Low transverse emittance electron bunches from two-color laser-ionization injection

Lu-Le Yu; Eric Esarey; Jean-Luc Vay; Carl B. Schroeder; Carlo Benedetti; Cameron G. R. Geddes; Sergey G. Rykovanov; Stepan S. Bulanov; Min Chen; Wim P. Leemans

doi:10.1117/12.2021089

9 May 2013 Low transverse emittance electron bunches from two-color laser-ionization injection

Lu-Le Yu, Eric Esarey, Jean-Luc Vay, Carl B. Schroeder, Carlo Benedetti, Cameron G. R. Geddes, Sergey G. Rykovanov, Stepan S. Bulanov, Min Chen, Wim P. Leemans

Author Affiliations +

Proceedings Volume 8779, Laser Acceleration of Electrons, Protons, and Ions II; and Medical Applications of Laser-Generated Beams of Particles II; and Harnessing Relativistic Plasma Waves III; 877908 (2013) https://doi.org/10.1117/12.2021089
Event: SPIE Optics + Optoelectronics, 2013, Prague, Czech Republic

Abstract

A method is proposed to generate low emittance electron bunches from two color laser pulses in a laser-plasma accelerator. A two-region gas structure is used, containing a short region of a high-Z gas (e.g., krypton) for ionization injection, followed by a longer region of a low-Z gas for post-acceleration. A long-laser-wavelength (e.g., 5 μm) pump pulse excites plasma wake without triggering the inner-shell electron ionization of the high-Z gas due to low electric fields. A short-laser-wavelength (e.g., 0.4 μm) injection pulse, located at a trapping phase of the wake, ionizes the inner-shell electrons of the high-Z gas, resulting in ionization-induced trapping. Compared with a single-pulse ionization injection, this scheme offers an order of magnitude smaller residual transverse momentum of the electron bunch, which is a result of the smaller vector potential amplitude of the injection pulse.

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Lu-Le Yu, Eric Esarey, Jean-Luc Vay, Carl B. Schroeder, Carlo Benedetti, Cameron G. R. Geddes, Sergey G. Rykovanov, Stepan S. Bulanov, Min Chen, and Wim P. Leemans "Low transverse emittance electron bunches from two-color laser-ionization injection", Proc. SPIE 8779, Laser Acceleration of Electrons, Protons, and Ions II; and Medical Applications of Laser-Generated Beams of Particles II; and Harnessing Relativistic Plasma Waves III, 877908 (9 May 2013); https://doi.org/10.1117/12.2021089

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