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Title: High-flux low-divergence positron beam generation from ultra-intense laser irradiated a tapered hollow target

By using two-dimensional particle-in-cell simulations, we demonstrate high-flux dense positrons generation by irradiating an ultra-intense laser pulse onto a tapered hollow target. By using a laser with an intensity of 4 × 10{sup 23 }W/cm{sup 2}, it is shown that the Breit-Wheeler process dominates the positron production during the laser-target interaction and a positron beam with a total number >10{sup 15} is obtained, which is increased by five orders of magnitude than in the previous work at the same laser intensity. Due to the focusing effect of the transverse electric fields formed in the hollow cone wall, the divergence angle of the positron beam effectively decreases to ∼15° with an effective temperature of ∼674 MeV. When the laser intensity is doubled, both the positron flux (>10{sup 16}) and temperature (963 MeV) increase, while the divergence angle gets smaller (∼13°). The obtained high-flux low-divergence positron beam may have diverse applications in science, medicine, and engineering.
Authors:
 [1] ;  [2] ;  [1] ;  [2] ;  [2] ; ; ; ; ; ; ; ; ;  [1] ;  [3]
  1. College of Science, National University of Defense Technology, Changsha 410073 (China)
  2. (China)
  3. Center for Optical Research and Education, Graduate School of Engineering, Utsunomiya University, 7-1-2 Yohtoh, Utsunomiya 321-8585 (Japan)
Publication Date:
OSTI Identifier:
22486450
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 22; Journal Issue: 10; Other Information: (c) 2015 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; COMPUTERIZED SIMULATION; CONES; ELECTRIC FIELDS; FOCUSING; LASER TARGETS; LASERS; MEV RANGE; POSITRON BEAMS; PULSES; TWO-DIMENSIONAL CALCULATIONS