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Synchronized beamline at FLASH2 based on high-order harmonic generation for two-color dynamics studies.

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  • 1Institut für Quantenoptik, Leibniz Universität Hannover, Hannover 30167, Germany.

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A new vacuum ultraviolet (VUV) beamline at the FLASH free-electron laser (FEL) enables ultrafast studies. This novel system uses high-order harmonic generation (HHG) for atomic and molecular dynamics research.

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Area of Science:

  • Atomic and Molecular Physics
  • Ultrafast Science
  • Synchrotron Radiation and FELs

Background:

  • The Free-Electron Laser FLASH facility requires advanced beamlines for cutting-edge research.
  • Investigating ultrafast dynamics in atomic and molecular systems necessitates tunable, ultrashort light sources.

Purpose of the Study:

  • To design, integrate, and operate a novel vacuum ultraviolet (VUV) beamline at the FLASH facility.
  • To couple ultrashort VUV pulses (10-40 eV) generated by high-order harmonic generation (HHG) with the FEL.
  • To enable time-resolved studies of ultrafast dynamics using a reaction microscope (REMI) endstation.

Main Methods:

  • Installation of a novel VUV beamline (FL26) at the FLASH FEL.
  • Utilizing high-order harmonic generation (HHG) in gas, driven by a synchronized optical laser.
  • Coupling the HHG source with the FEL and integrating a reaction microscope (REMI) endstation.
  • Implementing a compact and reliable interface system to manage vacuum requirements.

Main Results:

  • Successful commissioning and operation of the VUV beamline.
  • Achieved a focused VUV beam size of approximately 20 µm at the REMI endstation.
  • Demonstrated proof-of-principle photo-electron momentum measurements in argon.

Conclusions:

  • The novel VUV beamline is successfully integrated and operational at FLASH.
  • The beamline is capable of supporting advanced time-resolved ultrafast dynamics studies.
  • The system shows potential for future two-color pump-probe experiments.