Journal
LASER AND PARTICLE BEAMS
Volume 27, Issue 4, Pages 611-617Publisher
CAMBRIDGE UNIV PRESS
DOI: 10.1017/S0263034609990334
Keywords
Circularly polarized laser; PIC simulation; Quasi-monoenergetic proton beam
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Funding
- DFG [GRK1203, TR18]
- China Scholarship Council (CSC) [2008611025]
- Alexander von Humboldt Foundation
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We study proton acceleration from a foil target with a transversely varying density using multi-dimensional Particle-in-Cell (PIC) simulations. In order to reduce electron heating and deformation of the target, circularly polarized Gaussian laser pulses at intensities on the order of 1022 Wcm(-2) are used. It is shown that when the target density distribution fits that of the laser intensity profile, protons accelerated from the center part of the target have quasi-monoenergetic spectra and are well collimated. In our two-dimensional PIC simulations, the final peak energy can be up to 1.4 GeV with the full-width of half maximum divergence cone of less than 4 degrees. We observe highly efficient energy conversion from the laser to the protons in the simulations.
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