Short-Pulse Effects in a Free-Electron Laser

TitleShort-Pulse Effects in a Free-Electron Laser
Publication TypeJournal Article
Year of Publication1994
AuthorsR.J Bakker, D.A Jaroszynski, A.FG van der Meer, D. Oepts, P.W van Amersfoort
JournalIeee Journal of Quantum Electronics
Date PublishedJul
ISBN Number0018-9197

The Free-Electron Laser for Infrared eXperiments (FELIX) offers a unqiue combination of short electron bunches and long wavelengths, i.e., a slippage parameter A, ranging up to 10. As a consequence, pronounced short-pulse effects can be observed. In this paper the experimental observation of two of these effects is discussed, namely the occurrence of limit-cycle oscillations and the feasibility of tuning of the micropulse duration. The stable limit-cycle oscillation of the macropulse power is due to a modulation of the optical micropulse shape. This is a consequence of a combination of high optical power and short pulses. The former causes synchrotron oscillations of the electrons and the effect is, therefore, closely related to spiking phenomena. The short-pulse nature of FELIX ensures that the oscillations do not evolve into the chaotic behavior normally associated with spiking and the sideband instability. Experimental results are compared with numerical simulations.



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