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Title: Ultra-low emittance beam generation using two-color ionization injection in a CO2 laser-driven plasma accelerator

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 presented. An example is shown using a 10-micron CO2 laser to drive the wake and a frequency-doubled Ti:Al2O3 laser for ionization injection.
Authors:
 [1] ;  [1] ;  [1] ;  [2] ;  [1] ;  [1] ;  [1] ;  [2] ;  [1]
  1. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  2. Shanghai Jiao Tong Univ. (China)
Publication Date:
OSTI Identifier:
1233743
Report Number(s):
LBNL--179526
ir:179526; TRN: US1600208
Resource Type:
Technical Report
Research Org:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). Accelerator & Fusion Research Division
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; CARBON DIOXIDE LASERS; ELECTRON BEAMS; INJECTION; COLOR; ELECTRONS; IONIZATION; PLASMA GUNS; TRAPPING; BEAM EMITTANCE; DISTRIBUTION; POLARIZATION; RUBY LASERS; WAKEFIELD ACCELERATORS