skip to main content

SciTech ConnectSciTech Connect

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

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.
Authors:
; ;  [1] ;  [1] ;  [2] ;  [1] ;  [3] ;  [4]
  1. Centre for Energy Studies, Indian Institute of Technology Delhi, Delhi 110016 (India)
  2. (Deemed University), DayalBagh, Agra 282005 (India)
  3. (India)
  4. Department of Physics and Computer Science, Dayal Bagh Educational Institute(Deemed University), DayalBagh, Agra 282005 (India)
Publication Date:
OSTI Identifier:
22410310
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 22; Journal Issue: 5; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
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