4 August 2009 Parametric investigation of laser wakefield acceleration versus F-number of focusing optics
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Proceedings Volume 7386, Photonics North 2009; 738638 (2009) https://doi.org/10.1117/12.839825
Event: Photonics North 2009, 2009, Quebec, Canada
Laser wakefield acceleration is a growing area of research with the promise of generating high energy, low divergence, and short duration electron bunches from tabletop scale accelerators. To date, electron beams with maximum energy of 1 GeV with 2.5% energy spread have been generated using a 3cm plasma channel[1]. However in order to advance the maximum energy of electron beams beyond this limit, better understanding of the physics and effect of different parameters on the interaction are essential. In this paper we report on our parametric studies of wakefield electron acceleration using the 10TW chirped pulse amplified laser system at the Advanced Laser Light Source (ALLS), Montreal. Laser pulses with energies of ~210 mJ at 33fs were focused using a short (f/6) and a long focal length (f/12) off axis parabola onto 2mm supersonic helium and nitrogen gas jets at different pressures. Nitrogen with electron densities of up to 2×1020 cm-3 and helium densities up to 5×1019 were used. Beams with energies of tens of MeV were observed using the short focal length parabola and beams with energies of several MeV were observed using the long focal length parabola. We also found that electron beams are more easily generated with higher levels of prepulse, consistent with previous reports of prepulse generated guiding channels in the plasma[5].
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N. Vafaei-Najafabadi, N. Vafaei-Najafabadi, A. Ali, A. Ali, J. A. Chakera, J. A. Chakera, R. Fedosejevs, R. Fedosejevs, Y. Y. Tsui, Y. Y. Tsui, "Parametric investigation of laser wakefield acceleration versus F-number of focusing optics", Proc. SPIE 7386, Photonics North 2009, 738638 (4 August 2009); doi: 10.1117/12.839825; https://doi.org/10.1117/12.839825

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