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

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. © (2015) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
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https://hal-cea.archives-ouvertes.fr/cea-01245756
Contributor : Caroline Lebe <>
Submitted on : Thursday, December 17, 2015 - 3:57:38 PM
Last modification on : Friday, October 16, 2020 - 3:41:08 AM

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F. G. Desforges, B. S. Paradkar, M. Hansson, T. L. Audet, J. Ju, et al.. Analysis of electron injection in laser wakefield acceleration using betatron emission in capillary tubes. Laser Acceleration of Electrons, Protons, and Ions III; and Medical Applications of Laser-Generated Beams of Particles III, Kenneth W. D. Ledingham; Klaus Spohr; Paul McKenna; Paul R. Bolton; Eric Esarey; Carl B. Schroeder; Florian J. Grüner, Apr 2015, Prague, Czech Republic. ⟨10.1117/12.2178654⟩. ⟨cea-01245756⟩

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