FLASH at DESY
FLASH1 - PG1

The PG1 monochromator beamline branch houses the XUV double stage RIXS spectrometer as a permanent experimental end-station for RIXS studies on solid samples. The instrument is designed to cover the photon energy range from 20 - 200 eV with high energy resolution of about 2 – 20 meV (design values in additive mode) and to suppress the elastic line and stray light.The RIXS spectrometer effectively operates with four reflective off-axial parabolic mirrors and two plane-grating units, 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 end-station thus allowing for time-resolved resonant inelastic X-ray scattering studies on solid samples at FLASH.

Endstations or Setup

RIXS spectrometer

Description
XUV double stage Raman spectrometer as permanent endstation. For more detailed information on the working principle please refer to Biednov et al. J. Synchrotron Rad. (2019). 26; https://doi.org/10.1107/S160057751801576X.
Spectrometer
XUV double stage Raman spectrometer covering the photon energy range of 20-200 eV with high energy resolution of 2-20 meV (design values in additive mode) and elastic line/stray light supression.
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
Scattering
  • Inelastic 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.