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Title: Enhancement of proton energy by polarization switch in laser acceleration of multi-ion foils

We present a scheme to significantly increase the energy of quasi-monoenergetic protons accelerated by a laser beam without increasing the input power. This improvement is accomplished by first irradiating the foil several wave periods with circular polarization and then switching the laser to linear polarization. The polarization switch increases the electron temperature and thereby moves more electrons ahead of the proton layer, resulting in a space charge electric field pushing the protons forwards. The scaling of the proton energy evolution with respect to the switching time is studied, and an optimal switching time is obtained. The proton energy for the case with optimal switching time can reach about 80 MeV with an input laser power of 70 TW, an improvement of more than 30% compared to the case without polarization switch.
Authors:
; ;  [1] ;  [1] ;  [2] ;  [3] ;  [4] ;  [5]
  1. Department of Physics, University of Maryland, College Park, Maryland 20742 (United States)
  2. (United Kingdom)
  3. Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei 10617, Taiwan (China)
  4. (China)
  5. Department of Physics, National Central University, Taoyuan 32001, Taiwan (China)
Publication Date:
OSTI Identifier:
22218557
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 20; Journal Issue: 10; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ACCELERATION; COMPARATIVE EVALUATIONS; ELECTRIC FIELDS; ELECTRON TEMPERATURE; ELECTRONS; FOILS; ION TEMPERATURE; LASERS; LAYERS; LIGHT TRANSMISSION; MEV RANGE; PLASMA GUNS; POLARIZATION; PROTONS; SPACE CHARGE