PHOTON SCIENCE

The FLASH facility has two undulator lines, FLASH1 and FLASH2, which provide FEL beam to users simultaneously with largely independent  photon beam parameters. In their respective experimental halls, a photon beam transport system delivers the FEL pulses to one of the experimental stations at a time by switching between photon beamlines using a set of plane mirrors. In order to use each FEL beam most efficiently, several experiments are set up at the same time at different endstations.  Usually, one experiment is online for a few days up to one week and then the beam is switched to another station.

The photon beam parameters of the FEL pulses vary due to the stochastic nature of the SASE process. A suite of photon diagnostics is available to determine the pulse parameters on a shot-to-shot basis.

FLASH1 provides four experimental stations in the FLASH experimental hall 'Albert Einstein', in building 28c. The direct “non-monochromatized” beam is delivered to the beamlines BL1 and BL3 (Beamline BL2 has been decommissioned).  BL1 offers the permanent end station CAMP. A THz beamline can be combined with BL3 and supplies synchronized pulses from the THz to infrared spectral range. The beamlines PG1 and PG2 are equipped with a high-resolution monochromator selecting a narrow spectrum of the FEL pulse. PG1 has a permanent user endstation featuring a XUV Raman spectrometer for time-resolved RIXS experiments.

FLASH2 will offer up to six experimental stations in the FLASH experimental hall 'Kai Siegbahn', in building 28k. Since spring 2016, the beamlines FL24 and FL26 are available for users. At FL26  the permanent end station REMI, a reaction microscope from the MPIK Heidelberg, is set up. The new pulse-length preserving monochromator beamline FL23 saw first light at the beginning of 2023 and has then been commissioned. A first FLASH in-house user experiment on single-shot ptychography has been successfully conducted end of 2023 and three more user experiments in the first half of 2024.  In addition to the user beamlines FLASH2 has three beamlines dedicated to FEL diagnostics. The open port beamline FL21 (hosting the THz streaking pulse duration diagnostics till 2024) is used for inhouse testing of new photon diagnostics components. FL22 is equipped with a grating spectrometer and FL28 is currently set up as new pulse duration diagnostic endstation for few fs pulses.

The beamlines are complemented by a suite of faciity-operated endstation instruments tailored to cover a broad range of user experiments.

Optical laser systems, synchronized to the FEL, are routinely provided for pump−probe experiments at all beamlines.  For FEL pump−FEL probe experiments we also have split&delay units at most of our beamlines.

CONTACTS FOR BEAMLINES

Rolf Treusch E-Mail: Rolf Treusch Phone: +49 (0)40 8998 (9)2693 Location: 28k / O2.007 General Contact / FLASH Experiments Coordinator

Benjamin Erk E-Mail: Benjamin Erk Phone: +49 (0)40 8998 (9)6237 Location: 49 / 112 Contact for Beamline BL1 / CAMP

Rui Pan E-Mail: Rui Pan Phone: +49 (0)40 8998 (9)4526 Location: 49 / 115 Contact for Beamline BL3 and for THz-Beamline @BL3

Sven Toleikis E-Mail: Sven Toleikis Phone: +49 (0)40 8998 (9)3827 Location: 49 / 105 2nd contact for Beamlines BL3 and FL24

Siarhei Dziarzhytski E-Mail: Siarhei Dziarzhytski Phone: +49 (0)40 8998 (9)6187 Location: 28k / O2.022 Contact for Beamline PG1 (and PG2)

Günter Brenner E-Mail: Günter Brenner Phone: +49 (0)40 8998 (9)4527 Location: 28k / O2.022 Contact for Beamline PG2 (and PG1) and for Beamline FL23

Marion Kuhlmann E-Mail: Marion Kuhlmann Phone: +49 (0)40 8998 (9)5748 Location: 28k / O2.008 Contact for Beamline FL24

Ulrike Frühling E-Mail: Ulrike Frühling Phone: +49 (0)40 8998 5788 Location: 28k / O2.018 Contact for Beamline FL26