Dust grain charge process in negative ion plasma

العناوين الأخرى

عملية شحن الحبيبة الغبارية في بلازما ذات الأيون السالب

مقدم أطروحة جامعية

Mankhi, Zaynab Abd Allah

مشرف أطروحة جامعية

Khalaf, Thamir Hamid

أعضاء اللجنة

Jasim, Mahdi Hadi
Adim, Kazim Abd al-Wahid
Yahya, Khalid Abbas

الجامعة

جامعة بغداد

الكلية

كلية العلوم

القسم الأكاديمي

قسم الفيزياء

دولة الجامعة

العراق

الدرجة العلمية

ماجستير

تاريخ الدرجة العلمية

2012

الملخص الإنجليزي

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.

التخصصات الرئيسية

الفيزياء

الموضوعات

• الغبار

عدد الصفحات

76

قائمة المحتويات

• APA
• MLA
• AMA

لغة النص

الإنجليزية

نوع البيانات

رسائل جامعية

رقم السجل

BIM-606659