-362. doi: 10.1107/S1600577519001802. Epub 2019 Feb 22.
For LCLS-II, a fluorescence intensity monitor for the non-invasive, pulse-by-pulse normalization of experiments has been developed. A prototype diagnostic was constructed with a microchannel plate assembly and two photodiodes. The diagnostic was then installed in the LCLS SXR instrument Kirkpatrick-Baez mirror chamber with the detectors located above the vertically reflecting mirror. The linearity, noise and position sensitivity of the detectors have been characterized. The photodiode responsivity is suitable for high pulse energies. The microchannel plate detector shows sufficient responsivity over a wide range of pulse energies. The relative signal from the two photodiodes provides a sensitive measure of the X-ray beam position. The fluorescence intensity monitor provides intensity normalization while being compatible with high incident power, a 0.93 MHz repetition rate and ultra-high vacuum.
对于直线加速器相干光源二期（LCLS-II），已开发出一种用于实验的非侵入式逐脉冲归一化的荧光强度监测器。使用微通道板组件和两个光电二极管构建了一个诊断原型。然后将该诊断设备安装在直线加速器相干光源软X射线（SXR）仪器的柯克帕特里克-贝兹镜室中，探测器位于垂直反射镜上方。已对探测器的线性、噪声和位置灵敏度进行了表征。光电二极管的响应度适用于高脉冲能量。微通道板探测器在很宽的脉冲能量范围内显示出足够的响应度。两个光电二极管的相对信号提供了对X射线束位置的灵敏测量。该荧光强度监测器在与高入射功率、0.93兆赫兹重复率和超高真空兼容的同时，实现了强度归一化。
