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Wakefield Production in Quantum Plasma by Interaction Laser with Plasma

Mokhlesi, Esmaeil | 2017

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 49525 (04)
  4. University: Sharif University of Technology
  5. Department: Physics
  6. Advisor(s): Sadighi Bonabi, Rasoul
  7. Abstract:
  8. The aim of this thesis is to investigate one of the novel methods of accelerating particles such as electrons acceleration method. In intense femtosecond laser plasma interaction, a Wakefield is formed that trap electrons and accelerating them which this process will be fully addressed in this project. Due to the recent rapid development of technology for producing over dense plasma in laser-plasma interaction process in smaller sizes and the possibility of nuclear fusion reactions, the quantum effects are important and must be taken into account quantum effects in plasma. We study quantum effects by introducing the Bohmpotential and assuming the plasma as a one dimensional electron fermi gas. For obtaining the laser pulse shape dependence of Wakefield, the hydrodynamic equations in plasma are calculated. These equations are solved for single pulses and pair pulses, analytically. For single laser pulse interaction with plasma, it is shown that in the case of cosine-Gaussian shape laser pulse, the amplitude of Wakefield is more that other considered pulse shapes. Also, for pair pulses interaction with plasma, the super Gaussian- super Gaussian shape is able to produce high-amplitude Wakefield in comparison with the other designed laser pulse shapes. In the following, with considering a exponential ramp for plasma density, the square shape laser pulse produces a Wakefield with higher amplitude in comparison with the other investigated laser pulse shapes. In addition, the amplitude of Wakefield increases compared with plasma without considering the ramp. Furthermore, by comparison of these obtained results of quantum plasma with previous studies for classical plasma, we conclude that the quantum effects have significant importance in raising the amplitude of produced Wakefield with over dense plasma, while that these effects are less important for low-density plasma
  9. Keywords:
  10. Wake Field ; Femtosecond Laser ; Quantum Plasma ; Accelerators ; Ramp Plasma

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