• Editors' Suggestion

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

Phys. Rev. ST Accel. Beams 16, 031302 – Published 25 March 2013
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, D. P. Umstadter, B. M. Cowan, D. L. Bruhwiler, A. Beck, and E. Lefebvre

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, 10pC 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.

DOI: http://dx.doi.org/10.1103/PhysRevSTAB.16.031302

  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
3 More
  • Received 1 November 2012
  • Published 25 March 2013

Published by the American Physical Society under the terms of the 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.

Published by the American Physical Society

CHORUS
Article part of CHORUS

Authors & Affiliations

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, and D. P. Umstadter

  • Department of Physics and Astronomy, University of Nebraska, Lincoln, Nebraska 68588-0299, USA

B. M. Cowan and D. L. Bruhwiler§

  • Tech-X Corporation, 5621 Arapahoe Avenue, Suite A, Boulder, Colorado 80303, USA

A. Beck** and E. Lefebvre

  • CEA, DAM, DIF, 91297 Arpajon Cedex, France

  • *Corresponding author.sudeep@unl.edu
  • Present address: Rensselaer Polytechnic Institute, Troy, New York 12180-3590, USA.
  • Present address: Nebraska Wesleyan University, Lincoln, Nebraska 68504-2794, USA.
  • §Present address: University of Colorado at Boulder, 390 UCB, Boulder, Colorado 80309-0390, USA.
  • **Present address: UMR 7638, Laboratoire Leprince-Ringuet, Ecole polytechnique, 91128 Palaiseau Cedex, France.

Article Text

Click to Expand

References

Authorization Required


×
×

Images

×

Log In

Cancel
×

Search


Article Lookup
Paste a citation or DOI

Enter a citation
×