New Linac Based FEL Projects using Bright Electron Beams
J. Rossbach
Deutsches Elektronen-Synchrotron, DESY, 22603 Hamburg, Germany
Abstract
Due to the progress of accelerator technology during the last years it is now possible to consider the construction of a Free Electron Laser (FEL) that provides coherent radiation at wavelengths very far below the visible. Various projects will be mentioned in this talk which are under way to establish the Self-Amplified Spontaneous Emission (SASE) principle at very short photon wavelength as well as multiple harmonic generation.
With respect to linac technology, the key prerequisite for such single-pass, high-gain FELs is a high intensity, diffraction limited electron beam to be generated and accelerated without degradation. Key components are RF guns with photocathodes, bunch compressors, and related diagnostics.
Once proven in the micrometer to nanometer regime, the SASE FEL scheme is considered applicable down to Angstrom wavelengths. It is pointed out that this latter option is particularly of interest in context with the construction of a linear collider, which requires very similar beam parameters.
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sln 29 March 1996
Conference