Free-Electron Laser FLASH (FLASH)
Hamburg
FLASH, the Free-Electron LASer in Hamburg, started user operation in summer 2005 as the first free-electron laser for XUV and soft X-ray radiation. It is operated in the "self-amplified spontaneous emission" (SASE) mode and currently covers a wavelength range from 4 nm to about 52 nm in the first harmonic with GW peak power and pulse durations between 30 fs and 200 fs. FLASH1 offers four beamlines for users in the FLASH experimental hall 'Albert Einstein' (PG and BL beamlines).
In the past years, an additional FEL undulator line in a separate tunnel - FLASH2- and the new FLASH experimental hall 'Kai Siegbahn' have been built adjacent to the existing FLASH facility now called FLASH1. First lasing of FLASH2 was achieved in August 2014 in parallel to FLASH1. Now the FLASH facility at DESY comprises two separate and almost independent FEL sources. This upgrade enhances significantly the capacities for XUV and soft X-ray FEL users at DESY. FLASH2 will offer up to six experimental stations in the FLASH experimental hall 'Kai Siegbahn', in building 28k. Since spring 2016, the beamlines FL 24 and FL 26 are available for users. At FL 26 the permanent end station REMI, a reaction microscope from the MPIK Heidelberg, is set up.
| XUV - Photons | - | - |
|---|---|---|
| Number of Bunches per second+ | 1 - 8000 (delivered up to 5000 to users) | |
| Pulse Repetition Rates (within pulse train)+ | 40, 50, 100, 200, 250, 500, 1000 | kHz |
| Wavelength | 4.2 - 52 (FL1) / 4 - 90 (FL2) | nm |
| Photon Energy | 24 - 295 (FL1) / 14 - 310 (FL2) | eV |
| Pulse Duration (FWHM) | 30 - 200 (FL1) / <10 - 200 (FL2) | fs |
| Average Pulse Energy (single bunch)* | 1 - 500 | µJ |
| Average Pulse Energy (pulse trains)* | 1 - 200 | µJ |
| 3rd Harmonic Wavelength | down to 1.7 | nm |
| 3rd Harmonic Pulse Energy | typically 0.5 % of fundamental | |
| THz-Photons (at FLASH1) | ||
| Wavelength+ | 10 - 230 | µm |
| Photon Energy+ | 5 - 125 | meV |
| Photon frequency+ | 1.3 - 30 | THz |
| Average Pulse Energy* | 10 - 100 | µJ |
+ Depends on wavelength required
* Depends on the pulse length and wavelength required, please consult with beamline contacts
Source: https://photon-science.desy.de/facilities/flash/flash_parameters/index_eng.html
More information:
Publications
The FLASH Facility: Advanced Options for FLASH2 and Future Perspectives
Faatz B, Braune M, Hensler O, Honkavaara K, Kammering R, Kuhlmann M, Ploenjes E, Roensch-Schulenburg J, Schneidmiller E, Schreiber S, Tiedtke K, Tischer M, Treusch R, Vogt M, Wurth W, Yurkov M, Zemella J - Applied Sciences - 2017
The free-electron laser FLASH
Schreiber S, Faatz B - High Power Laser Science and Engineering - 2015
