Reproducibility of electron beams from laser wakefield acceleration in capillary tubes

F. G. Desforges, Martin Hansson, J. Ju, Lovisa Senje, T. L. Audet, S. Dobosz-Dufrenoy, Anders Persson, Olle Lundh, Claes-Göran Wahlström, B. Cros

Research output: Contribution to journalArticlepeer-review

7 Citations (SciVal)

Abstract

The stability of accelerated electron beams produced by self injection of plasma electrons into the wakefield driven by a laser pulse guided inside capillary tubes is analyzed statistically in relation to laser and plasma parameters, and compared to results obtained in a gas jet. The analysis shows that reproducible electron beams are achieved with a charge of 66 pC +/- 11%, a FWHM beam divergence of 9 mrad +/- 14%, a maximum energy of 120 MeV +/- 10% and pointing fluctuations of 2.3 mrad using 10 mm long, 178 mu m diameter capillary tubes at an electron density of (10.0 +/- 1.5) x 10(18) cm(-3). Active stabilization of the laser pointing was used and laser parameters were recorded on each shot. Although the shot-to-shot laser energy fluctuations can account for a fraction of the electrons fluctuations, gas density fluctuations are suspected to be a more important source of instability. (C) 2013 Elsevier B.V. All rights reserved.

Subject classification (UKÄ)

  • Accelerator Physics and Instrumentation

Keywords

  • Laser wakefield
  • Laser plasma accelerator
  • Electron acceleration
  • Capillary tube
  • Electron beans stability

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