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Photon acceleration in the amplified plasma density wake of two copropagating laser pulses

Source: Phys. Plasmas 17, 073102 (2010); doi:10.1063/1.3457125

Published 14 July 2010

KEYWORDS and PACS
Keywords
PACS
  • 41.75.Jv
    Laser-driven acceleration of charged-particle beams
  • 52.38.Kd
    Laser-plasma acceleration of electrons and ions
  • 52.59.-f
    Intense particle beams and radiation sources in plasmas
  • 52.70.-m
    Plasma diagnostic techniques and instrumentation
  • YEAR: 2010
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PUBLICATION DATA
ISSN:
1553-9601 (online)
Publisher:
AIP is a member of CrossRef AIP
G. Raj, M. R. Islam, B. Ersfeld, and D. A. Jaroszynski
Department of Physics, Scottish Universities Physics Alliance, University of Strathclyde, Glasgow G4 0NG, United Kingdom and University of Strathclyde, Glasgow G4 0NG, United Kingdom
Photon acceleration of a laser pulse occurs in a medium with a space and time-varying permittivity. Using Hamiltonian formulation, a theoretical study of the frequency upshift of a probe laser pulse, which is considered as a “quasiphoton” or “test particle,” propagating through an amplified plasma density wake of two copropagating laser pulses, is presented. The linear superposition of wakefields studied using an analytical model shows that the presence of a controlling pulse amplifies the wake of a driver pulse. The amplified wake amplitude can be controlled by varying the delay between the two pulses. Two-dimensional particle-in-cell simulations demonstrate wake superposition due to the two copropagating laser pulses. A phase space analysis shows that the probe photon can experience a significant frequency upshift in the amplified density wake. Furthermore, the range of photon frequencies trapped and accelerated is determined by the amplitude of the density wake. ©2010 American Institute of Physics
History: Received 3 February 2010; accepted 4 June 2010; published 14 July 2010
Permalink: http://link.aip.org/link/?PHPAEN/17/073102/1

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