STATISTICAL PROPERTIES OF THE RADIATION FROM SASE FEL OPERATING IN THE LINEAR REGIME

The paper presents comprehensive analysis of statistical properties of the radiation from self amplified spontaneous emission (SASE) free el ectron laser operating in linear mode. The investigation has been perf ormed in a one-dimensional approximation, assuming the electron pulse length to be much larger than a coherence length of the radiation. The following statistical properties of the SASE FEL radiation have been studied: field correlations, distribution of the radiation energy afte r monochromator installed at the FEL amplifier exit and photoelectric counting statistics of SASE FEL radiation. It is shown that the radiat ion from SASE FEL operating in linear regime possesses all the feature s corresponding to completely chaotic polarized radiation. (C) 1998 El sevier Science B.V. All rights reserved.