Ultra-low emittance beam generation using two-color ionization injection in laser-plasma accelerators

C. B. Schroeder; Carlo Benedetti; Stepan Bulanov; Min Chen; Eric Esarey; Cameron C. G. R. Geddes; Jean-Luc Vay; Lule Yu; W. P. Leemans

doi:10.1117/12.2178577

14 May 2015 Ultra-low emittance beam generation using two-color ionization injection in laser-plasma accelerators

C. B. Schroeder, Carlo Benedetti, Stepan Bulanov, Min Chen, Eric Esarey, Cameron C. G. R. Geddes, Jean-Luc Vay, Lule Yu, W. P. Leemans

Author Affiliations +

Proceedings Volume 9514, Laser Acceleration of Electrons, Protons, and Ions III; and Medical Applications of Laser-Generated Beams of Particles III; 951408 (2015) https://doi.org/10.1117/12.2178577
Event: SPIE Optics + Optoelectronics, 2015, Prague, Czech Republic

Abstract

Ultra-low emittance (tens of nm) beams can be generated in a plasma accelerator using ionization injection of electrons into a wakefield. An all-optical method of beam generation uses two laser pulses of different colors. A long-wavelength drive laser pulse (with a large ponderomotive force and small peak electric field) is used to excite a large wakefield without fully ionizing a gas, and a short-wavelength injection laser pulse (with a small ponderomotive force and large peak electric field), co-propagating and delayed with respect to the pump laser, to ionize a fraction of the remaining bound electrons at a trapped wake phase, generating an electron beam that is accelerated in the wake. The trapping condition, the ionized electron distribution, and the trapped bunch dynamics are discussed. Expressions for the beam transverse emittance, parallel and orthogonal to the ionization laser polarization, are derived. An example is presented using a 10-µm CO₂ laser to drive the wake and a frequency-doubled Ti:Al₂O₃ laser for ionization injection.

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C. B. Schroeder, Carlo Benedetti, Stepan Bulanov, Min Chen, Eric Esarey, Cameron C. G. R. Geddes, Jean-Luc Vay, Lule Yu, and W. P. Leemans "Ultra-low emittance beam generation using two-color ionization injection in laser-plasma accelerators", Proc. SPIE 9514, Laser Acceleration of Electrons, Protons, and Ions III; and Medical Applications of Laser-Generated Beams of Particles III, 951408 (14 May 2015); https://doi.org/10.1117/12.2178577

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