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

Abstract

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.

Authors:
 [1]; ; ;  [1];  [2];  [3]; ; ;  [3]; ;  [4]
  1. Department of Physics and Astronomy, University of California, Los Angeles, California 90095 (United States)
  2. Far-Tech, Inc., San Diego, California 92121 (United States)
  3. Fermi National Accelerator Laboratory, Batavia, Illinois 60510 (United States)
  4. University of Rochester, Rochester, New York 14627 (United States)
Publication Date:
OSTI Identifier:
21389134
Resource Type:
Journal Article
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 17; Journal Issue: 7; Other Information: DOI: 10.1063/1.3457924; (c) 2010 American Institute of Physics; Journal ID: ISSN 1070-664X
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ELECTROMAGNETIC LENSES; ELECTRON BEAMS; FOCUSING; GEOMETRICAL ABERRATIONS; PLASMA SIMULATION; BEAMS; LENSES; LEPTON BEAMS; PARTICLE BEAMS; SIMULATION

Citation Formats

Thompson, M C, Lawrence Livermore National Laboratory, Livermore, California 94551, Badakov, H, Rosenzweig, J B, Travish, G, Barov, N, Piot, P, Department of Physics, Northern Illinois University, DeKalb, Illinois 60115, Fliller, R, Kazakevich, G M, Santucci, J, Li, J, and Tikhoplav, R. Observations of low-aberration plasma lens focusing of relativistic electron beams at the underdense threshold. United States: N. p., 2010. Web. doi:10.1063/1.3457924.
Thompson, M C, Lawrence Livermore National Laboratory, Livermore, California 94551, Badakov, H, Rosenzweig, J B, Travish, G, Barov, N, Piot, P, Department of Physics, Northern Illinois University, DeKalb, Illinois 60115, Fliller, R, Kazakevich, G M, Santucci, J, Li, J, & Tikhoplav, R. Observations of low-aberration plasma lens focusing of relativistic electron beams at the underdense threshold. United States. https://doi.org/10.1063/1.3457924
Thompson, M C, Lawrence Livermore National Laboratory, Livermore, California 94551, Badakov, H, Rosenzweig, J B, Travish, G, Barov, N, Piot, P, Department of Physics, Northern Illinois University, DeKalb, Illinois 60115, Fliller, R, Kazakevich, G M, Santucci, J, Li, J, and Tikhoplav, R. Thu . "Observations of low-aberration plasma lens focusing of relativistic electron beams at the underdense threshold". United States. https://doi.org/10.1063/1.3457924.
@article{osti_21389134,
title = {Observations of low-aberration plasma lens focusing of relativistic electron beams at the underdense threshold},
author = {Thompson, M C and Lawrence Livermore National Laboratory, Livermore, California 94551 and Badakov, H and Rosenzweig, J B and Travish, G and Barov, N and Piot, P and Department of Physics, Northern Illinois University, DeKalb, Illinois 60115 and Fliller, R and Kazakevich, G M and Santucci, J and Li, J and Tikhoplav, R},
abstractNote = {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.},
doi = {10.1063/1.3457924},
url = {https://www.osti.gov/biblio/21389134}, journal = {Physics of Plasmas},
issn = {1070-664X},
number = 7,
volume = 17,
place = {United States},
year = {2010},
month = {7}
}