Double-grating monochromatic beamline with ultrafast response for FLASH2 at DESY

The preliminary design of a monochromatic beamline for FLASH2 at DESY is presented. The monochromator is tunable in the 50 – 1000   eV energy range with resolving power higher than 1000 and temporal response below 50   fs over the whole energy range. A time-delay-compensated configuration using the variable-line-spacing monochromator design with two gratings is adopted: the first grating disperses the radiation on its output plane, where the intermediate slit performs the spectral selection; the second grating compensates for the pulse-front tilt and for the spectral dispersion due to diffraction from the first grating.

Source: Journal of Synchrotron Radiation - December 14, 2017 Category: Physics Authors: Poletto, L. Frassetto, F. Brenner, G. Kuhlmann, M. Pl ö njes, E. Tags: time-delay-compensated monochromator diffraction variable-line-spaced grating free-electron laser research papers Source Type: research