The XUV monochromator
beamline installed at FLASH is a high-resolution plane grating
(PG) monochromator of SX 700 type working over the energy range from 25eV...275eV (FEL fundamental) with an open port for user-provided experimental setups (3m x 4m platform space). The beamline layout
permits a free choice of best compromise between photon flux and
resolution (<104 bandwidth, DLC coated optics). Furthermore, it can transport the harmonic FEL radiation up to ~900eV with reduced intensity. Typical focus size at the experiment are in the range of 50-100 microns.
A XUV Split- and Delay Unit with variable time delay (±6 ps) for time resolved studies is incorporated in the beamline. Optional pump-probe experiments using the FLASH1 optical laser system synchronized to the x-ray pulses are possible. A high-resolution spectrometer mode (>104 resolving power)
allows to characterize the spectral properties of the FEL pulses and the temporal-spectral properties can be controlled at moderate resolution for pump-probe experiments. Standard photon pulse diagnostics and beam manipulation tools like, e.g. GMD intensity
monitors, beam position monitors, sets of filters and apertures, gas
absorber and a fast shutter are available. Thus, The PG2 monochramator beamline provides enough flexibility over the broad
parameter range of FLASH to enable high resolution applications,
pump-probe experiments with control over the temporal-spectral
properties at moderate resolution, and high photon flux experiments with
the option of harmonic filtering.