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Cold Optical Injection Producing Monoenergetic, Multi-GeV Electron Bunches

Abstract : A cold optical injection mechanism for a laser-plasma accelerator is described. It relies on a short, circularly polarized, low-energy laser pulse counterpropagating to and colliding with a circularly polarized main pulse in a low density plasma. Contrary to previously published optical injection schemes, injection is not caused here by electron heating. Instead, the collision between the pulses creates a spatially periodic and time-independent beat force. This force can block the longitudinal electron motion, leading to their entry and injection into the propagating wake. In a specific setup, we compute after acceleration over 0.6 mm, a 60 MeV, 50 pC electron bunch with 0.7 MeV rms energy spread, proving the interest of this scheme to inject electron bunches with a narrow absolute energy spread. Acceleration to 3 GeV with a rms spread smaller than 1% is computed after propagation over 3.8 cm in a plasma channel.
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Contributor : Thuy Le <>
Submitted on : Wednesday, July 7, 2010 - 5:44:39 PM
Last modification on : Wednesday, December 2, 2020 - 5:38:03 PM




X. Davoine, E. Lefebvre, Clément Rechatin, Jérôme Faure, Victor Malka. Cold Optical Injection Producing Monoenergetic, Multi-GeV Electron Bunches. Physical Review Letters, American Physical Society, 2009, 102 (6), pp.065001. ⟨10.1103/PhysRevLett.102.065001⟩. ⟨hal-00498553⟩



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