Nonuniform discharge currents in active plasma lenses

van Tilborg, J.; Barber, S. K.; Tsai, H. -E.; Swanson, K. K.; Steinke, S.; Geddes, C. G.  R.; Gonsalves, A. J.; Schroeder, C. B.; Esarey, E.; Bulanov, S. S.; Bobrova, N. A.; Sasorov, P. V.; Leemans, W. P.

doi:10.1103/PhysRevAccelBeams.20.032803

Title: Nonuniform discharge currents in active plasma lenses

Journal Article · 24 March 2017 · Physical Review Accelerators and Beams

DOI: https://doi.org/10.1103/PhysRevAccelBeams.20.032803 · OSTI ID:1348281

van Tilborg, J. ^[1]; Barber, S. K. ^[1]; Tsai, H. -E. ^[1]; Swanson, K. K. ^[2]; Steinke, S. ^[1]; Geddes, C. G. R. ^[1]; Gonsalves, A. J. ^[1]; Schroeder, C. B. ^[1]; Esarey, E. ^[1]; Bulanov, S. S. ^[1]; Bobrova, N. A. ^[3]; Sasorov, P. V. ^[3]; Leemans, W. P. ^[2]

Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States). Department of Physics
Keldysh Institute of Applied Mathematics, Moscow (Russia)

Active plasma lenses have attracted interest in novel accelerator applications due to their ability to provide large-field-gradient (short focal length), tunable, and radially symmetric focusing for charged particle beams. However, if the discharge current is not flowing uniformly as a function of radius, one can expect a radially varying field gradient as well as potential emittance degradation. We have investigated this experimentally for a 1-mm-diameter active plasma lens. The measured near-axis field gradient is approximately 35% larger than expected for a uniform current distribution, and at overfocusing currents ring-shaped electron beams are observed. These observations are explained by simulations.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP); USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1348281

Alternate ID(s):: OSTI ID: 1439217

Journal Information:: Physical Review Accelerators and Beams, Vol. 20, Issue 3; Related Information: © 2017 authors. Published by the American Physical Society.; ISSN 2469-9888

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 35 works

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