Analysis of  electron injection in laser wakefield acceleration using betatron emission in capillary tubes

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

doi:10.1117/12.2178654

14 May 2015 Analysis of electron injection in laser wakefield acceleration using betatron emission in capillary tubes

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

Author Affiliations +

Proceedings Volume 9514, Laser Acceleration of Electrons, Protons, and Ions III; and Medical Applications of Laser-Generated Beams of Particles III; 95140Z (2015) https://doi.org/10.1117/12.2178654
Event: SPIE Optics + Optoelectronics, 2015, Prague, Czech Republic

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.

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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, and Brigitte Cros "Analysis of electron injection in laser wakefield acceleration using betatron emission in capillary tubes", 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); https://doi.org/10.1117/12.2178654

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KEYWORDS

X-rays

Argon

Capillaries

Nitrogen

Plasmas

Solids

Ionization

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