Author/Authors :
Gillespie، نويسنده , , W.A. and MacLeod، نويسنده , , A.M. and Martin، نويسنده , , P.F. and Knippels، نويسنده , , G.M.H and van der Meer، نويسنده , , A.F.G. and Haselhoff، نويسنده , , E.H. and van Amersfoort، نويسنده , , P.W.، نويسنده ,
Abstract :
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, μc = N λ/σe, varies considerably (0.5 < μc < 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.
