Soft X-ray spectroscopy of clusters, surfaces and interfaces

UNIEXP

Research

FEL Physics and Instrumentation Development

FLASH - Plane grating monochromator beamline ·

FLASH - Plane grating monochromator beamline

A plane grating monochromator (PG) beamline was developed for the soft X-ray free-electron laser FLASH to combine the ultra-short pulses of extreme brilliance generated from the self-amplified stimulated emission (SASE) process with very low photon energy bandwidths which are essential for experiments which require a high spectral resolution. [1]

Layout of the PG2 monochromator beamline at FLASH I. Reproduced from Martins et. al., Rev. Sci. Instr. 77, 115108 (2006), with the permission of AIP Publishing.

The monochromator beamline allows for resoving powers E/ΔE between 10000 and 70000 depending on the initial photon energy. The wide photon energy range from 20eV to 1000eV of the two mounted gratings also allows selecting the higher harmonics of the FEL beam.

[1] Martins et. al., Rev. Sci. Instr. 77, 115108 (2006)