Generation of focusing ion beams by magnetized electron sheath acceleration

Weichman, K.; Santos, J. J.; Fujioka, S.; Toncian, T.; Arefiev, A. V.

doi:10.1038/s41598-020-75915-8

Title: Generation of focusing ion beams by magnetized electron sheath acceleration

Journal Article · 03 November 2020 · Scientific Reports

DOI: https://doi.org/10.1038/s41598-020-75915-8 · OSTI ID:1698156

Weichman, K.; Santos, J. J.; Fujioka, S.; Toncian, T.; Arefiev, A. V.

Abstract We present the first 3D fully kinetic simulations of laser driven sheath-based ion acceleration with a kilotesla-level applied magnetic field. The application of a strong magnetic field significantly and beneficially alters sheath based ion acceleration and creates two distinct stages in the acceleration process associated with the time-evolving magnetization of the hot electron sheath. The first stage delivers dramatically enhanced acceleration, and the second reverses the typical outward-directed topology of the sheath electric field into a focusing configuration. The net result is a focusing, magnetic field-directed ion source of multiple species with strongly enhanced energy and number. The predicted improvements in ion source characteristics are desirable for applications and suggest a route to experimentally confirm magnetization-related effects in the high energy density regime. We additionally perform a comparison between 2D and 3D simulation geometry, on which basis we predict the feasibility of observing magnetic field effects under experimentally relevant conditions.

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Research Organization:: Krell Institute, Ames, IA (United States); Univ. of California, San Diego, CA (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC)

Grant/Contract Number:: AC02-05CH11231; FG02-97ER25308; SC0018312

OSTI ID:: 1698156

Journal Information:: Scientific Reports, Journal Name: Scientific Reports Journal Issue: 1 Vol. 10; ISSN 2045-2322

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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