Spatio-temporal evolution of magnetosonic wave in the laser plasma interaction

Journal Article · Fri May 15 04:00:00 EDT 2015 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4921132· OSTI ID:22410310

Sharma, Swati ^[1]; Satsangi, V. R. ^[2]

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1. Centre for Energy Studies, Indian Institute of Technology Delhi, Delhi 110016 (India)
2. Department of Physics and Computer Science, Dayal Bagh Educational Institute(Deemed University), DayalBagh, Agra 282005 (India)

This paper presents a theoretical model for the transient response of nonlinear coupling between magnetosonic wave and ion acoustic wave in the overdense plasma. Filamentation of magnetosonic wave has been considered to be responsible for magnetic turbulence during the laser plasma interaction. The ion acoustic wave gets excited due to the ponderomotive force exerted by magnetosonic wave and this ion acoustic wave in turn generates perturbation in the background density in the form of spatial density harmonics. Numerical simulation has been carried out for dimensionless coupled equations of magnetosonic wave and ion acoustic wave; and the results show quite complex localized structures that grow with time. The power spectrum has also been studied which shows that the spectral index follows an approximate scaling of the order of ∼k{sup −2.4} at smaller scales. The data obtained from numerical simulation are used in semi analytical model to better understand the mechanism of nonlinear evolution of magnetosonic wave. The results indicate considerable randomness in the spatial structure of the magnetic field profile which gives sufficient indication of turbulence.

• OSTI ID: 22410310
• Journal Information: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 5 Vol. 22; ISSN PHPAEN; ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
COMPUTERIZED SIMULATION
DISTURBANCES
HARMONICS
INTERACTIONS
ION ACOUSTIC WAVES
LASERS
MAGNETIC FIELDS
MAGNETOACOUSTIC WAVES
NONLINEAR PROBLEMS
PLASMA
PONDEROMOTIVE FORCE
SPECTRA
TURBULENCE