14 May 2015 Ultra-low emittance beam generation using two-color ionization injection in laser-plasma accelerators
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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.
© (2015) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
C. B. Schroeder, C. B. Schroeder, Carlo Benedetti, Carlo Benedetti, Stepan Bulanov, Stepan Bulanov, Min Chen, Min Chen, Eric Esarey, Eric Esarey, Cameron C. G. R. Geddes, Cameron C. G. R. Geddes, Jean-Luc Vay, Jean-Luc Vay, Lule Yu, Lule Yu, W. P. Leemans, 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); doi: 10.1117/12.2178577; https://doi.org/10.1117/12.2178577

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