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Carbon and Proton Beams Acceleration by Ultrashort Intense Ti-sapphire Laser Pulse

Abed, Ali | 2020

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 57763 (04)
  4. University: Sharif University of Technology
  5. Department: Physics
  6. Advisor(s): Sadighi Bonabi, Rasoul
  7. Abstract:
  8. Nowadays, improved laser technologies and ultra-short pulse generation yield Ion and proton accelerations through laser-plasma interaction that has attracted great interest among researchers. Laser-induced particle beam acceleration establishes unique features compared to previous traditional methods that make them an attractive research field. Interacting high-power lasers with a dense matter or plasmas would generate an electrostatic field up to a few TV/m that is suitable to provide accelerated ion beams even up to few tens of GeV within a small micrometer volume. While the accelerated ion beams possess outstanding features, challenges such as increasing ion energies, spatial-spectral control over ion beams, and energy exchange coefficient of laser field to the plasma particles still need to be solved. In this thesis, we employ laser field pulse shaping and control target design to improve the ion beam energies using particle in cell simulation. Specifically, two mechanisms such as target normal sheet acceleration (TNSA) and radiation pressure acceleration (RPA) are investigated. The laser-plasma interaction for different material densities and corresponds ion energies are studied using the TNSA mechanism. The beam energy has been improved in the presented system using the multilayer target with various densities. Next, the number of accelerated ions is increased by introducing a chirp parameter to the laser field. The important aspect of this pulse shaping is the symmetry suppression in the spectral domain and due to the wide frequency spectrum, this method is known as an efficient mechanism for pulse shaping operation. The second method is the radiation pressure technique, known as RPA that is an efficient way to produce accelerated particle beams. In this thesis, this method is employed to a two-layer target with underdense plasma to produce accelerated beams. The effect of various laser field polarizations on the laser field interaction with a two-layer target is also investigated. It is shown that the shaped laser pulse commensurate with the target properties, yields a considerable increase in the number of accelerated particles
  9. Keywords:
  10. Radiation Pressure Acceleration ; Electron Density ; Chirped Pulse ; Target Normal Sheath Acceleration ; plasma Critical Density ; Titanium Sapphire Laser

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