Laser and Particle Beams



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


SHIGEO  KAWATA  a1 c1 , QING  KONG  a3 , SHUJI  MIYAZAKI  a1 , KOHICHI  MIYAUCHI  a1 , RYO  SONOBE  a1 , KEI  SAKAI  a1 , KAZUHISA  NAKAJIMA  a2 , SHINICHI  MASUDA  a2 , Y.K.  HO  a3 , NORIAKI  MIYANAGA  a4 , JIRI  LIMPOUCH  a5 and A.A.  ANDREEV  a6
a1 Department of Electrical and Electronic Engineering, Utsunomiya University, Utsunomiya, Japan
a2 High Energy Accelerator Research Organization, Ibaraki, Japan
a3 Institute of modern physics, Fudan University, Shanghai, China
a4 Institute of Laser Engineering Osaka University, Osaka, Japan
a5 Institute of Physics and Czech Technical University, Academy of Sciences of the Czech Republic, Praha, Czech Republic
a6 Research Institute for Laser Physics, Scientific Center, “S.I.Vavilov State Optical Institute”, St. Petersburg, Russia

Article author query
kawata s   [Google Scholar] 
kong q   [Google Scholar] 
miyazaki s   [Google Scholar] 
miyauchi k   [Google Scholar] 
sonobe r   [Google Scholar] 
sakai k   [Google Scholar] 
nakajima k   [Google Scholar] 
masuda s   [Google Scholar] 
ho yk   [Google Scholar] 
miyanaga n   [Google Scholar] 
limpouch j   [Google Scholar] 
andreev aa   [Google Scholar] 
 

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 /m[omega]c = 10, the laser spot size of w0 = 15[lambda], and the laser pulse length of Lz = 10[lambda], the maximum energy gain reaches 301 MeV and the average energy 57.7 MeV. The electron bunch transverse radius is about 350[lambda] and the longitudinal size about 20[lambda]. The property of this accelerated bunch is improved compared with that generated by the laser of TEM (0, 0) mode.

(Received September 1 2004)
(Accepted October 25 2004)


Key Words: Electron bunch; Laser electron acceleration; Ponderomotive acceleration.

Correspondence:
c1 Address correspondence and reprint requests to: Shigeo Kawata, Department of Electrical and Electronic Engineering, Utsunomiya University, Yohtoh 7-1-2, Utsunomiya 321-8585, Japan. E-mail: kwt@cc.utsunomiya-u.ac.jp