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Production of Electron and Flat Ion Blocks by Using Ultra Intense Laser, Particularly in the Ultraviolet Range

Zare, Somayye | 2015

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  1. Type of Document: Ph.D. Dissertation
  2. Language: Farsi
  3. Document No: 47147 (04)
  4. University: Sharif University of Technology
  5. Department: Physics
  6. Advisor(s): Anvari, Abbas; Sadighi Bonabi, Rasoul
  7. Abstract:
  8. In the present work, interaction of high power and ultra short laser pulse with plasma in both under relativistic and relativistic regimes is investigated. The accelerated ions and electron are studied. The effect of pulse laser shapes on generating of the optimum wakefield is studied to find the maximum generated wakefield amplitude. It is found that similar to the wakefield amplitude generated by single pulse, the wakefield amplitude produced by dual trailing depends on the pulse shape and their permutation. Furthermore, the interaction of sub-picosecond UV laser in sub-relativistic intensities with deuterium is investigated. At high plasma temperatures, based on the quantum correction in the collision frequency, the electron heating and the ion block generation in plasma is studied. It is found that due to the quantum correction, the electron heating increases considerably and the electron temperature uniformly reaches up to the maximum amount. As a consequence, by the modified collision frequency, the ion block is accelerated quicker with the higher maximum velocity in comparison with the one by the classical collision frequency. Moreover, the propagation of X-ray laser in both collisionless and collisional quantum plasma is investigated. It is recognized that the self-focusing length and the minimum of beam width decrease at the higher plasma densities. In addition, this is studied in collisional quantum plasma. It is shown that due to energy absorption in collisional plasma, the laser energy drops to amounts less than the critical value of the self-focusing effect, consequently, the laser beam defocuses. It is found that the oscillation amplitude of the laser spot size enhances while passing through collisional plasma. For the greater values of collision frequency, the beam width oscillates with higher amplitude and defocuses in a shallower plasma depth. It is realized that in a dense plasma environment, the laser self-focusing occurs earlier with the higher oscillation amplitude, smaller laser spot size and more oscillations
  9. Keywords:
  10. Wake Field ; Quantum Plasma ; Self-Focusing ; Ion Block ; Collision Frequency ; Laser Self-Focusing

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