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Proceedings Paper

Ultra-low emittance beam generation using two-color ionization injection in laser-plasma accelerators
Author(s): C. B. Schroeder; Carlo Benedetti; Stepan Bulanov; Min Chen; Eric Esarey; Cameron C. G. R. Geddes; Jean-Luc Vay; Lule Yu; W. P. Leemans
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Paper 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.

Paper Details

Date Published: 14 May 2015
PDF: 7 pages
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
Show Author Affiliations
C. B. Schroeder, Lawrence Berkeley National Lab. (United States)
Carlo Benedetti, Lawrence Berkeley National Lab. (United States)
Stepan Bulanov, Lawrence Berkeley National Lab. (United States)
Min Chen, Shanghai Jiao Tong Univ. (China)
Eric Esarey, Lawrence Berkeley National Lab. (United States)
Cameron C. G. R. Geddes, Lawrence Berkeley National Lab. (United States)
Jean-Luc Vay, Lawrence Berkeley National Lab. (United States)
Lule Yu, Shanghai Jiao Tong Univ. (China)
W. P. Leemans, Lawrence Berkeley National Lab. (United States)


Published in SPIE Proceedings Vol. 9514:
Laser Acceleration of Electrons, Protons, and Ions III; and Medical Applications of Laser-Generated Beams of Particles III
Kenneth W. D. Ledingham; Eric Esarey; Carl B. Schroeder; Klaus Spohr; Paul McKenna; Florian J. Grüner; Paul R. Bolton, Editor(s)

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