Dynamics of the excitation of an upper hybrid wave by a rippled laser beam in magnetoplasma

Purohit, Gunjan; Chauhan, P. K.; Sharma, R. P.
May 2008
Physics of Plasmas;May2008, Vol. 15 Issue 5, p052101
Academic Journal
This paper presents the effects of a laser spike (superimposed on an intense laser beam) and a static magnetic field on the excitation of the upper hybrid wave (UHW) in a hot collisionless magnetoplasma, taking into account the relativistic nonlinearity. The laser beam is propagating perpendicular to the static magnetic field and has its electric vector polarized along the direction of the static magnetic field (ordinary mode). Analytical expressions for the growth rate of the ripple, the beam width of the rippled laser beam, and the UHW have been obtained. It is found that the coupling among the main laser beam, ripple, and UHW is strong. The ripple gets focused when the initial power of the laser beam is greater than the critical power for focusing. It has been shown that the presence of a laser spike affects significantly the growth rate and the dynamics of the UHW. In addition, it has been seen that the effect of changing the strength of the static magnetic field on the nonlinear coupling and on the dynamics of the excitation of the UHW is significant. The results are presented for typical laser plasma parameters.


Related Articles

  • Theory of cosmological seed magnetic fields. Saleem, H. // Physics of Plasmas;Jul2007, Vol. 14 Issue 7, p072105 

    A theory for the generation of seed magnetic field and plasma flow on cosmological scales driven by externally given baroclinic vectors is presented. The Beltrami-like plasma fields can grow from zero values at initial time t=0 from a nonequilibrium state. Exact analytical solutions of the set...

  • Anomalous absorption due to ion-acoustic decay instability in a large-scale plasma relevant to... Mizuno, K.; Young, P.E.; Estabrook, K. // Physics of Plasmas;Apr95, Vol. 2 Issue 4, p1023 

    Shows that the anomalous length of the laser light due to the ion-acoustic decay instability (IADI) can be much smaller than the instability width with a relatively weak laser intensity in a large-scale plasma. Sufficiency of an instability width of only a few laser wavelengths to absorb most...

  • Comment on 'Landau-fluid simulation of laser filamentation' [Phys. Plasmas 1, 1287 (1994)]. Maximov, A.V.; Silin, V.P. // Physics of Plasmas;Apr95, Vol. 2 Issue 4, p1355 

    Comments on the article 'Landau-fluid simulation of laser filamentation,' in the 1994 issue of the periodical 'Physics of Plasmas.' Approach to the theory of filamentation of laser radiation in plasmas as outlined in the paper of Kaider et al; Electron nonlocal heat conductivity used for...

  • Temporally and spatially resolved measurements of multi-megagauss magnetic fields in high intensity laser-produced plasmas. Gopal, A.; Tatarakis, M.; Beg, F. N.; Clark, E. L.; Dangor, A. E.; Evans, R. G.; Norreys, P. A.; Wei, M. S.; Zepf, M.; Krushelnick, K. // Physics of Plasmas;Dec2008, Vol. 15 Issue 12, p122701 

    We report spatially and temporally resolved measurements of self-generated multi-megagauss magnetic fields produced during ultrahigh intensity laser plasma interactions. Spatially resolved measurements of the magnetic fields show an asymmetry in the distribution of field with respect to the...

  • Laser generated plasmas characterized under magnetic field. Ducruet, C.; Kornilov, N.; de Juli├ín Fern├índez, C.; Givord, D. // Applied Physics Letters;1/23/2006, Vol. 88 Issue 4, p044102 

    The confinement of laser generated plasmas by a magnetic field is exploited to analyze the properties of plasmas of different materials. The ablation threshold is approximately proportional to Cv(Tmelt-300) (Tmelt=melting temperature, Cv=specific heat). The ablation rate is related to the...

  • Compton harmonic resonances, stochastic instabilities, quasilinear diffusion, and collisionless damping with ultra-high-intensity laser waves. Rax, J. M. // Physics of Fluids B: Plasma Physics;Dec92, Vol. 4 Issue 12, p3962 

    The dynamics of an electron in a finite set of linearly or circularly polarized ultra-high-intensity (above 1018 W/cm2) laser waves is investigated within the framework of a Hamiltonian analysis. The Compton harmonic resonances are identified as the source of various stochastic instabilities....

  • Nonlinear wake-field generation and relativistic focusing of intense laser pulses in plasmas. Ting, A.; Esarey, E.; Sprangle, P. // Physics of Fluids B: Plasma Physics;Jun90, Vol. 2 Issue 6, p1390 

    The generation of nonlinear plasma wake fields by an intense, short laser pulse and the relativistic optical guiding of intense laser pulses in plasmas are studied with a nonlinear, selfconsistent model of laser-plasma interactions. Nonlinear steepening and period lengthening of the plasma waves...

  • Temperature field computation for a rotating cylindrical workpiece under laser quenching. Hongwei Xu; Chen, W. Wayne; Kun Zhou; Yumei Huang; Wang, Q. Jane // International Journal of Advanced Manufacturing Technology;Jun2010, Vol. 47 Issue 5-8, p679 

    Laser quenching is usually performed on a localized area of workpiece surfaces through a certain thermal cycle. As a result, the treated area possesses improved mechanical properties. The quality of the treatment results depends on the selection of laser process parameters, which relies on the...

  • Stability of a plasma foil in the radiation pressure dominated regime. Pegoraro, F.; Bulanov, S. V. // European Physical Journal D -- Atoms, Molecules, Clusters & Opti;Mar2010, Vol. 55 Issue 2, p399 

    The stability of a thin plasma foil accelerated to relativistic velocities by the radiation pressure of an ultra high intensity electromagnetic pulse is investigated. The effects of the onset of a Rayleigh-Taylor-like instability are discussed in the context of the ion acceleration process...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics