FL Beamlines (FLASH2)

FLASH2 hall

Photograph of the FLASH2 experimental hall 'Kai Siegbahn' (November 2017), with the laser transport beamline in the foreground and beamlines FL24 and FL26 in the background. At that time, the new beamline FL23 and all the laser safety tents did not exist.

FLASH2

Present layout (May 2024) of the infrastructure and the photon beamlines in the FLASH2 experimental hall 'Kai Siegbahn'. FL23, FL24 and FL26/REMI are user beamlines, while FL21 and FL28 are internal diagnostics beamlines. (SDU = Split&Delay Unit for FL23 and FL24, https://doi.org/10.1107/S1600577523000395 ).

FLASH2 will offer up to six additional photon beamlines in the new experimental hall 'Kai Siegbahn'. Photon beam parameters can be chosen almost independently for FLASH1 and FLASH2 by the users. FLASH2 has variable gap undulators and thus, the wavelength of FLASH2 can be chosen independent from FLASH1. In addition, fast tuning of the wavelength as well as wavelength scans are possible at FLASH2. Each undulator line has its own injector laser and thus bunch separation, number of bunches, and the bunch charge can be set independently for FLASH1 and FLASH2. Both undulator lines receive the full 10 Hz bunch train repetition rate, but each 800 microsecond long burst is split between FLASH1 and FLASH2. The fraction of bunches delivered to each beamline can be chosen freely. A new, much more flexible RF-system allows different compressions for FLASH1 and FLASH2, and therefore a different photon pulse length can be chosen by either user.


FL23 is a pulse-length preserving double-grating monochromator beamline providing an open-port variable micro-focus covering the FEL wavelength range of 1.2 – 20 nm (including FEL harmonics).

FL24 has an open port for user supplied end stations. FL24 covers the entire wavelength range of FLASH2 (see FLASH parameters) and is equipped with a KB bending mirror system for focussing.

FL26 features the permanent end station REMI - a reaction microscope from R. Moshammer's group at MPIK Heidelberg.





General CONTACT FL Beamlines:
(see specific contacts at the respective beamline pages)

Treusch
Rolf Treusch
E-Mail: Rolf Treusch
Phone: +49 (0)40 8998 (9)2693
Location: 28k / O2.007
Plönjes-Palm
Elke Plönjes-Palm
E-Mail: Elke Plönjes-Palm
Phone: +49 (0)40 8998 (9)2602
Location: 28k / O2.004

References:
B. Faatz, E. Plönjes et al., Simultaneous operation of two soft x-ray free-electron lasers driven by one linear accelerator, New J. Phys. 18, 062002 (2016). Article
Elke Plönjes et al., FLASH2: Operation, beamlines, and photon diagnostics, AIP Conf. Proc. 1741, 020008 (2016). Article