Author/Authors :
Jaroszynski، نويسنده , , D.A. and Prazeres، نويسنده , , R. and Glotin، نويسنده , , F. and Ortega، نويسنده , , J.M. and Oepts، نويسنده , , D. and van der Meer، نويسنده , , A.F.G. and Knippels، نويسنده , , G. and van Amersfoort، نويسنده , , P.W.، نويسنده ,
Abstract :
We present an experimental and theoretical evaluation of a new method of enhancing the efficiency and gain of the free-electron laser (FEL) and observations of self-amplified spontaneous emission at start-up of the step-tapered FEL. The stepped undulator is divided into two uniform sections of different deflection strengths, the upstream K1 and the downstream K2, and a step of ΔK = K2 − K1 ≈ 0.03 with K1 < K2 for mid-infrared operation.
