Skip to main content
Open Access Publications from the University of California

Comparative study of active plasma lenses in high-quality electron accelerator transport lines

  • Author(s): Van Tilborg, J;
  • Barber, SK;
  • Benedetti, C;
  • Schroeder, CB;
  • Isono, F;
  • Tsai, HE;
  • Geddes, CGR;
  • Leemans, WP
  • et al.

Published Web Location Commons 'BY-NC-ND' version 4.0 license

Electrically discharged active plasma lenses (APLs) are actively pursued in compact high-brightness plasma-based accelerators due to their high-gradient, tunable, and radially symmetric focusing properties. In this manuscript, the APL is experimentally compared with a conventional quadrupole triplet, highlighting the favorable reduction in the energy dependence (chromaticity) in the transport line. Through transport simulations, it is explored how the non-uniform radial discharge current distribution leads to beam-integrated emittance degradation and a charge density reduction at focus. However, positioning an aperture at the APL entrance will significantly reduce emittance degradation without additional loss of charge in the high-quality core of the beam. An analytical model is presented that estimates the emittance degradation from a short beam driving a longitudinally varying wakefield in the APL. Optimizing laser plasma accelerator operation is discussed where emittance degradation from the non-uniform discharge current (favoring small beams inside the APL) and wakefield effects (favoring larger beam sizes) is minimized.

Main Content
For improved accessibility of PDF content, download the file to your device.
Current View