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首页> 外文期刊>Physics of plasmas >Modulational instability and ion-acoustic envelopes in dense plasmas with trapped/untrapped electrons
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Modulational instability and ion-acoustic envelopes in dense plasmas with trapped/untrapped electrons

机译：具有被捕获/未凝视的电子的致密等离子体中的调制不稳定性和离子声信封

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摘要

The linear and nonlinear properties of ion-acoustic rogons and associated modulational instability (MI) are studied in an unmagnetized dense electron-ion plasma, containing degenerate trapped/untrapped electrons and classical adiabatic ions. Solving the quantum hydrodynamic equations by using the standard multiscale reductive perturbation technique, a nonlinear Schrodinger equation is derived, which admits potential envelopes to be stable (unstable) against the perturbations for PQ < 0 (PQ > 0). Here, P and Q are the dispersion and non linearity coefficients, respectively. It is numerically shown that for the vanishing ionic temperature ratio (sigma = 0), the parametric regime at perturbation wavelengths lambda > 2.5 lambda(eff) (lambda <= 2.5 lambda(eff)) is always modulationally stable (unstable); here,), lambda(eff) is the effective screening length. Moreover, the finite ionic temperature (T-i < 10 eV) restores the modulational stability at relatively short wavelengths by confining MI within the perturbation range 4.5 lambda(eff) < lambda < 1.3 lambda(eff). The parameter Theta(= T-e/2 root 2 mu) shows the impact of the untrapped electrons which not only enhances (reduces) the angular frequency (group speed) of the envelope but also piles up the wave crests (energy) to produce the MI. Furthermore, due to degenerate trapped electrons, the instability domain gets widened in the limit PQ > 0 and leads to the onset of MI and unstable excitations. The study has important results for understanding the mechanism of MI and unstable modes in the context of astrophysical environments (white dwarfs, neutron stars, etc.,) and high density experiments. Published under license by AIP Publishing.
机译：在未磁化的致密电子离子等离子体中研究了离子声岩石和相关调节不稳定性（MI）的线性和非线性性质，其含有简并捕获/未凝视的电子和经典的绝热离子。通过使用标准的多尺度还原扰动技术来求解量子流体动力学方程，导出非线性Schrodinger方程，这承认潜在的信封对PQ <0（PQ> 0）的扰动稳定（不稳定）。这里，P和Q分别是色散和非线性系数。在数值上表明，对于消失的离子温度比（Sigma = 0），扰动波长λ> 2.5λ（Eff）（Lambda <= 2.5λ（Eff））的参数化制度总是调节稳定（不稳定）;这里，），Lambda（Eff）是有效的筛选长度。此外，有限的离子温度（T-I <10EV）通过在扰动范围内的扰动范围内的MI 4.5λ（EFF） 0中加宽，并导致MI和不稳定激励的开始。该研究具有在天体物理环境（白矮星，中子恒星等，）和高密度实验的背景下了解MI和不稳定模式的机制。通过AIP发布在许可证下发布。

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  • 来源
    《Physics of plasmas》 |2019年第3期|共7页
  • 作者

    Irfan M.; Ali S.; Mirza Arshad M.;

  • 作者单位

    Univ Malakand Chakdara Dir L Dept Phys Khyber Pakhtun Khwa 18800 Pakistan;

    Natl Ctr Phys QAU Campus Shandra Valley Rd Islamabad 44000 Pakistan;

    Quaid I Azam Univ Dept Phys Theoret Plasma Phys Grp Islamabad 45320 Pakistan;

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  • 正文语种 eng
  • 中图分类 等离子体物理学;
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