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Direct measurement of focusing fields in active plasma lenses

  • Author(s): Röckemann, JH
  • Schaper, L
  • Barber, SK
  • Bobrova, NA
  • Boyle, G
  • Bulanov, S
  • Delbos, N
  • Floettmann, K
  • Kube, G
  • Lauth, W
  • Leemans, WP
  • Libov, V
  • Maier, AR
  • Meisel, M
  • Messner, P
  • Sasorov, PV
  • Schroeder, CB
  • Van Tilborg, J
  • Wesch, S
  • Osterhoff, J
  • et al.
Abstract

Active plasma lenses have the potential to enable broad-ranging applications of plasma-based accelerators owing to their compact design and radially symmetric kT/m-level focusing fields, facilitating beam-quality preservation and compact beam transport. We report on the direct measurement of magnetic field gradients in active plasma lenses and demonstrate their impact on the emittance of a charged particle beam. This is made possible by the use of a well-characterized electron beam with 1.4 mm mrad normalized emittance from a conventional accelerator. Field gradients of up to 823 T/m are investigated. The observed emittance evolution is supported by numerical simulations, which suggests the potential for conservation of the core beam emittance in such a plasma lens setup.

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