Compact Gamma-ray Sources via Laser-Plasma Interaction

UoM administered thesis: Phd

  • Authors:
  • Yuan Zhao

Abstract

Laser-plasma based electron sources have made impressive progress and shown great potential in accelerating electrons to GeV in centimeters. Such an outstanding feature makes them feasible to build the compact gamma-ray sources. Research about non-linear Compton scattering (NCS) paves the way to raise the photon energy to a level comparable to electron energy. Nevertheless, the collimation, brightness, beam size and conversion efficiency (CE) are still not good enough to serve as a practical radiation source. In this thesis, we explore gamma-ray production in plasma by particle-in-cell simulations. By virtue of the high electron density of solid, we investigate the photon emission in laser-solid interaction under different laser irradiation conditions. With delayed counter-propagating lasers, a dense electron zone is formed, which extends the colliding zone of NCS. The radiation pressure is utilized to accelerate a foil to high energy and obtain dense gamma-rays by colliding with a symmetric setup. Besides, the laser is superposed in the obliquely incident model, which rises the laser field and therefore boosts gamma-ray emission. To improve the laser absorption, micro-structure targets are employed. Thanks to the extended shining surface, NCS occurs efficiently with collimated ultra-dense gamma-ray radiated. The near critical density plasma is involved to further enhance CE and reduce the laser intensity to an available level. By using two continuous laser pulses, overdense electron bunches are trapped and radiating gamma-rays.

Details

Original languageEnglish
Awarding Institution
Supervisors/Advisors
Award date1 Aug 2021