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Stable, tunable, quasimonoenergetic electron beams produced in a laser wakefield near the threshold for self-injection
Physical Review Special Topics - Accelerators and Beams (2013)
  • Sudeep Banerjee
  • Serguei Y. Kalmykov
  • Nathan D. Powers
  • Gregory Golovin
  • Vidiya Ramanathan
  • Nathan J. Cunningham
  • Kevin J. Brown
  • Shouyuan Chen
  • Isaac Ghebregziabher
  • Bradley A. Shadwick
  • Donald P. Umstadter
  • Benjamin A. Cowan
  • David L. Bruhwiler
  • Arnaud Beck
  • Erik 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, ~ 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.

Keywords
  • Laser wakefield acceleration,
  • electron self-injection,
  • relativistic self-focusing,
  • PIC simulations CALDER-Circ code
Publication Date
Spring March 25, 2013
Citation Information
Sudeep Banerjee, Serguei Y. Kalmykov, Nathan D. Powers, Gregory Golovin, et al.. "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 Iss. 3 (2013)
Available at: http://works.bepress.com/donald_umstadter/24/