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Proceedings Paper

Analysis of electron injection in laser wakefield acceleration using betatron emission in capillary tubes
Author(s): F. G. Desforges; B. S. Paradkar; M. Hansson; Thomas L. Audet; Jinchuan Ju; I. Gallardo-González; B. Aurand; P. Lee; Lovisa Senje; Anders Persson; Sandrine Dobosz-Dufrénoy; Olle Lundh; Gilles Maynard; Pascal Monot; Jean-Luc Vay; Claes-Göran Wahlström; Brigitte Cros
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Paper Abstract

The dynamics of ionization-induced electron injection in the high density (~ 1:2 × 1019cm-3) regime of Laser Wakefield Acceleration (LWFA) was investigated by analyzing betatron X-ray emission inside dielectric capillary tubes. A comparative study of the electron and betatron X-ray properties was performed for both self-injection and ionization-induced injection. Direct experimental evidence of early onset of ionization-induced injection into the plasma wave was obtained by mapping the X-ray emission zone inside the plasma. Particle-In-Cell (PIC) simulations showed that the early onset of ionization-induced injection, due to its lower trapping threshold, suppresses self-injection of electrons. An increase of X-ray fluence by at least a factor of two was observed in the case of ionization-induced injection due to an increased trapped charge compared to self-injection mechanism.

Paper Details

Date Published: 14 May 2015
PDF: 11 pages
Proc. SPIE 9514, Laser Acceleration of Electrons, Protons, and Ions III; and Medical Applications of Laser-Generated Beams of Particles III, 95140Z (14 May 2015); doi: 10.1117/12.2178654
Show Author Affiliations
F. G. Desforges, Lab. de Physique des Gaz et des Plasmas, Univ. Paris-Sud, CNRS (France)
B. S. Paradkar, Lab. de Physique des Gaz et des Plasmas, Univ. Paris-Sud, CNRS (France)
M. Hansson, Lund Univ. (Sweden)
Thomas L. Audet, Univ. Paris-Sud 11 (France)
Jinchuan Ju, Univ. Paris-Sud 11 (France)
I. Gallardo-González, Lund Univ. (Sweden)
B. Aurand, Lund Univ. (Sweden)
P. Lee, Lab. de Physique des Gaz et des Plasmas, Univ. Paris-Sud, CNRS (France)
Lovisa Senje, Lund Univ. (Sweden)
Anders Persson, Lund Univ. (Sweden)
Sandrine Dobosz-Dufrénoy, CEA-Ctr. de SACLAY (France)
Olle Lundh, Lund Univ. (Sweden)
Gilles Maynard, Univ. Paris-Sud 11 (France)
Pascal Monot, CEA-Ctr. de SACLAY (France)
Jean-Luc Vay, Lawrence Berkeley National Lab. (United States)
Claes-Göran Wahlström, Lund Univ. (Sweden)
Brigitte Cros, Univ. Paris-Sud 11 (France)


Published in SPIE Proceedings Vol. 9514:
Laser Acceleration of Electrons, Protons, and Ions III; and Medical Applications of Laser-Generated Beams of Particles III
Kenneth W. D. Ledingham; Eric Esarey; Carl B. Schroeder; Klaus Spohr; Paul McKenna; Florian J. Grüner; Paul R. Bolton, Editor(s)

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