CERN Accelerating science

Article
Title	An Analysis of Spontaneous Emission in Free-Electron Laser
Author(s)	Jia, Q K
Affiliation	(USTC/NSRL, Hefei, Anhui)
Publication	2005
In:	27th International Conference on Free Electron Lasers, Palo Alto, CA, USA, 21 - 26 Aug 2005, pp.e-proc. TUPP021
Subject category	Accelerators and Storage Rings
Abstract	The formula of spontaneous emission in free-electron laser is derived from the one dimensional Maxwell equation in the time domain. The effective start-up noise power of Self-Amplified Spontaneous Emission (SASE) process is given, it includes the incoherent spontaneous emission contribution, which is equal to the spontaneous undulator radiation in the first power gain length, and it also includes the coherent spontaneous emission contribution. The short pulse case is analysed.