Dust grain charge process in negative ion plasma
Other Title(s)
عملية شحن الحبيبة الغبارية في بلازما ذات الأيون السالب
Dissertant
Thesis advisor
Comitee Members
Jasim, Mahdi Hadi
Adim, Kazim Abd al-Wahid
Yahya, Khalid Abbas
University
University of Baghdad
Faculty
College of Science
Department
Department of Physics
University Country
Iraq
Degree
Master
Degree Date
2012
English Abstract
This work presents a computer studying to simulate charging process of dust grain immersed in plasma (electrons-K+ potassium ions) with negative ions ( sulfur hexafluoride ions) by basing on discrete model.
In this work, the discrete model is developed to take into account effect negative ions on charging process of dust grain.
The model was translated to a numerical calculation by using computer programs.
The program of model has been written in FORTRAN programming language to calculate the charging process for a dust particle in a plasma with negative ion, the time distribution of a dust charge, number charge equilibrium and charging time for parameter (ratio of number density of electron to number density of positive ion) =10-1, 10-2, 10-3, 10-4, 10-5, and different grains size.
The phase speed for negative ion dust-acoustic wave has been calculated at different value of (ratio of number density of negative ion to number density of positive ion).
The results of the work reveal that the charging of dust grains in negative ion plasma can be controlled by varying the relative fraction of negative ions in the plasma.
As the negative ion density is increased in plasma, more electrons become attached by negative ion and there is a corresponding reduction in the negative current of electrons and allow the more mobile positive ions to charge the dust.
Therefore, the negativity of charge number on dust grain decreases gradually to positive charge number.
III The results also revealed that the effect of negative ions concentration and negative ions temperature on phase speed negative ion dust-acoustic wave.
Main Subjects
Topics
No. of Pages
76
Table of Contents
Table of contents.
Abstract.
Abstract in Arabic.
Chapter One : Introduction.
Chapter Two : Theoretical background.
Chapter Three : Simulation and results.
References.
American Psychological Association (APA)
Mankhi, Zaynab Abd Allah. (2012). Dust grain charge process in negative ion plasma. (Master's theses Theses and Dissertations Master). University of Baghdad, Iraq
https://search.emarefa.net/detail/BIM-606659
Modern Language Association (MLA)
Mankhi, Zaynab Abd Allah. Dust grain charge process in negative ion plasma. (Master's theses Theses and Dissertations Master). University of Baghdad. (2012).
https://search.emarefa.net/detail/BIM-606659
American Medical Association (AMA)
Mankhi, Zaynab Abd Allah. (2012). Dust grain charge process in negative ion plasma. (Master's theses Theses and Dissertations Master). University of Baghdad, Iraq
https://search.emarefa.net/detail/BIM-606659
Language
English
Data Type
Arab Theses
Record ID
BIM-606659
