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Particle-in-cell simulations of tunneling ionization effects in plasma-based accelerators

Phys. Plasmas 10, 2022 (2003); doi:10.1063/1.1566027

Issue Date: May 2003

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David L. Bruhwiler and D. A. Dimitrov
Tech-X Corporation, 5541 Central Ave., Suite 135, Boulder, Colorado 80301

John R. Cary
Tech-X Corporation, 5541 Central Ave., Suite 135, Boulder, Colorado 80301
Department of Physics, University of Colorado, Boulder, Colorado 80309-0390

Eric Esarey and Wim Leemans
Lawrence Berkeley National Laboratory, University of California, Berkeley, California 94720

Rodolfo E. Giacone
Department of Physics, University of Colorado, Boulder, Colorado 80309-0390
Plasma-based accelerators can sustain accelerating gradients on the order of 100 GV/m. If the plasma is not fully ionized, fields of this magnitude will ionize neutral atoms via electron tunneling, which can completely change the dynamics of the plasma wake. Particle-in-cell simulations of a high-field plasma wakefield accelerator, using the OOPIC code [D. L. Bruhwiler et al., Phys. Rev. ST  Accel. Beams 4, 101302 (2001)], which includes field-induced tunneling ionization of neutral Li gas, show that the presence of even moderate neutral gas density significantly degrades the quality of the wakefield. The tunneling ionization model in OOPIC has been validated via a detailed comparison with experimental data from the l'OASIS laboratory [W.P. Leemans et al., Phys. Rev. Lett. 89, 174802 (2002)]. The properties of a wake generated directly from a neutral gas are studied, showing that one can recover the peak fields of the fully ionized plasma simulations, if the density of the electron drive bunch is increased such that the bunch rapidly ionizes the gas. ©2003 American Institute of Physics.
History: Received 14 November 2002; accepted 12 February 2003
Permalink: http://link.aip.org/link/?PHPAEN/10/2022/1
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KEYWORDS and PACS

Keywords
PACS
  • 41.75.Ht
    Relativistic electron and positron beams
  • 41.75.Lx
    Other advanced accelerator concepts (charged-particle beams)
  • 52.25.Jm
    Ionization of plasmas
  • 52.65.Pp
    Monte Carlo methods (plasma simulation)
  • YEAR: 2003

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PUBLICATION DATA

ISSN:
1070-664X (print)   1089-7674 (online)
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