Stable, tunable, quasimonoenergetic electron beams produced in a laser wakefield near the threshold for self-injection

S. Banerjee, S. Y. Kalmykov, N. D. Powers, G. Golovin, V. Ramanathan, N. J. Cunningham, K. J. Brown, S. Chen, I. Ghebregziabher, B. A. Shadwick, Donald P Umstadter, B. M. Cowan, D. L. Bruhwiler, A. Beck, E. Lefebvre

Research output: Contribution to journalArticle

41 Citations (Scopus)

Abstract

Stable operation of a laser-plasma accelerator near the threshold for electron self-injection in the blowout regime has been demonstrated with 25-60 TW, 30 fs laser pulses focused into a 3-4 millimeter length gas jet. Nearly Gaussian shape and high nanosecond contrast of the focused pulse appear to be critically important for controllable, tunable generation of 250-430 MeV electron bunches with a low-energy spread, ∼10 pC charge, a few-mrad divergence and pointing stability, and a vanishingly small low-energy background. The physical nature of the near-threshold behavior is examined using three-dimensional particle-in-cell simulations. Simulations indicate that properly locating the nonlinear focus of the laser pulse within the plasma suppresses continuous injection, thus reducing the low-energy tail of the electron beam. Published by the American Physical Society Published by the American Physical Society under the terms of the xlink:href=http:// creativecommons.org/licenses/by/3.0/ Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

Original languageEnglish (US)
Article number031302
JournalPhysical Review Special Topics - Accelerators and Beams
Volume16
Issue number3
DOIs
StatePublished - Mar 25 2013

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electron beams
injection
thresholds
pulses
lasers
plasma accelerators
gas jets
laser plasmas
energy
divergence
electrons
simulation
cells

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Physics and Astronomy (miscellaneous)
  • Surfaces and Interfaces

Cite this

Stable, tunable, quasimonoenergetic electron beams produced in a laser wakefield near the threshold for self-injection. / Banerjee, S.; Kalmykov, S. Y.; Powers, N. D.; Golovin, G.; Ramanathan, V.; Cunningham, N. J.; Brown, K. J.; Chen, S.; Ghebregziabher, I.; Shadwick, B. A.; Umstadter, Donald P; Cowan, B. M.; Bruhwiler, D. L.; Beck, A.; Lefebvre, E.

In: Physical Review Special Topics - Accelerators and Beams, Vol. 16, No. 3, 031302, 25.03.2013.

Research output: Contribution to journalArticle

Banerjee, S, Kalmykov, SY, Powers, ND, Golovin, G, Ramanathan, V, Cunningham, NJ, Brown, KJ, Chen, S, Ghebregziabher, I, Shadwick, BA, Umstadter, DP, Cowan, BM, Bruhwiler, DL, Beck, A & Lefebvre, E 2013, 'Stable, tunable, quasimonoenergetic electron beams produced in a laser wakefield near the threshold for self-injection', Physical Review Special Topics - Accelerators and Beams, vol. 16, no. 3, 031302. https://doi.org/10.1103/PhysRevSTAB.16.031302
Banerjee, S. ; Kalmykov, S. Y. ; Powers, N. D. ; Golovin, G. ; Ramanathan, V. ; Cunningham, N. J. ; Brown, K. J. ; Chen, S. ; Ghebregziabher, I. ; Shadwick, B. A. ; Umstadter, Donald P ; Cowan, B. M. ; Bruhwiler, D. L. ; Beck, A. ; Lefebvre, E. / Stable, tunable, quasimonoenergetic electron beams produced in a laser wakefield near the threshold for self-injection. In: Physical Review Special Topics - Accelerators and Beams. 2013 ; Vol. 16, No. 3.
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