Etudy of the linear and nonlinear regimes in an unmagnetized electron-ion plasma.
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Date
2020
Authors
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Journal ISSN
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Publisher
Universidad de Concepción.
Abstract
In order to study how the dynamics of an unmagnetized Maxwellian electron plasma
is modified by the presence of mobile positive heavy ions, the present work aims to
study the regimes of damped and nonlinear perturbations in a driftless Maxwellian
electron-ion plasma, considiring a mass ratio mi/me = 1836.153 and charge ratio
qi/|qe| = 1.0, specifically in the range of low frequencies (ωr ≤ 0.2ωpe) and velocities
in the order of the ion acoustic phase velocity vφ,IA for the excited wavenumber,
primarily for the temperature ratio Ti/Te = 1.0. Also, the response of the plasma
is studied for different temperature ratios Ti/Te above and below Ti/Te = 1.0. The
whole study is accomplished through numerical simulations of the Vlasov-Poisson
system of equations using spectral interpolation in position and velocity, and symplectic integration in the time dependency. It is expected that in the case of damped
perturbations both Langmuir and ion acoustic waves propagate relatively independent from each other and exhibit opposite behaviors in the velocity range of interest,
whereas in the nonlinear case, electrostatic solitary waves are expected to arise due
to the presence of heavy mobile ions related to electron trapping and ion acoustic
solitons. It is expected that dynamics related to the ions is accentuated with lower
ratios Ti/Te.
Description
Tesis para optar al grado de Magíster en Ciencias, mención Física.
Keywords
Sistemas no Lineales, Ondas de Plasma, Plasma, Sistemas no Lineales, Ondas de Plasma, Frecuencias, Plasma, Frecuencias de Sistemas Oscilantes, Frecuencias, Frecuencias de Sistemas Oscilantes, Industria Innovación e Infraestructura, Industria Innovación e Infraestructura