The FL26 has been build up in a collaboration of the MPIK Heidelberg and DESY and features a reaction microscope REMI as a permanent endstation dedicated to AMO science applications. Using a coincident measurement technique, a complete set of all the kinematic properties of the products of the photoionization process can be determined in the experiment. This method greatly benefits from the unique high repetition rate at FLASH due to the burst mode operation.
In particular the temporal evolution of atomic and molecular processes can be investigated by means of pump-probe experimental schemes. XUV-XUV pump-probe experiments can be performed using an in-line split&delay focusing unit. Furthermore, two fully synchronized laser systems in the NIR and VUV range, respectively, will be available soon at this beamline, enabling multi-color pump-probe experiments.

XUV Split&delay focusing unit:

• 30nm carbon broadband mirror coating (T>75% in the wavelength range 9 - 41nm)
• Delay range        ± 2.7 ps
• Delay precision   1 fs
• Focal spot size    3 µm (FWHM)
  

Acceptance of the full FLASH2 parameter range:

• Number of Bunches per second          1 – 8000 (delivered up to 5000)
• Pulse Repetition Rates (within pulse train)    40, 50, 100, 200, 250, 500, 1000 kHz
• Pulse Duration (FWHM)                      10 – 300 fs (+single spike SASE option)
  
• Wavelength                                       3.5 – 90 nm
• Photon beam Energy                                  13.7 – 343 eV
• Average Pulse Energy                                0.5 – 500 µJ

Photon-diagnostics of FLASH2:

• photon beam energy  
• photon beam position
  
• Central wavelength monitoring