Volume 81, Number 6, March 2008
|Number of page(s)||5|
|Section||Electromagnetism, Optics, Acoustics, Heat Transfer, Classical Mechanics, and Fluid Dynamics|
|Published online||20 February 2008|
Direct observation of betatron oscillations in a laser-plasma electron accelerator
Laboratoire d'Optique Appliquée, ENSTA, UMR 7639, CNRS, École Polytechnique - 91761 Palaiseau, France
2 GoLP/Centro de Física dos Plasmas, Instituto Superior Técnico - 1049-001 Lisboa, Portugal
Accepted: 18 January 2008
During experiments performed on a laser-plasma–based accelerator, correlation of the electron output angle with the electron energy has been observed. These spectral oscillations of the electron beam centroid are attributed to betatron oscillations of the electron beam during its propagation. An analytical model for betatron oscillations including constant longitudinal acceleration is described and used to validate the scenario and retrieve physical parameters. The oscillations can arise from an off-axis injection of the electrons, which can be reproduced using an asymmetric laser intensity profile in Particle-In-Cell (PIC) simulations. This study emphasizes the influence of non-ideal interaction conditions inherent to experiments.
PACS: 41.75.Jv – Laser-driven acceleration / 52.35.-g – Waves, oscillations, and instabilities in plasmas and intense beams / 52.38.Kd – Laser-plasma acceleration of electrons and ions
© EPLA, 2008
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.