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Collisional effects on the modulational instability of intense laser pulses in magnetoactive plasmas

Published online by Cambridge University Press:  14 October 2015

A. R. Niknam ,
S. Barzegar ,
B. Bokaei ,
F. Haji Mirzaei  and
A. Aliakbari
A. R. Niknam*
Affiliation:
Laser and Plasma Research Institute, Shahid Beheshti University, G.C., Evin, Tehran, Iran
S. Barzegar
Affiliation:
Laser and Plasma Research Institute, Shahid Beheshti University, G.C., Evin, Tehran, Iran
B. Bokaei
Affiliation:
Laser and Plasma Research Institute, Shahid Beheshti University, G.C., Evin, Tehran, Iran
F. Haji Mirzaei
Affiliation:
Physics Department, Islamic Azad University, Arak Branch, Arak, Iran
A. Aliakbari
Affiliation:
Physics Department, Faculty of Science, Tafresh University, Tafresh, Iran
*
Address correspondence and reprint request to: Ali Reza Niknam, Laser and Plasma Research Institute, Shahid Beheshti University, G.C., Tehran, Iran. E-mail: a-niknam@sbu.ac.ir
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Abstract

The modulational instability associated with propagation of an intense laser pulse through a transversely magnetized plasma is investigated in the presence of collisional effects. The source-dependent expansion method for analyzing the wave equation is employed. The dispersion relation is obtained and modulational instability and its growth rate are studied. It is shown that in the absence of collisional effects the modulational instability is restricted to the small wavenumber region and the constant magnetic field reduces the growth rate of the instability. In contrast, in the collisional plasma, there is no upper limit of wavenumber for the existence of modulational instability. In addition, in this case, the growth rate of instability increases as the collision frequency goes up.

Keywords

Collision frequencyInstability growth rateMagnetized plasmaModulational instabilityPerturbation method
Type
Research Article
Information
Laser and Particle Beams , Volume 33 , Issue 4 , December 2015 , pp. 705 - 711
Copyright
Copyright © Cambridge University Press 2015 

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