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Title: Dynamics of ionization-induced electron injection in the high density regime of laser wakefield acceleration

The dynamics of ionization-induced electron injection in high density (∼1.2 × 10{sup 19} cm{sup −3}) regime of laser wakefield acceleration is investigated by analyzing the betatron X-ray emission. In such high density operation, the laser normalized vector potential exceeds the injection-thresholds of both ionization-injection and self-injection due to self-focusing. In this regime, direct experimental evidence of early on-set of ionization-induced injection into the plasma wave is given by mapping the X-ray emission zone inside the plasma. Particle-In-Cell simulations show that this early on-set of ionization-induced injection, due to its lower trapping threshold, suppresses the trapping of self-injected electrons. A comparative study of the electron and X-ray properties is performed for both self-injection and ionization-induced injection. An increase of X-ray fluence by at least a factor of two is observed in the case of ionization-induced injection due to increased trapped charge compared to self-injection mechanism.
Authors:
; ; ; ; ;  [1] ; ; ; ; ;  [2] ; ;  [3] ;  [4]
  1. Laboratoire de Physique des Gaz et des Plasmas, CNRS-Université Paris-Sud, 91405 Orsay (France)
  2. Department of Physics, Lund University, P. O. Box 118, S-22100 Lund (Sweden)
  3. Laboratoire Interactions, Dynamique et Lasers, CEA Saclay, 91191 Gif-sur-Yvette (France)
  4. Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States)
Publication Date:
OSTI Identifier:
22403313
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 21; Journal Issue: 12; Other Information: (c) 2014 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; ACCELERATION; BETATRONS; DENSITY; ELECTRON BEAM INJECTION; ELECTRONS; INJECTION; LASERS; PLASMA WAVES; TRAPPING; X RADIATION