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Investigation of the Effective Parameters in the Attosecond X-Ray Spectrum Driven with Laser-Plasma Interaction in Relativistic Oscillating Surface

Shirozhan, Mojtaba | 2014

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 45316 (04)
  4. University: Sharif University of Technology
  5. Department: Physics
  6. Advisor(s): Sadighi Bonabi, Rasoul
  7. Abstract:
  8. With the invention of the Chirped Pulse Amplification (CPA) technique in 1985, it became possible to amplify ultra-short laser pulses to high intensities with suitable pre-pulses contrast. By considering the importance of the short wavelengths radiation sources, the interaction of the intense laser with dense plasma is one of the most promising routs to reach this goal.
    This thesis is devoted to theoretical studies of the interaction of intense laser pulses with solid-state targets. The Relativistically Oscillating Mirror (ROM) and the nanobunching regime models, which introduced in 2006 and 2010 respectively, are presented and discussed. The reflection of a laser pulse from an overdense plasma surface as the oscillating mirror, to the speed of light, could generate coherent X-ray pulses with accompanying temporal compression by a factor of 4γ2, where γ is the Lorentz factor of the mirror surface.
    In the second part of the thesis, the effects of the different parameters of the laser and plasma on the generated spectra in ROM model are studied. Then, based on the nanobunching regime, the roles of the polarized incident laser pulse on distribution of the plasma surface electrons and the reflected pulse in the relativistic laser-plasma interaction are investigated for the first time. Due to the effect of the nonlinear ponderomotive force on the generated electron nanobunches, considerable increasing in the localization and charge density of nanobunches are realized. It is found that the circularly polarized laser pulse have ne/ncr of 1500 on the plasma surface which is almost two and seven times more than the amounts for P-polarized and S-polarized, respectively
  9. Keywords:
  10. Doppler Effect ; X Rays ; High Power Laser ; Overdense Plasma ; High Harmonics Generation ; Electron Nanobunch ; Oscillating Mirror

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