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Title: Nonuniform discharge currents in active plasma lenses

Abstract

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.

Authors:
 [1];  [1];  [1];  [2];  [1];  [1];  [1];  [1];  [1];  [1];  [3];  [3];  [2]
+ Show Author Affiliations
  1. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States)
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States). Department of Physics
  3. Keldysh Institute of Applied Mathematics, Moscow (Russia)
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25); USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1348281
Alternate Identifier(s):
OSTI ID: 1439217
Grant/Contract Number:  
AC02-05CH11231
Resource Type:
Published Article
Journal Name:
Physical Review Accelerators and Beams
Additional Journal Information:
Journal Volume: 20; Journal Issue: 3; Related Information: © 2017 authors. Published by the American Physical Society.; Journal ID: ISSN 2469-9888
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS

Citation Formats

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., and Leemans, W. P. Nonuniform discharge currents in active plasma lenses. United States: N. p., 2017. Web. doi:10.1103/PhysRevAccelBeams.20.032803.
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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. Nonuniform discharge currents in active plasma lenses. United States. doi:10.1103/PhysRevAccelBeams.20.032803.
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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., and Leemans, W. P. Fri . "Nonuniform discharge currents in active plasma lenses". United States. doi:10.1103/PhysRevAccelBeams.20.032803.
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@article{osti_1348281,
title = {Nonuniform discharge currents in active plasma lenses},
author = {van Tilborg, J. and Barber, S. K. and Tsai, H. -E. and Swanson, K. K. and Steinke, S. and Geddes, C. G. R. and Gonsalves, A. J. and Schroeder, C. B. and Esarey, E. and Bulanov, S. S. and Bobrova, N. A. and Sasorov, P. V. and Leemans, W. P.},
abstractNote = {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.},
doi = {10.1103/PhysRevAccelBeams.20.032803},
journal = {Physical Review Accelerators and Beams},
number = 3,
volume = 20,
place = {United States},
year = {2017},
month = {3}
}
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Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1103/PhysRevAccelBeams.20.032803
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Cited by: 13 works
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Figures / Tables:

FIG. 1. FIG. 1.: MHD simulations of a 1-mm-diameter plasma lens yield the radial distribution of (a) the electron temperature and plasma density, (b) the transverse current density, and (c) the magnetic field profile. A simplified model was proposed (plotted as solid blue curves), based on J(r) ∝ Te(r)3/2, with Te(r) ∝more » u(r)2/7 as described in Ref. [34]. One can observe an approximately 35% enhancement in near-axis current density and B-field gradients.« less
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