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Title: Efficient proton acceleration and focusing by an ultraintense laser interacting with a parabolic double concave target with an extended rear

A new scheme for acceleration and focusing of protons via an improved parabolic double concave target irradiated by an ultraintense laser pulse is proposed. When an intense laser pulse illuminates a concave target, the hot electrons are concentrated on the focal region of the rear cavity and they form a strong space-charge-separation field, which accelerates the protons. For a simple concave target, the proton energy spectrum becomes very broad outside the rear cavity because of transverse divergence of the electromagnetic fields. However, particle-in-cell simulations show that, when the concave target has an extended rear, the hot electrons along the wall surface induce a transverse focusing sheath field, resulting in a clear enhancement of proton focusing, which makes the lower proton energy spread, while, leads to a little reduction of the proton bunch peak energy.
Authors:
; ;  [1] ;  [2] ;  [3]
  1. Key Laboratory of Beam Technology and Materials Modification of the Ministry of Education, College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875 (China)
  2. Department of Physics, Anshan Normal University, Anshan 114005 (China)
  3. (China)
Publication Date:
OSTI Identifier:
22227997
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 20; Journal Issue: 7; 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; BEAM-PLASMA SYSTEMS; ELECTROMAGNETIC FIELDS; ELECTRONS; ENERGY SPECTRA; IRRADIATION; LASER TARGETS; LASER-PRODUCED PLASMA; PLASMA ACCELERATION; PLASMA PRODUCTION; PLASMA SHEATH; PLASMA SIMULATION; PROTONS; PULSES; SPACE CHARGE