Free-Electron Lasers at the ELBE - Center for High-Power Radiation Sources at the HZDR in Dresden-Rossendorf FELBE is an acronym for the free-electron laser ( FEL ) at the E lectron L inear accelerator with high B rilliance and Low E mittance ( ELBE ) located at the Forschungszentrum Dresden-Rossendorf, Germany. The heart of ELBE is a superconducting linear accelerator operating in cw mode with a pulse repetition rate of 13 MHz. The acceleration is performed in two superconducting units with 20 MV each. The average beam current is 1 mA. The electron beam is guided to several laboratories where secondary beams (particle and electromagnetic) are generated ( → details ). Two free-electron lasers ( U27-FEL and U100-FEL ), produce coherent electromagnetic radiation in the mid and far infrared (4 - 250 μm). Pulse energies are in the few 100 nJ range with pulse duration of a few picoseconds. The typical operation mode offers 13 MHz micropulse repetition rate, in macropulses of a few 100 μs at up to 25 Hz or, alternatively, FEL operation in a continuous 13 MHz mode. The two free-electron lasers U27-FEL and U100-FEL with the undulators, U27 and U100 , produce intense, coherent infrared radiation, which is tunable over a wide wavelength range by changing the electron energy or the undulator magnetic field. ( → FEL description , → FELs worldwide ) Parameters of the FEL radiation Wavelength- range 4 - 22 μm 18 - 250 μm U27-FEL with undulator U27 U100-FEL with undulator U100 Pulse energy 0.01 - 2 μJ depending on wavelength Pulse length 1 - 25 ps depending on wavelength Repetition rate 13 MHz 3 modes: cw macropulsed 100 μs, 25 Hz single-pulse switched at kHz/Hz As a user facility FELBE is open for external users.
标签: Free-Electron
