CERN Accelerating science

Article
Title	Generation of Small Energy Spread Electron Beam from Self-Modulated Laser Wakefield Accelerator
Author(s)	Kim, Changbum ; Hafz, Nasr ; Kim, Guang-Hoon ; Soo Ko In ; Suk, Hyyong
Affiliation	(KERI, Changwon) ; (POSTECH, Pohang, Kyungbuk)
Publication	2005
In:	21st IEEE Particle Accelerator Conference, Knoxville, TN, USA, 16 - 20 May 2005, pp.976
Subject category	Accelerators and Storage Rings
Abstract	Laser and plasma based accelerators have been studied for a next generation particle accelerator. Still, there are some problems to solve for real applications. For example, it has been observed that the accelerated electron beam from laser and plasma based accelerators has a 100% energy spread. Thus, the generation of small energy spread beam is an important issue in the laser and plasma based accelerator study. In this work, we introduce a method to control the energy spread. From a basic theory and simulation, it is found that the transverse electron distribution is changed from the Gaussian to a Maxwell-Boltzmann distribution and low energy electrons spread out more rapidly than high energy electrons as they propagate in vacuum. Thus, a small size collimator is installed to remove the small energy electrons and it is conformed that the small energy spread can be obtained from an experiment.