Numéro |
J. Phys. IV France
Volume 133, June 2006
|
|
---|---|---|
Page(s) | 1123 - 1126 | |
DOI | https://doi.org/10.1051/jp4:2006133228 | |
Publié en ligne | 16 juin 2006 |
J.-C. Gauthier, et al.
J. Phys. IV France 133 (2006) 1123-1126
DOI: 10.1051/jp4:2006133228
Generation and characterization of quasi-monoenergetic electron beams from laser wakefield
A. Maksimchuk, S. Reed, N. Naumova, V. Chvykov, B. Hou, G. Kalintchenko, T. Matsuoka, J. Nees, P. Rousseau, G. Mourou and V. YanovskyFOCUS Center and Center for Ultrafast Optical Science, University of Michigan, 2200 Bonisteel blvd., Ann Arbor, Michigan 48109, USA
Abstract
In the interaction of a 30 fs, 40 TW Ti:sapphire Hercules
laser focused to the intensity of 1019 W/cm2 onto a supersonic He
gas jet, we observed quasi-monoenergetic electron beams with energy up to
300 MeV and an angular divergence of 10 mrad. We found that the initial
plasma density significantly affects the resultant electron beam. For plasma
densities ranging between 2 1019 to 3.5
1019 cm - 3,
quasi-monoenergetic electrons with energies from 80 to 160 MeV and a total
charge of about 0.5 nC were produced. Lower plasma densities around
1.5
1019 cm - 3 produced quasi-monoenergetic electron beams with
higher energy, up to 320
50 MeV, but with a decrease of the total
charge to about 5 pC. Characterization of the electron beam in terms of the
electron's maximum energy, beam divergence and pointing stability is
presented. The performed 2D PIC simulations show the evolution of the laser
pulse in the plasma, electron injection, and the specifics of electron
acceleration.
© EDP Sciences 2006