Document Details

Document Type : Thesis 
Document Title :
theorical study of the lnteactions of terawatt lasers with plasma
دراسة نظرية لتفاعلات ليزرات اليتروات ليزر مع البلازما
 
Subject : Sciences Faculty for Girls 
Document Language : Arabic 
Abstract : A theoretical study was conducted of the interactions of Terawatt Lasers with matter to produce plasma, and with plasma to produce high electric fields that can be used in the process of accelerating electrons, protons and ions as well. Two important issues of the interaction of high-intensity laser with the plasma were selected: 1. The tunnelling ionization of helium using Terawatt Lasers to produce plasma. 2.The production of Wakefield behind the high-intensity laser pulse when penetrating the plasma. This study began with identifying some underlying physical principles of the process of generating intense laser pulses that are high and very short . The thesis investigated the behaviour of atoms in intense electric fields, the different mechanisms for substances ionization, and how the behaviour of the atom changes during the ionization with the high intensity of electric fields affecting the substance. In this study, we included how electrons in the plasma behave when exposed to high electric fields, and identified then the process of plasma formation from the interaction of Terawatt Lasers with the matter. We also mentioned the difference between the nature of the plasma formed by long and short pulse lasers and demonstrated the fundamental properties of the plasma in general. Then , the foundations of propagation of electromagnetic waves ( laser waves) in the plasma in terms of penetration of the plasma and the conditions of the reflection of such waves when the density is critical, the shape and reflection of waves propagation, how such waves coupled with the plasma and the required conditions for this coupling were reviewed. Moreover, we have dealt with the absorption mechanisms of the waves energy of the laser beam inside the plasma. The theory of different types of laser-plasma accelerators was also discussed. The simulation program (OOPIC) used in solving the issues under discussion was described in brief. The results of this study, which describes the physics of the propagation of laser in neutral helium, and the tunnelling ionization mechanisms that appears when the intensity of the laser is over the terawatt and how these types of lasers can fully ionize the gas used in the composition of the plasma. In the second issue, the high-intensity terawatt laser interacts with the already known-density pre-existing plasma and the results showed how the Wakefield was formed behind the terawatt laser pulse, and how the plasma electrons affected by these fields. 
Supervisor : dr.osama mohmmed aseied yassin 
Thesis Type : Master Thesis 
Publishing Year : 1432 AH
2011 AD 
Added Date : Saturday, March 26, 2011 

Researchers

Researcher Name (Arabic)Researcher Name (English)Researcher TypeDr GradeEmail
إبتسام محمد الزهرانيal.zahrani, ebtsam mohammedResearcherMaster 

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 29363.pdf pdf 

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