THEORETICAL COMPUTATIONS OF AMPLIFIED SPONTANEOUS EMISSION IN SG - 1 FEL

Based on SG-1 LIA FEL amplifier parameters, the ASE output power and gain, as well as their relationship with electron beam quantity including beam energy spread, emittance, and beam intensity etc.are simulated and analysed by using 3-D WAGFEL code. The related scaling law has been given. Mearwhile the influence of the wiggler magnetic field's random errors on ASE output and the experimental results are also analysed.