Electron energy spectral measurements in the large-slippage regime

W. A. Gillespie, A.M. MacLeod, P.F. Martin, G.M.H. Knippels, A.F.G. van der Meer, E.H. Haselhoff, P.W. van Amersfoort

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    Time resolved electron spectra have been measured at FELIX while lasing in the 8-30 µm range. Over this wavelength range the slippage, given by the longitudinal coupling parameter, µ = N? s, varies considerably (0.5 <µ <3). Limit-cycle behaviour, previously observed in optical spectra [1], is also evident in the electron spectra. Efficiencies of up to 1.6% have been measured. In these cases the output electron energy distribution has a total width of more than 14%! Also presented are measurements of the electron and optical spectra in the case when the electron energy is swept at a rate of 0.3%/µs while lasing at 30 µm.
    Original languageEnglish
    Pages (from-to)232-235
    Number of pages4
    JournalNuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectometers, Detectors and Associated Equipment
    Issue number1-3
    Publication statusPublished - 11 Apr 1995


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