14 May 2015 Analysis of electron injection in laser wakefield acceleration using betatron emission in capillary tubes
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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, F. G. Desforges, B. S. Paradkar, B. S. Paradkar, M. Hansson, M. Hansson, Thomas L. Audet, Thomas L. Audet, Jinchuan Ju, Jinchuan Ju, I. Gallardo-González, I. Gallardo-González, B. Aurand, B. Aurand, P. Lee, P. Lee, Lovisa Senje, Lovisa Senje, Anders Persson, Anders Persson, Sandrine Dobosz-Dufrénoy, Sandrine Dobosz-Dufrénoy, Olle Lundh, Olle Lundh, Gilles Maynard, Gilles Maynard, Pascal Monot, Pascal Monot, Jean-Luc Vay, Jean-Luc Vay, Claes-Göran Wahlström, Claes-Göran Wahlström, Brigitte Cros, 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); doi: 10.1117/12.2178654; https://doi.org/10.1117/12.2178654
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