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

Journal Article · Sun May 15 00:00:00 EDT 2011 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.3591361· OSTI ID:21537828

Bhasin, Lalita; Tripathi, V K ^[1]; Tripathi, Deepak; Uma, R ^[2]

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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)

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}.

• OSTI ID: 21537828
• Journal Information: Physics of Plasmas, Vol. 18, Issue 5; Other Information: DOI: 10.1063/1.3591361; (c) 2011 American Institute of Physics; ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

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