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Investigation of Energetic Electrons Behavior in Ultrafast High Power Laser-Matter Interaction

Moshkel-Gosha, Masoume | 2013

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  1. Type of Document: Ph.D. Dissertation
  2. Language: Farsi
  3. Document No: 45315 (05)
  4. University: Sharif University of Technology
  5. Department: Physics
  6. Advisor(s): Sadighi-Bonabi, Rasoul
  7. Abstract:
  8. Resent advances in ultra-intense short-pulse lasers and their numerous applications stimulated the research activities in important fields such as generation of high-energy electron and ion beams, monoenergetic electron beam, monoenergetic ion beam, X-ray emission, terahertz radiation, high harmonic and attosecond pulses generation. In all above mentioned applications the relativistic electrons behavior especially the electron density distribution and the velocity of electrons play an important role.
    Investigating the behavior of relativistic electrons which are generated in the interaction of high power femtosecond lasers with plasma and their related applications is the main purpose of this thesis. Therefore, the relativistic in the propagation of electrons in short intense pulses with Gaussian intensity profile in underdense plasma the modified electron density due to ponderomotive force and relativistic effects is discussed. The desired initial electron density is introduced for achieving the optimum electron density distribution and self-focusing and the effect of laser and plasma parameters on self-focusing is obtained. Beam width parameter close to laser wavelength is achieved by introducing the spacial initial ramp electron density. This is an important effect in laser-plasma accelerators. The intense laser pulses reflection from relativistic electrons of plasma-vacuum surface and the related phenomena is also investigated based on the Relativistic Oscillating Mirror (ROM) and Totally Relativistic Oscillating Mirror (TROM) models. The localized electron nanobunches in TROM model is reached and based on this condition generation of intense coherent x-ray radiation and attosecond pulses is obtained in the particle in cell simulation.The effect of pulse polarization on nano bunches is also discussed based on this model.
  9. Keywords:
  10. Plasma ; Electron ; High Power Laser ; Beam Width ; Self-Focusing ; High Power Short Laser ; Relativistic Electrons

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