Optimum injection momentum for electrons in vacuum laser accelerationL. Zheng1, P. X. Wang1, Z. Chen1, Q. Kong1, Y. K. Ho1 and S. Kawata2
1 Applied Ion Beam Physics Laboratory, Key Laboratory of the Ministry of Education, Institute of Modern Physics, Fudan University - Shanghai, 200433, China
2 Department of Electrical and Electronic Engineering, Utsunomiya University - Utsunomiya, Japan
received 22 February 2008; accepted in final form 29 April 2008; published June 2008
published online 3 June 2008
Using numerical simulation, injection conditions for the electron in vacuum laser acceleration are studied. The results show that different distribution of injection momentum in the longitudinal and transversal direction will drastically influence the interaction process, and there exists a gap in the frontier area qualified for acceleration. The results for different beam widths show that the gap always exists. This gap corresponds to the valley appearing in the profile of the ejection-energy/injection-angle curve (J. Phys. B, 39 (2006) 1353). Associated with the initial conditions of the interaction system, the characteristic of the ejection-energy/injection-angle curve is also analyzed.
41.75.Jv - Laser-driven acceleration.
42.65.-k - Nonlinear optics.
© EPLA 2008