9 May 2013 Low transverse emittance electron bunches from two-color laser-ionization injection
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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, Lu-Le Yu, Eric Esarey, Eric Esarey, Jean-Luc Vay, Jean-Luc Vay, Carl B. Schroeder, Carl B. Schroeder, Carlo Benedetti, Carlo Benedetti, Cameron G. R. Geddes, Cameron G. R. Geddes, Sergey G. Rykovanov, Sergey G. Rykovanov, Stepan S. Bulanov, Stepan S. Bulanov, Min Chen, Min Chen, Wim P. Leemans, 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); doi: 10.1117/12.2021089; https://doi.org/10.1117/12.2021089

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