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Title: Numerical investigation of electron self-injection in the nonlinear bubble regime

The process of electron self-injection in the nonlinear bubble wake generated by a short and intense laser pulse propagating in a uniform underdense plasma is studied by means of fully self-consistent particle-in-cell simulations and test-particle simulations. We consider a wake generated by a non-evolving laser driver traveling with a prescribed velocity, which then sets the structure and the velocity of the wake, so the injection dynamics is decoupled from driver evolution, but a realistic structure for the wakefield is retained. We show that a threshold for self-injection into a non-evolving bubble wake exists, and we characterize the dependence of the self-injection threshold on laser intensity, wake velocity, and plasma temperature for a range of parameters of interest for current and future laser-plasma accelerators.
Authors:
; ; ;  [1] ;  [2]
  1. Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States)
  2. Department of Physics and Astronomy, University of Bologna and INFN, Via Irnerio 46, 40126 Bologna (Italy)
Publication Date:
OSTI Identifier:
22218553
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; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; BEAM-PLASMA SYSTEMS; ELECTRON TEMPERATURE; ELECTRONS; ION TEMPERATURE; LASERS; LIGHT TRANSMISSION; NONLINEAR PROBLEMS; NUMERICAL ANALYSIS; PLASMA DENSITY; PLASMA GUNS; PLASMA SIMULATION; TEST PARTICLES