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FELBE is an acronym for the free-electron laser (FEL) at the Electron Linear accelerator with high Brilliance and Low Emittance (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)
Wavelength- range | 4 - 22 μm 18 - 250 μm | |
Pulse energy | 0.01 - 2 μJ | depending on wavelength |
Pulse length | 1 - 25 ps | depending on wavelength |
Repetition rate | 13 MHz | 3 modes:
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