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Title: Comparative study of active plasma lenses in high-quality electron accelerator transport lines

Abstract

Electrically discharged active plasma lenses (APLs) are actively pursued in compact high-brightness plasma-based accelerators due to their high-gradient, tunable, and radially symmetric focusing properties. In this paper, the APL is experimentally compared with a conventional quadrupole triplet, highlighting the favorable reduction in the energy dependence (chromaticity) in the transport line. Through transport simulations, it is explored how the non-uniform radial discharge current distribution leads to beam-integrated emittance degradation and a charge density reduction at focus. However, positioning an aperture at the APL entrance will significantly reduce emittance degradation without additional loss of charge in the high-quality core of the beam. An analytical model is presented that estimates the emittance degradation from a short beam driving a longitudinally varying wakefield in the APL. Finally, optimizing laser plasma accelerator operation is discussed where emittance degradation from the non-uniform discharge current (favoring small beams inside the APL) and wakefield effects (favoring larger beam sizes) is minimized.

Authors:
 [1];  [1];  [1];  [1];  [2]; ORCiD logo [1];  [1]; ORCiD logo [2]
  1. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States)
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA), Office of Defense Nuclear Nonproliferation (NA-20); National Science Foundation (NSF); Gordon & Betty Moore Foundation (United States)
OSTI Identifier:
1439242
Alternate Identifier(s):
OSTI ID: 1425715
Grant/Contract Number:  
AC02-05CH11231; PHY-1415596; PHY-1632796; GBMF4898
Resource Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 25; Journal Issue: 5; Journal ID: ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; 43 PARTICLE ACCELERATORS; spectroscopy; optical metrology; magnetic equipment; charged currents; particle accelerators; lenses; fundamental constants; plasma density; electrostatics; combustion

Citation Formats

van Tilborg, J., Barber, S. K., Benedetti, C., Schroeder, C. B., Isono, F., Tsai, H. -E., Geddes, C. G. R., and Leemans, W. P. Comparative study of active plasma lenses in high-quality electron accelerator transport lines. United States: N. p., 2018. Web. doi:10.1063/1.5018001.
van Tilborg, J., Barber, S. K., Benedetti, C., Schroeder, C. B., Isono, F., Tsai, H. -E., Geddes, C. G. R., & Leemans, W. P. Comparative study of active plasma lenses in high-quality electron accelerator transport lines. United States. doi:10.1063/1.5018001.
van Tilborg, J., Barber, S. K., Benedetti, C., Schroeder, C. B., Isono, F., Tsai, H. -E., Geddes, C. G. R., and Leemans, W. P. Tue . "Comparative study of active plasma lenses in high-quality electron accelerator transport lines". United States. doi:10.1063/1.5018001. https://www.osti.gov/servlets/purl/1439242.
@article{osti_1439242,
title = {Comparative study of active plasma lenses in high-quality electron accelerator transport lines},
author = {van Tilborg, J. and Barber, S. K. and Benedetti, C. and Schroeder, C. B. and Isono, F. and Tsai, H. -E. and Geddes, C. G. R. and Leemans, W. P.},
abstractNote = {Electrically discharged active plasma lenses (APLs) are actively pursued in compact high-brightness plasma-based accelerators due to their high-gradient, tunable, and radially symmetric focusing properties. In this paper, the APL is experimentally compared with a conventional quadrupole triplet, highlighting the favorable reduction in the energy dependence (chromaticity) in the transport line. Through transport simulations, it is explored how the non-uniform radial discharge current distribution leads to beam-integrated emittance degradation and a charge density reduction at focus. However, positioning an aperture at the APL entrance will significantly reduce emittance degradation without additional loss of charge in the high-quality core of the beam. An analytical model is presented that estimates the emittance degradation from a short beam driving a longitudinally varying wakefield in the APL. Finally, optimizing laser plasma accelerator operation is discussed where emittance degradation from the non-uniform discharge current (favoring small beams inside the APL) and wakefield effects (favoring larger beam sizes) is minimized.},
doi = {10.1063/1.5018001},
journal = {Physics of Plasmas},
number = 5,
volume = 25,
place = {United States},
year = {2018},
month = {3}
}

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    Works referencing / citing this record:

    Compact Multistage Plasma-Based Accelerator Design for Correlated Energy Spread Compensation
    journal, July 2019


    Skew Quadrupole Effect of Laser Plasma Electron Beam Transport
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