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Stopping of a relativistic electron beam in a plasma irradiated by an intense laser field

Published online by Cambridge University Press:  28 January 2014

H.B. Nersisyan  and
C. Deutsch
H.B. Nersisyan*
Affiliation:
Institute of Radiophysics and Electronics, Ashtarak, Armenia Centre of Strong Fields Physics, Yerevan State University, Yerevan, Armenia
C. Deutsch
Affiliation:
LPGP (UMR-CNRS 8578), Université Paris XI, Orsay, France
*
Address correspondence and reprint requests to: H.B. Nersisyan, Institute of Radiophysics and Electronics, 0203 Ashtarak, Armenia. E-mail: [email protected]
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Abstract

The effects of a radiation field (RF) on the interaction process of a relativistic electron beam (REB) with an electron plasma are investigated. The stopping power of the test electron averaged with a period of the RF has been calculated assuming an underdense plasma, ω0 > ωp, where ω0 is the frequency of the RF and ωp is the plasma frequency. In order to highlight the effect of the radiation field we present a comparison of our analytical and numerical results obtained for nonzero RF with those for vanishing RF. In particular, it has been shown that the weak RF increases the mean energy loss for small angles between the velocity of the REB and the direction of polarization of the RF while decreasing it at large angles. Furthermore, the relative deviation of the energy loss from the field-free value is strongly reduced with increasing the beam energy. Special case of the parallel orientation of the polarization of the RF with respect to the beam velocity has been also considered. At high-intensities of the RF two extreme regimes have been distinguished when the excited harmonics cancel effectively each other reducing strongly the energy loss or increasing it due to the constructive interference. Moreover, it has been demonstrated that the energy loss of the ultrarelativistic electron beam increases systematically with the intensity of the RF exceeding essentially the field-free value.

Keywords

Radiation fieldRelativistic electron beamStopping power
Type
Research Article
Information
Laser and Particle Beams , Volume 32 , Issue 1 , March 2014 , pp. 157 - 169
Copyright
Copyright © Cambridge University Press 2014 

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