PG Beamlines (FLASH1)

FLASH Beamlines

The Plane Grating (PG) Monochromator beamline at FLASH

The XUV monochromator beamline installed at FLASH is a high-resolution plane grating monochromator of SX 700 type which allows different classes of experiments to be performed in the fields of gas phase physics, magnetic spectroscopy, high resolution photoelectron spectroscopy, surface chemistry, soft x-ray diffraction and holography. The PG beamline layout permits a free choice of best compromise between photon flux and resolution. Thus, it 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.

The PG beamline has two branches: PG1 and PG2.

PG2 - 3m x 4m platform for user-provided endstation

  • high resolution plane grating XUV monochromator (SX 700 type, <10-4 bandwidth, DLC coated optics)
  • energy range 25 eV...275 eV (...900 eV with 3rd harmonic radiation)
  • ~50 μm focus at experiment
  • variable combination of photon flux and resolution (from high flux to high resolution)
  • controlled temporal-spectral properties at moderate resolution for pump-probe experiments
  • harmonic filtering
  • XUV Split- and Delay Unit with variable time delay (±6 ps) for time resolved studies see more
  • High-resolution spectrometer mode possible (>104 resolving power)
  • optional pump-probe experiments using FLASH1 optical laser system synchronized to x-ray pulses
  • photon pulse diagnostics and beam manipulation tools: GMD intensity monitors, beam position monitors, sets of filters and apertures, gas absorber, fast shutter
CONTACT PG2:
Brenner
Günter Brenner
E-Mail: Günter Brenner
Phone: +49 (0)40 8998 (9)4527
Location: 28k / O2.022

PG1 - TRIXS permanent endstation: RIXS spectrometer for Time-resolved Resonant X-Ray Scattering experiments

  • Makes use of the same SX 700 type monochromator as PG2
  • Kirkpatrick-Baez (KB) refocusing optics, FEL focal spot of 5 μm (vertically) at the sample
  • Energy range: 36-200 eV
  • Resolving power ~1700
  • Solid state samples
  • Optical pump-probe laser (1030nm plus SHG,THG) is coupled to the end-station thus allowing for time-resolved resonant inelastic X-ray scattering studies
  • Time-resolution: 170 - 300 fs FWHM
CONTACT PG1:
Dziarzhytski
Siarhei Dziarzhytski
E-Mail: Siarhei Dziarzhytski
Phone: +49 (0)40 8998 (9)6187
Location: 28k / O2.022

References:
M. Martins et al., Monochromator beamline for FLASH, Rev. Sci. Instrum. 77 , 115108 (2006). Article
N. Gerasimova et al., The monochromator beamline at FLASH: performance, capabilities and upgrade plans, J. Mod. Opt. 58, 1480 (2011). Article
S. Dziarzhytski et al., The TRIXS end-station for femtosecond time-resolved resonant inelastic x-ray scattering experiments at the soft x-ray free-electron laser FLASH, Struct. Dyn. 7, 054301 (2020). Article