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High-quality monoenergetic proton generation by sequential radiation pressure and bubble acceleration

Baifei Shen1,*, Xiaomei Zhang1, Zhengming Sheng2,3, M. Y. Yu3,4, and J. Cary5,6

  • 1State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
  • 2Department of Physics, Shanghai Jiao Tong University, Shanghai 200240, China
  • 3Institute for Fusion Theory and Simulation, Zhejiang University, Hangzhou 310027, China
  • 4Institut für Theoretische Physik I, Ruhr-Universität Bochum, D-44780 Bochum, Germany
  • 5Department of Physics, University of Colorado, Boulder, Colorado 80309, USA
  • 6Tech-X Corporation, Boulder, Colorado 80303, USA

  • *Author to whom correspondence should be addressed. bfshen@mail.shcnc.ac.cn
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Phys. Rev. ST Accel. Beams 12, 121301 – Published 10 December, 2009

DOI: https://doi.org/10.1103/PhysRevSTAB.12.121301

Abstract

Two-dimensional particle-in cell simulation shows that protons in a small target located in an underdense high-mass plasma can be accelerated by the radiation pressure of a short circularly polarized laser pulse as well as by the wake bubble field of the laser in the background plasma. The radiation-pressure preaccelerated protons are easily trapped and accelerated stably in front of the bubble for a relatively long distance. It is found that a quasimonoenergetic proton beam of 38 GeV peak energy and 12.6% energy spread as well as small divergence angle can be obtained with a 1023  W/cm2 18.26 kJ laser pulse in a tritium plasma of density 5.2×1020  cm−3.

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Phys. Rev. ST Accel. Beams 12, 121301– Published 10 December, 2009
  • Received 25 June 2009
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