A Free Electron Laser Experiment
A Free Electron Laser (FEL) device is a source of high power, coherent electromagnetic radiation that can be tuned to operate from cm to visible wavelengths. The radiation is generated by scattering an external electromagnetic wave or “pump” from an intense relativistic electron beam. The coherence of the radiation is due in part to the axial self-bunching of the beam in the presence of the pump. The FEL operates in different regimes depending on the magnitude of the macroscopic system parameters. For extremely intense electron beams collective effects may play a dominant role in the dynamics of the system [collective regime]. This is to be contrasted for example with the case of extremely energetic, but low intensity electron beams where single particle effect dominate the behavior [Compton regime]. Other macroscopic parameters that determine the regime of operation include the electron beam energy spread (ΔE), the pump amplitude (Ip) and wavelength (λw), and the length (L) of the system.
KeywordsFree Electron Laser Macroscopic Parameter Efficiency Enhancement Pump Field Beam Voltage
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