A high-gain klystron FEL based on self-amplified spontaneous emission

초록

As a promising candidate for a high-gain free-electron laser (FEL) at wavelengths far below the visible, we propose a klystron FEL amplifier based on the self-amplified spontaneous emission (SASE) principle. The klystron configuration is expected to improve the small signal gain and to reduce the FEL's undulator length. With one-dimensional, time-dependent computer simulations, we have investigated the pulse propagation effect in the dispersive section and the gain-limiting effect of the electron beam. The gain enhancement, the reduction of the saturation length, and the effect of the beam-energy spread have been thoroughly investigated and compared with the corresponding results for a conventional FEL.

키워드