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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]
+ Show Author Affiliations
  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.
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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. https://doi.org/10.1088/1361-6587/aaade1
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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. https://doi.org/10.1088/1361-6587/aaade1. https://www.osti.gov/servlets/purl/1469468.
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@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 = {Wed Feb 28 00:00:00 EST 2018},
month = {Wed Feb 28 00:00:00 EST 2018}
}
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Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.1088/1361-6587/aaade1
Copyright Statement
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Cited by: 12 works
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Figures / Tables:

Figure 1 Figure 1: Experimental setup. The thick red line shows the main laser pulse being focused by the f/6 OAP system at the entrance of the gas cell. The laser is linearly polarized in the plane of the page. The thin red line shows the probe for the Michelson interferometer. Amore » typical interferogram is shown. The electrons are dispersed by the 0.92 T dipole magnet onto a scintillator or a LANEX and imaged by a PI-MAX 3 camera. The dipole magnet and screen could be rotated by 900 so that the electron beams could be dispersed parallel or orthogonal to the laser polarization. The dipole magnet typically was located 3.2 cm downstream from the gas cell, and the distance from the end of the magnet to the screen was 7.0 cm. A typical measured electron spectrum is shown.« less
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    Works referencing / citing this record:

    Direct laser acceleration of electrons in the plasma bubble by tightly focused laser pulses
    journal, August 2019

    • Wang, Tianhong; Khudik, Vladimir; Arefiev, Alexey
    • Physics of Plasmas, Vol. 26, Issue 8
    • DOI: 10.1063/1.5110407

    Well collimated MeV electron beam generation in the plasma channel from relativistic laser-solid interaction
    journal, June 2019

    • Tsymbalov, I.; Gorlova, D.; Shulyapov, S.
    • Plasma Physics and Controlled Fusion, Vol. 61, Issue 7
    • DOI: 10.1088/1361-6587/ab1e1d
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