Document Details

Document Type : Thesis 
Document Title :
Theoretical Investigation of the Interaction between Intense Laser and a Preformed Plasma Channel
دراسة نظرية لتفاعل الليزر عالي الشدة مع قناة بلازما موجودة مسبقاً
 
Subject : Theoretical Investigation of the Interaction between Intense Laser and a Preformed Plasma Channel 
Document Language : Arabic 
Abstract : In This Thesis, the interaction between high power laser and a preformed plasma channel has been studied . In this interaction electromagnetic and electrostatic waves are produced as a result of many parametric instabilities especially "Stimulated Raman Scattering (SRS)" instability. In this instability, electron plasma wave and a daughter electromagnetic wave are produced if the laser driver intensity is high enough to initiate this instability. The produced high amplitude electrostatic waves are found to be very useful in many applications especially in the field of table top laser -plasma accelerators which benefit in scientific and medical researches. The fluid model is used to describe these interactions because this model works well with waves and collective phenomena. Using this model produces set of nonlinear boundary conditioned differential equations with varying coefficients , which are very difficult to be solved analytically. A FORTRAN main program was developed to solve this problem using many subprograms to help in solving sub problems such as : the fourth order polynomial that represent the dispersion relations of the waves involved in the interactions. The program was tested on some special cases and passed the tests. The interaction of high power laser with ahomogenous plasma channel is investigated and the growth rate of both electron plasma wave and adaughter electromagnetic wave is found in different laser deriver intensity . Forward scattering is the only scattering found in this case . A plasma wave is coupled with daughter electromagnetic wave resonantly and amplified while propagating in the homogenous plasma channel. In case of backward scattering there is no amplification for both waves , but coupling between the two modes still exist . In an inhomogeneous plasma ,the program was tested to account for the saturation effects of the instability .The relativistic effects is excluded by limiting the laser driver intensity, and the damping effects also excluded by choosing relevant value for the density at resonance and amplifying area . At last a homogeneous plasma channel is introduced in an inhomogeneous linearly varying density plasma. Good results are obtained using the FORTRAN program which show that the amplification of the amplitudes of both modes will be affected by any presence of out of resonance plasma density near the entrance of plasma channel. 
Supervisor : Dr. Osama Mohamed el-sayed yassin 
Thesis Type : Doctorate Thesis 
Publishing Year : 1432 AH
2011 AD 
Number Of Pages : 187 
Added Date : Monday, April 18, 2011 

Researchers

Researcher Name (Arabic)Researcher Name (English)Researcher TypeDr GradeEmail
نايفة سليمان العطويAl-atawi, Nayfa SuleimanInvestigatorDoctoratejoood-28@hotmail.com

Files

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 29643.pdf pdf 

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