Dynamics of ionization-induced electron injection in the high density regime of laser wakefield acceleration

F. G. Desforges; B. S. Paradkar; Magnus Hansson; J. Ju; Lovisa Senje; T. L. Audet; A. Persson; S. Dobosz-Dufrenoy; Olle Lundh; G. Maynard; P. Monot; J. -L. Vay; Claes-Göran Wahlström; B. Cros

doi:10.1063/1.4903845

Dynamics of ionization-induced electron injection in the high density regime of laser wakefield acceleration

F. G. Desforges, B. S. Paradkar, Magnus Hansson, J. Ju, Lovisa Senje, T. L. Audet, A. Persson, S. Dobosz-Dufrenoy, Olle Lundh, G. Maynard, P. Monot, J. -L. Vay, Claes-Göran Wahlström, B. Cros

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Abstract

The dynamics of ionization-induced electron injection in high density (similar to 1.2 x 10(19) cm(-3)) regime of laser wakefield acceleration is investigated by analyzing the betatron X-ray emission. In such high density operation, the laser normalized vector potential exceeds the injection-thresholds of both ionization-injection and self-injection due to self-focusing. In this regime, direct experimental evidence of early on-set of ionization-induced injection into the plasma wave is given by mapping the X-ray emission zone inside the plasma. Particle-In-Cell simulations show that this early on-set of ionization-induced injection, due to its lower trapping threshold, suppresses the trapping of self-injected electrons. A comparative study of the electron and X-ray properties is performed for both self-injection and ionization-induced injection. An increase of X-ray fluence by at least a factor of two is observed in the case of ionization-induced injection due to increased trapped charge compared to self-injection mechanism. (C) 2014 AIP Publishing LLC.

Original language	English
Article number	120703
Journal	Physics of Plasmas
Volume	21
Issue number	12
DOIs	https://doi.org/10.1063/1.4903845
Publication status	Published - 2014

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Atom and Molecular Physics and Optics

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10.1063/1.4903845

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Desforges, F. G., Paradkar, B. S., Hansson, M., Ju, J., Senje, L., Audet, T. L., Persson, A., Dobosz-Dufrenoy, S., Lundh, O., Maynard, G., Monot, P., Vay, J. .-L., Wahlström, C.-G., & Cros, B. (2014). Dynamics of ionization-induced electron injection in the high density regime of laser wakefield acceleration. Physics of Plasmas, 21(12), Article 120703. https://doi.org/10.1063/1.4903845

@article{2e70edd397b248a1963b9c5ddc9c2ecf,

title = "Dynamics of ionization-induced electron injection in the high density regime of laser wakefield acceleration",

abstract = "The dynamics of ionization-induced electron injection in high density (similar to 1.2 x 10(19) cm(-3)) regime of laser wakefield acceleration is investigated by analyzing the betatron X-ray emission. In such high density operation, the laser normalized vector potential exceeds the injection-thresholds of both ionization-injection and self-injection due to self-focusing. In this regime, direct experimental evidence of early on-set of ionization-induced injection into the plasma wave is given by mapping the X-ray emission zone inside the plasma. Particle-In-Cell simulations show that this early on-set of ionization-induced injection, due to its lower trapping threshold, suppresses the trapping of self-injected electrons. A comparative study of the electron and X-ray properties is performed for both self-injection and ionization-induced injection. An increase of X-ray fluence by at least a factor of two is observed in the case of ionization-induced injection due to increased trapped charge compared to self-injection mechanism. (C) 2014 AIP Publishing LLC.",

author = "Desforges, {F. G.} and Paradkar, {B. S.} and Magnus Hansson and J. Ju and Lovisa Senje and Audet, {T. L.} and A. Persson and S. Dobosz-Dufrenoy and Olle Lundh and G. Maynard and P. Monot and Vay, {J. -L.} and Claes-G{\"o}ran Wahlstr{\"o}m and B. Cros",

year = "2014",

doi = "10.1063/1.4903845",

language = "English",

volume = "21",

journal = "Physics of Plasmas",

issn = "1070-664X",

publisher = "American Institute of Physics (AIP)",

number = "12",

}

TY - JOUR

T1 - Dynamics of ionization-induced electron injection in the high density regime of laser wakefield acceleration

AU - Desforges, F. G.

AU - Paradkar, B. S.

AU - Hansson, Magnus

AU - Ju, J.

AU - Senje, Lovisa

AU - Audet, T. L.

AU - Persson, A.

AU - Dobosz-Dufrenoy, S.

AU - Lundh, Olle

AU - Maynard, G.

AU - Monot, P.

AU - Vay, J. -L.

AU - Wahlström, Claes-Göran

AU - Cros, B.

PY - 2014

Y1 - 2014

N2 - The dynamics of ionization-induced electron injection in high density (similar to 1.2 x 10(19) cm(-3)) regime of laser wakefield acceleration is investigated by analyzing the betatron X-ray emission. In such high density operation, the laser normalized vector potential exceeds the injection-thresholds of both ionization-injection and self-injection due to self-focusing. In this regime, direct experimental evidence of early on-set of ionization-induced injection into the plasma wave is given by mapping the X-ray emission zone inside the plasma. Particle-In-Cell simulations show that this early on-set of ionization-induced injection, due to its lower trapping threshold, suppresses the trapping of self-injected electrons. A comparative study of the electron and X-ray properties is performed for both self-injection and ionization-induced injection. An increase of X-ray fluence by at least a factor of two is observed in the case of ionization-induced injection due to increased trapped charge compared to self-injection mechanism. (C) 2014 AIP Publishing LLC.

AB - The dynamics of ionization-induced electron injection in high density (similar to 1.2 x 10(19) cm(-3)) regime of laser wakefield acceleration is investigated by analyzing the betatron X-ray emission. In such high density operation, the laser normalized vector potential exceeds the injection-thresholds of both ionization-injection and self-injection due to self-focusing. In this regime, direct experimental evidence of early on-set of ionization-induced injection into the plasma wave is given by mapping the X-ray emission zone inside the plasma. Particle-In-Cell simulations show that this early on-set of ionization-induced injection, due to its lower trapping threshold, suppresses the trapping of self-injected electrons. A comparative study of the electron and X-ray properties is performed for both self-injection and ionization-induced injection. An increase of X-ray fluence by at least a factor of two is observed in the case of ionization-induced injection due to increased trapped charge compared to self-injection mechanism. (C) 2014 AIP Publishing LLC.

U2 - 10.1063/1.4903845

DO - 10.1063/1.4903845

M3 - Article

SN - 1070-664X

VL - 21

JO - Physics of Plasmas

JF - Physics of Plasmas

IS - 12

M1 - 120703

ER -

Dynamics of ionization-induced electron injection in the high density regime of laser wakefield acceleration

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