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Title: Experimental signatures of direct-laser-acceleration-assisted laser wakefield acceleration

Abstract

Here, the direct laser acceleration (DLA) of electrons in a laser wakefield accelerator (LWFA) operating in the forced or quasi-blowout regimes has been investigated through experiment and simulation. When there is a significant overlap between the trapped electrons and the drive laser in a LWFA cavity, the resulting electrons can gain energy from both the LWFA and the DLA mechanisms. Experimental work investigates the properties of the electron beams produced in a LWFA with ionization injection by dispersing those beams in the direction perpendicular to the laser polarization. These electron beams show certain spectral features that are characteristic of DLA. These characteristic features are reproduced using particle-in-cell simulations, where particle tracking was used to elucidate the roles of LWFA and DLA to the energy gain of the electrons in this experimental regime and to demonstrate that such spectral features are definitive signatures of the presence of DLA in LWFA.

Authors:
ORCiD logo [1]; ORCiD logo [2];  [3];  [4];  [3]
  1. Univ. of Rochester, NY (United States). Lab. for Laser Energetics; Univ. of California, Los Angeles, CA (United States). Dept. of Electrical Engineering
  2. Univ. of California, Los Angeles, CA (United States). Dept. of Electrical Engineering; Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  3. Univ. of California, Los Angeles, CA (United States). Dept. of Electrical Engineering
  4. Univ. of Rochester, NY (United States). Lab. for Laser Energetics
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA); National Science Foundation (NSF); New York State Energy Research and Development Authority (NYSERDA)
OSTI Identifier:
1469468
Report Number(s):
LLNL-JRNL-756438
Journal ID: ISSN 0741-3335; 943476
Grant/Contract Number:  
AC52-07NA27344; NA0001944; SC0017950; SC0010064; 1734315
Resource Type:
Accepted Manuscript
Journal Name:
Plasma Physics and Controlled Fusion
Additional Journal Information:
Journal Volume: 60; Journal Issue: 4; Journal ID: ISSN 0741-3335
Publisher:
IOP Science
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS

Citation Formats

Shaw, J. L., Lemos, N., Marsh, K. A., Froula, D. H., and Joshi, C. Experimental signatures of direct-laser-acceleration-assisted laser wakefield acceleration. United States: N. p., 2018. Web. doi:10.1088/1361-6587/aaade1.
Shaw, J. L., Lemos, N., Marsh, K. A., Froula, D. H., & Joshi, C. Experimental signatures of direct-laser-acceleration-assisted laser wakefield acceleration. United States. doi:10.1088/1361-6587/aaade1.
Shaw, J. L., Lemos, N., Marsh, K. A., Froula, D. H., and Joshi, C. Wed . "Experimental signatures of direct-laser-acceleration-assisted laser wakefield acceleration". United States. doi:10.1088/1361-6587/aaade1. https://www.osti.gov/servlets/purl/1469468.
@article{osti_1469468,
title = {Experimental signatures of direct-laser-acceleration-assisted laser wakefield acceleration},
author = {Shaw, J. L. and Lemos, N. and Marsh, K. A. and Froula, D. H. and Joshi, C.},
abstractNote = {Here, the direct laser acceleration (DLA) of electrons in a laser wakefield accelerator (LWFA) operating in the forced or quasi-blowout regimes has been investigated through experiment and simulation. When there is a significant overlap between the trapped electrons and the drive laser in a LWFA cavity, the resulting electrons can gain energy from both the LWFA and the DLA mechanisms. Experimental work investigates the properties of the electron beams produced in a LWFA with ionization injection by dispersing those beams in the direction perpendicular to the laser polarization. These electron beams show certain spectral features that are characteristic of DLA. These characteristic features are reproduced using particle-in-cell simulations, where particle tracking was used to elucidate the roles of LWFA and DLA to the energy gain of the electrons in this experimental regime and to demonstrate that such spectral features are definitive signatures of the presence of DLA in LWFA.},
doi = {10.1088/1361-6587/aaade1},
journal = {Plasma Physics and Controlled Fusion},
number = 4,
volume = 60,
place = {United States},
year = {2018},
month = {2}
}

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