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Title: Simulation of monoenergetic electron generation via laser wakefield accelerators for 5-25 TW lasers

Abstract

In 2004, using a 3D particle-in-cell (PIC) model [F. S. Tsung et al., Phys. Rev. Lett. 93, 185004 (2004)], it was predicted that a 16.5 TW, 50 fs laser propagating through nearly 0.5 cm of 3x10{sup 18} cm{sup -3} preformed plasma channel would generate a monoenergetic bunch of electrons with a central energy of 240 MeV after 0.5 cm of propagation. In addition, electrons out to 840 MeV were seen if the laser propagated through 0.8 cm of the same plasma. The simulations showed that self-injection occurs after the laser intensity increases due to a combination of photon deceleration, group velocity dispersion, and self-focusing. The monoenergetic beam is produced because the injection process is clamped by beam loading and the rotation in phase space that results as the beam dephases. Nearly simultaneously [S. P. D. Mangles et al., Nature 431, 535 (2004); C. G. R. Geddes et al., ibid. 431, 538 (2004); J. Faure et al., ibid. 431, 541 (2004)] three experimental groups from around the world reported the generation of near nano-Coulomb of low emittance, monoenergetic electron beams using similar laser powers and pulse lengths as those reported in our simulations. Each of these experiments is modeled using themore » same 3D PIC code OSIRIS. The simulations indicate that although these experiments use a range of plasma parameters, density profiles, laser powers, and spot sizes; there are some commonalities to the mechanism for the generation of monoenergetic beams. Comments are given on how the energy and beam quality can be improved in the future.« less

Authors:
; ; ; ; ; ; ;  [1]
  1. University of California, Los Angeles, Los Angeles, California 90095 (United States)
Publication Date:
OSTI Identifier:
20783181
Resource Type:
Journal Article
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 13; Journal Issue: 5; Other Information: DOI: 10.1063/1.2198535; (c) 2006 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1070-664X
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ELECTRON BEAMS; ELECTRONS; LASERS; LIGHT TRANSMISSION; MEV RANGE; PHASE SPACE; PHOTONS; PLASMA; PLASMA DENSITY; PLASMA GUNS; PLASMA RADIAL PROFILES; PLASMA SIMULATION; PULSES; ROTATION; TERAWATT POWER RANGE; WAKEFIELD ACCELERATORS

Citation Formats

Tsung, F S, Lu, W, Tzoufras, M, Mori, W B, Joshi, C, Vieira, J M, Silva, L O, Fonseca, R A, and GoLP/CFP, Instituto Superior Tecnico, Lisbon. Simulation of monoenergetic electron generation via laser wakefield accelerators for 5-25 TW lasers. United States: N. p., 2006. Web. doi:10.1063/1.2198535.
Tsung, F S, Lu, W, Tzoufras, M, Mori, W B, Joshi, C, Vieira, J M, Silva, L O, Fonseca, R A, & GoLP/CFP, Instituto Superior Tecnico, Lisbon. Simulation of monoenergetic electron generation via laser wakefield accelerators for 5-25 TW lasers. United States. https://doi.org/10.1063/1.2198535
Tsung, F S, Lu, W, Tzoufras, M, Mori, W B, Joshi, C, Vieira, J M, Silva, L O, Fonseca, R A, and GoLP/CFP, Instituto Superior Tecnico, Lisbon. Mon . "Simulation of monoenergetic electron generation via laser wakefield accelerators for 5-25 TW lasers". United States. https://doi.org/10.1063/1.2198535.
@article{osti_20783181,
title = {Simulation of monoenergetic electron generation via laser wakefield accelerators for 5-25 TW lasers},
author = {Tsung, F S and Lu, W and Tzoufras, M and Mori, W B and Joshi, C and Vieira, J M and Silva, L O and Fonseca, R A and GoLP/CFP, Instituto Superior Tecnico, Lisbon},
abstractNote = {In 2004, using a 3D particle-in-cell (PIC) model [F. S. Tsung et al., Phys. Rev. Lett. 93, 185004 (2004)], it was predicted that a 16.5 TW, 50 fs laser propagating through nearly 0.5 cm of 3x10{sup 18} cm{sup -3} preformed plasma channel would generate a monoenergetic bunch of electrons with a central energy of 240 MeV after 0.5 cm of propagation. In addition, electrons out to 840 MeV were seen if the laser propagated through 0.8 cm of the same plasma. The simulations showed that self-injection occurs after the laser intensity increases due to a combination of photon deceleration, group velocity dispersion, and self-focusing. The monoenergetic beam is produced because the injection process is clamped by beam loading and the rotation in phase space that results as the beam dephases. Nearly simultaneously [S. P. D. Mangles et al., Nature 431, 535 (2004); C. G. R. Geddes et al., ibid. 431, 538 (2004); J. Faure et al., ibid. 431, 541 (2004)] three experimental groups from around the world reported the generation of near nano-Coulomb of low emittance, monoenergetic electron beams using similar laser powers and pulse lengths as those reported in our simulations. Each of these experiments is modeled using the same 3D PIC code OSIRIS. The simulations indicate that although these experiments use a range of plasma parameters, density profiles, laser powers, and spot sizes; there are some commonalities to the mechanism for the generation of monoenergetic beams. Comments are given on how the energy and beam quality can be improved in the future.},
doi = {10.1063/1.2198535},
url = {https://www.osti.gov/biblio/20783181}, journal = {Physics of Plasmas},
issn = {1070-664X},
number = 5,
volume = 13,
place = {United States},
year = {2006},
month = {5}
}