Optimizing x-ray optics for modulating x-ray beams with MEMS devices

摘要

We have used microelectromechanical systems (MEMS) to dynamically modulate synchrotron x-ray beams. Byoscillating a small silicon crystal at 10s to 100s of kHz, we have demonstrated that the “time window” in which theBragg condition is satisfied, and thus the time in which an x-ray pulse can be deflected by diffraction, can besignificantly less than 1 ns. Here we discuss the optimization of x-ray optics to further improve device performance. Weshow that the time window can be reduced by matching the dispersion of a monochromator crystal to that of the MEMScrystal. We consider the case of an ideally perfect crystal and also treat the effects of strain and curvature, either ofwhich broadens the crystal rocking curve and thus degrades the time window. A careful understanding of the effects ofdispersion and x-ray wavelength produces time windows approaching the typical synchrotron pulse duration.