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Electron bunch acceleration and trapping by ponderomotive force of an intense short-pulse laser

Published online by Cambridge University Press:  02 June 2005

SHIGEO KAWATA
Affiliation:
Department of Electrical and Electronic Engineering, Utsunomiya University, Utsunomiya, Japan
QING KONG
Affiliation:
Institute of modern physics, Fudan University, Shanghai, China
SHUJI MIYAZAKI
Affiliation:
Department of Electrical and Electronic Engineering, Utsunomiya University, Utsunomiya, Japan
KOHICHI MIYAUCHI
Affiliation:
Department of Electrical and Electronic Engineering, Utsunomiya University, Utsunomiya, Japan
RYO SONOBE
Affiliation:
Department of Electrical and Electronic Engineering, Utsunomiya University, Utsunomiya, Japan
KEI SAKAI
Affiliation:
Department of Electrical and Electronic Engineering, Utsunomiya University, Utsunomiya, Japan
KAZUHISA NAKAJIMA
Affiliation:
High Energy Accelerator Research Organization, Ibaraki, Japan
SHINICHI MASUDA
Affiliation:
High Energy Accelerator Research Organization, Ibaraki, Japan
Y.K. HO
Affiliation:
Institute of modern physics, Fudan University, Shanghai, China
NORIAKI MIYANAGA
Affiliation:
Institute of Laser Engineering Osaka University, Osaka, Japan
JIRI LIMPOUCH
Affiliation:
Institute of Physics and Czech Technical University, Academy of Sciences of the Czech Republic, Praha, Czech Republic
A.A. ANDREEV
Affiliation:
Research Institute for Laser Physics, Scientific Center, “S.I.Vavilov State Optical Institute”, St. Petersburg, Russia

Abstract

Electron ponderomotive acceleration in a vacuum by a short-pulsed laser of TEM (1, 0) + TEM (0, 1) mode is studied in this paper using a 3-dimensional (3D) particle simulation. It was found that the laser can trap electrons in transverse and accelerate them with the longitudinal ponderomotive force at the same time. Through this electron trapping and acceleration scheme of TEM (1, 0) + TEM (0, 1) mode laser, the electron bunch is confined well in transverse and compressed remarkably in longitudinal. Therefore, a high energy, high density, and low emittances electron bunch is generated. For example, the result shows that for a laser with intensity of a0 = eE0 /mωc = 10, the laser spot size of w0 = 15λ, and the laser pulse length of Lz = 10λ, the maximum energy gain reaches 301 MeV and the average energy 57.7 MeV. The electron bunch transverse radius is about 350λ and the longitudinal size about 20λ. The property of this accelerated bunch is improved compared with that generated by the laser of TEM (0, 0) mode.

Type
Research Article
Copyright
2005 Cambridge University Press

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