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Observations of low-aberration plasma lens focusing of relativistic electron beams at the underdense threshold

Source: Phys. Plasmas 17, 073105 (2010); doi:10.1063/1.3457924

Published 21 July 2010

KEYWORDS and PACS
Keywords
PACS
  • 52.40.Mj
    Particle beam interactions in plasmas
  • 41.75.Ht
    Relativistic electron and positron beams
  • 29.27.Eg
    Beam handling; beam transport in accelerators
  • 52.35.Mw
    Nonlinear phenomena: plasma waves, wave propagation and other interactions
  • YEAR: 2010
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PUBLICATION DATA
ISSN:
1553-9601 (online)
Publisher:
AIP is a member of CrossRef AIP
M. C. Thompson,1,2 H. Badakov,1 J. B. Rosenzweig,1 G. Travish,1 N. Barov,3 P. Piot,4,5 R. Fliller,4 G. M. Kazakevich,4 J. Santucci,4 J. Li,6 and R. Tikhoplav6
1Department of Physics and Astronomy, University of California, Los Angeles, California 90095, USA
2Lawrence Livermore National Laboratory, Livermore, California 94551, USA
3Far-Tech, Inc., San Diego, California 92121, USA
4Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA
5Department of Physics, Northern Illinois University, DeKalb, Illinois 60115, USA
6University of Rochester, Rochester, New York 14627, USA
Focusing of a 15 MeV electron bunch by a plasma lens operated at the threshold of the underdense regime has been demonstrated. The strong, 1.7 cm focal length, plasma lens focused both transverse directions simultaneously and reduced the minimum area of the beam spot by a factor of 23. It is shown through analytic analysis and simulation that the observed spherical aberration of this underdense lens, when expressed as the fractional departure of the focusing strength from its linear expectation, is DeltaK/K=0.08±0.04. This is significantly lower than the minimum theoretical value for the spherical aberration of an overdense plasma lens. Parameter scans showing the dependence of focusing performance on beam charge, as well as time resolved measurements of the focused electron bunch, are reported. ©2010 American Institute of Physics
History: Received 18 January 2010; accepted 7 June 2010; published 21 July 2010
Permalink: http://link.aip.org/link/?PHPAEN/17/073105/1

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