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
Volume30
Number7
Pagination1635-1644
Date PublishedJul
ISBN Number0018-9197
Abstract

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.

DOI10.1109/3.299495
PID

c37a0b4e113574ce5e6239a3e472bef6

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