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

Desforges, F. G.; Paradkar, B. S.; Hansson, Magnus LU ; Ju, J.; Senje, Lovisa LU ; Audet, T. L.; Persson, A.; Dobosz-Dufrenoy, S.; Lundh, Olle LU and Maynard, G., et al. (2014) In Physics of Plasmas 21(12).
Abstract
The dynamics of ionization-induced electron injection in high density (similar to 1.2 x 10(19) cm(-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... (More)
The dynamics of ionization-induced electron injection in high density (similar to 1.2 x 10(19) cm(-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. (C) 2014 AIP Publishing LLC. (Less)
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Physics of Plasmas
volume
21
issue
12
publisher
American Institute of Physics
external identifiers
  • wos:000347162700003
  • scopus:84916208983
ISSN
1070-664X
DOI
10.1063/1.4903845
language
English
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yes
id
2e70edd3-97b2-48a1-963b-9c5ddc9c2ecf (old id 5084843)
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2015-02-25 17:25:41
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2017-04-02 03:09:20
@article{2e70edd3-97b2-48a1-963b-9c5ddc9c2ecf,
  abstract     = {The dynamics of ionization-induced electron injection in high density (similar to 1.2 x 10(19) cm(-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. (C) 2014 AIP Publishing LLC.},
  articleno    = {120703},
  author       = {Desforges, F. G. and Paradkar, B. S. and Hansson, Magnus and Ju, J. and Senje, Lovisa and Audet, T. L. and Persson, A. and Dobosz-Dufrenoy, S. and Lundh, Olle and Maynard, G. and Monot, P. and Vay, J. -L. and Wahlström, Claes-Göran and Cros, B.},
  issn         = {1070-664X},
  language     = {eng},
  number       = {12},
  publisher    = {American Institute of Physics},
  series       = {Physics of Plasmas},
  title        = {Dynamics of ionization-induced electron injection in the high density regime of laser wakefield acceleration},
  url          = {http://dx.doi.org/10.1063/1.4903845},
  volume       = {21},
  year         = {2014},
}