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Nishimori, Nobuyuki
Nuclear Instruments and Methods in Physics Research A, 528(1-2), p.34 - 38, 2004/08
Times Cited Count：1 Percentile：10.3(Instruments & Instrumentation)The sustained saturation in an FEL oscillator at zero detuning of an optical cavity (
=0) is studied analytically. The FEL field at =0 is characteristic of self-amplified spontaneous emission (SASE) FEL. For both cases, the field is composed of the forward incoherent and subsequent coherent states. The coherent field at =0 evolves with round trips due to the lethargy. The field at saturation is similar to that of the leading edge of SASE FEL with high electron beam density. It is found that the peak intensity and the pulse length of the saturation field scale with fundamental FEL parameter and an optical cavity loss.
Nishimori, Nobuyuki
Proceedings of 1st Annual Meeting of Particle Accelerator Society of Japan and 29th Linear Accelerator Meeting in Japan, p.174 - 176, 2004/08
no abstracts in English
Nishimori, Nobuyuki
Proceedings of 26th International Free Electron Laser Conference (FEL 2004) and 11th FEL Users Workshop (CD-ROM), p.41 - 44, 2004/00
The phase space evolution of electrons in a self-amplified spontaneous emission (SASE) FEL operating in the linear regime before saturation is solved analytically from the one dimensional (1D) FEL equaiton. The analytical solution agrees well with a time-dependent numerical simulation which solves the 1D FEL equation in an exact manner and includes a shot-noise effect. The radiation field reaches saturation when the optimum bunching of the electrons is formed on the scale of the resonant wavelength. The optimum bunching leads to the well known saturation condition 
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