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Title: Bubble shape and electromagnetic field in the nonlinear regime for laser wakefield acceleration

The electromagnetic field in the electron “bubble” regime for ultra-intense laser wakefield acceleration was solved using the d'Alembert equations. Ignoring the residual electrons, we assume an ellipsoidal bubble forms under ideal conditions, with bubble velocity equal to the speed of light in vacuum. The general solution for bubble shape and electromagnetic field were obtained. The results were confirmed in 2.5D PIC (particle-in-cell) simulations. Moreover, slopes for the longitudinal electric field of larger than 0.5 were found in these simulations. With spherical bubbles, this slope is always smaller than or equal to 0.5. This behavior validates the ellipsoid assumption.
Authors:
; ; ;  [1] ;  [1] ;  [2] ;  [3]
  1. Applied Ion Beam Physics Laboratory, Key Laboratory of the Ministry of Education, Institute of Modern Physics, Fudan University, Shanghai 200433 (China)
  2. (Czech Republic)
  3. Department of Advanced Interdisciplinary Sciences, Utsunomiya University, 7-1-2 Yohtoh, Utsunomiya 321-8585 (Japan)
Publication Date:
OSTI Identifier:
22490082
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 22; Journal Issue: 8; 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; BUBBLES; COMPUTERIZED SIMULATION; ELECTRIC FIELDS; ELECTROMAGNETIC FIELDS; ELECTRONS; EQUATIONS; LASER RADIATION; MATHEMATICAL SOLUTIONS; NONLINEAR PROBLEMS; SPHERICAL CONFIGURATION; VISIBLE RADIATION; WAKEFIELD ACCELERATORS