FLASH at DESY
FLASH1 - PG1

The PG1 monochromator beamline branch houses the XUV RIXS spectrometer (named TRIXS) as a permanent experimental end-station for RIXS studies on solid samples. The instrument is designed to cover the photon energy range from 36 - 200 eV with a spectral resolving power of ~1700. The TRIXS spectrometer end-station effectively operates with two reflective off-axial parabolic mirrors and a plane-grating unit, making use of the same SX 700 type monochromator as PG2.  Kirkpatrick-Baez (KB) refocusing optics produces a fixed FEL microfocus of 5 μm (vertically) at the sample position. The facilities optical pump-probe laser is coupled to the TRIXS end-station thus allowing for time-resolved resonant inelastic X-ray scattering studies on solid samples at FLASH.The total time-resolution of the instrument for time-resolved RIXS studies in the above mentioned energy range is 170 - 300 fs FWHM.

Endstations or Setup

TRIXS spectrometer

Description
XUV RIXS spectrometer as permanent end-station. For more detailed information on the working principle please refer to Dziarzhytski et al. Struct. Dyn. 7, 054301 (2020); https://doi.org/10.1063/4.0000029
Spectrometer
XUV RIXS spectrometer covering the photon energy range of 36-200 eV with resolving power of approx. 1700 and femto-second FEL synchronized optical laser for pump-probe experiments.
Base Pressure
1 * 10-8 [mbar]
Endstation Operative
Yes

Sample

Sample Type
Crystal
Other Sample Type
solid sample
Mounting Type
Sample holder which can be introduced to the sample chamber via a load lock. Sample position adjustable employing a goniometer installed inside the UHV sample chamber.
contacts
Siarhei Dziarzhytski
Techniques
Absorption
  • NEXAFS
  • Time-resolved studies
Emission or Reflection
  • Reflectrometry
  • X-ray fluorescence (XRF)
Scattering
  • Inelastic scattering
  • Time-resolved scattering
Disciplines
Material Sciences
  • Other - Material Sciences
Physics
  • Dynamics
  • Hard condensed matter - electronic properties
  • Hard condensed matter - structures
  • Surfaces, interfaces and thin films
Address
Notkestra├če 85
Building 28c (FLASH1 Hall)
22607 Hamburg
control/Data analysis
Control Software Type
  • To control the beamline and the photon diagnostics tools provided by FLASH we have a visualization software called "jddd". This can be used to move screens, motors, etc. and to visualize pulse energy, XUV spectra, ADC traces... and it provides information about the status of the beamline and diagnostics. The underlying FLASH control system is a DESY specific system called "DOOCS". Interfaces for python (and Matlab) are existing to allow read and write access for user scripts to DOOCS controlled parameters.

    [http://www.desy.de/~wwwuser/index.html][Link to general information on the FLASH control system and DAQ]
Data Output Type
  • There are two different approaches possible. The "online" reading of the data stream by python (or Matlab) with the provided API or the "semi online" and offline data analysis using HDF5 files containing user data and all relevant FEL parameters. See FLASH documentation for details.
Data Output Format
  • HDF5
Softwares For Data Analysis
  • A data base for python (and Matlab) scripts is currently build up.