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Title: Laser beat wave terahertz generation in a clustered plasma in an azimuthal magnetic field

Abstract

Laser beat wave excitation of terahertz radiation in a rippled density clustered plasma, in the presence of an azimuthal magnetic field, is investigated. The lasers exert a beat ponderomotive force on cluster electrons, imparting them an oscillatory velocity with a significant transverse component due to the azimuthal magnetic field. The oscillatory velocity beats with the cluster density ripple and produces a nonlinear current, driving terahertz radiation. The terahertz field turns out to have ring shaped distribution. Its amplitude is enhanced by the cluster plasma resonance when (4{pi}/3)n{sub c0}r{sub c0}{sup 3}n{sub e}/({omega}{sup 2}-{omega}{sub pe}{sup 2}/3)>n{sub 0}/{omega}{sup 2}.

Authors:
;  [1]; ;  [2]
  1. Department of Physics, Indian Institute of Technology Delhi, New Delhi 110016 (India)
  2. Center for Energy Studies, Indian Institute of Technology Delhi, New Delhi 110016 (India)
Publication Date:
OSTI Identifier:
21537828
Resource Type:
Journal Article
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 18; Journal Issue: 5; Other Information: DOI: 10.1063/1.3591361; (c) 2011 American Institute of Physics; Journal ID: ISSN 1070-664X
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; EXCITATION; LASERS; MAGNETIC FIELDS; NONLINEAR PROBLEMS; PLASMA; PLASMA CONFINEMENT; PLASMA DENSITY; PLASMA WAVES; PONDEROMOTIVE FORCE; CONFINEMENT; ENERGY-LEVEL TRANSITIONS

Citation Formats

Bhasin, Lalita, Tripathi, V. K., Tripathi, Deepak, and Uma, R. Laser beat wave terahertz generation in a clustered plasma in an azimuthal magnetic field. United States: N. p., 2011. Web. doi:10.1063/1.3591361.
Bhasin, Lalita, Tripathi, V. K., Tripathi, Deepak, & Uma, R. Laser beat wave terahertz generation in a clustered plasma in an azimuthal magnetic field. United States. doi:10.1063/1.3591361.
Bhasin, Lalita, Tripathi, V. K., Tripathi, Deepak, and Uma, R. Sun . "Laser beat wave terahertz generation in a clustered plasma in an azimuthal magnetic field". United States. doi:10.1063/1.3591361.
@article{osti_21537828,
title = {Laser beat wave terahertz generation in a clustered plasma in an azimuthal magnetic field},
author = {Bhasin, Lalita and Tripathi, V. K. and Tripathi, Deepak and Uma, R.},
abstractNote = {Laser beat wave excitation of terahertz radiation in a rippled density clustered plasma, in the presence of an azimuthal magnetic field, is investigated. The lasers exert a beat ponderomotive force on cluster electrons, imparting them an oscillatory velocity with a significant transverse component due to the azimuthal magnetic field. The oscillatory velocity beats with the cluster density ripple and produces a nonlinear current, driving terahertz radiation. The terahertz field turns out to have ring shaped distribution. Its amplitude is enhanced by the cluster plasma resonance when (4{pi}/3)n{sub c0}r{sub c0}{sup 3}n{sub e}/({omega}{sup 2}-{omega}{sub pe}{sup 2}/3)>n{sub 0}/{omega}{sup 2}.},
doi = {10.1063/1.3591361},
journal = {Physics of Plasmas},
issn = {1070-664X},
number = 5,
volume = 18,
place = {United States},
year = {2011},
month = {5}
}