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Effect of laser ripple on the beat wave excitation and particle acceleration

Published online by Cambridge University Press:  01 February 2007

P. K. CHAUHAN ,
S. T. MAHMOUD ,
R. P. SHARMA  and
H. D. PANDEY
P. K. CHAUHAN
Affiliation:
Center for Energy Studies, Indian Institute of Technology, New Delhi-110016, India ([email protected])
S. T. MAHMOUD
Affiliation:
Physics Department, UAE University, PO Box 17551, Al-Ain, United Arab Emirates
R. P. SHARMA
Affiliation:
Center for Energy Studies, Indian Institute of Technology, New Delhi-110016, India ([email protected])
H. D. PANDEY
Affiliation:
Center for Energy Studies, Indian Institute of Technology, New Delhi-110016, India ([email protected])
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Abstract.

This paper presents the effect of ripple on the plasma wave excitation process and acceleration of electrons in a laser produced plasma. The plasma wave is generated by the beating of two coaxial lasers of frequencies ω1 and ω2, such that ω1-ω2≅ωp. One of the main laser beams also has intensity spikes. The nonlinearity due to the relativistic mass variation depends not only on the intensity of one laser beam but also on the second laser beam. Therefore the behavior of the first laser beam affects the second laser beam, hence cross-focusing takes place. Owing to the interaction of ripple and the main laser beams, the ripple grows inside the plasma. The behavior of the ripple in the plasma affects the excitation of the electron plasma wave as well as the electron acceleration. The amplitude of the electron plasma wave and the electron energy are calculated, in the presence of ripple.

Type
Papers
Information
Journal of Plasma Physics , Volume 73 , Issue 1 , February 2007 , pp. 117 - 130
Copyright
Copyright © Cambridge University Press 2006

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