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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}
}

Journal Article:
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Cited by: 1 work
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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 referenced in this record:

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Laser Electron Accelerator
journal, July 1979


High intensity laser-driven x-ray sources for high energy density science
conference, January 2015


Role of Direct Laser Acceleration of Electrons in a Laser Wakefield Accelerator with Ionization Injection
journal, February 2017


Synergistic Laser-Wakefield and Direct-Laser Acceleration in the Plasma-Bubble Regime
journal, May 2015


Self-Guiding of Ultrashort, Relativistically Intense Laser Pulses through Underdense Plasmas in the Blowout Regime
journal, April 2009


Generating multi-GeV electron bunches using single stage laser wakefield acceleration in a 3D nonlinear regime
journal, June 2007


X-Ray Emission from Betatron Motion in a Plasma Wiggler
journal, March 2002


Production of a keV X-Ray Beam from Synchrotron Radiation in Relativistic Laser-Plasma Interaction
journal, September 2004


Laser Injection of Ultrashort Electron Pulses into Wakefield Plasma Waves
journal, March 1996


Electron Injection into Plasma Wakefields by Colliding Laser Pulses
journal, October 1997


Beat wave injection of electrons into plasma waves using two interfering laser pulses
journal, July 2004


Particle injection into the wave acceleration phase due to nonlinear wake wave breaking
journal, November 1998


Plasma Electron Trapping and Acceleration in a Plasma Wake Field Using a Density Transition
journal, February 2001


Plasma-Density-Gradient Injection of Low Absolute-Momentum-Spread Electron Bunches
journal, May 2008


Density-transition based electron injector for laser driven wakefield accelerators
journal, September 2010

  • Schmid, K.; Buck, A.; Sears, C. M. S.
  • Physical Review Special Topics - Accelerators and Beams, Vol. 13, Issue 9
  • DOI: 10.1103/PhysRevSTAB.13.091301

Injection and Trapping of Tunnel-Ionized Electrons into Laser-Produced Wakes
journal, January 2010


Ionization-Induced Electron Trapping in Ultrarelativistic Plasma Wakes
journal, February 2007


Ionization Induced Trapping in a Laser Wakefield Accelerator
journal, January 2010


Ion-channel laser
journal, May 1990


High-energy inverse free-electron-laser accelerator
journal, November 1985


High Energy Gain of Trapped Electrons in a Tapered, Diffraction-Dominated Inverse-Free-Electron Laser
journal, April 2005


Laser-Driven Coherent Betatron Oscillation in a Laser-Wakefield Cavity
journal, March 2008


Generating Ultrarelativistic Attosecond Electron Bunches with Laser Wakefield Accelerators
journal, September 2010


Efficient harmonic microbunching in a 7th-order inverse-free-electron laser interaction
journal, May 2009

  • Tochitsky, S. Ya.; Williams, O. B.; Musumeci, P.
  • Physical Review Special Topics - Accelerators and Beams, Vol. 12, Issue 5
  • DOI: 10.1103/PhysRevSTAB.12.050703

Laser-Wakefield Acceleration of Monoenergetic Electron Beams in the First Plasma-Wave Period
journal, May 2006


Observation of Synchrotron Radiation from Electrons Accelerated in a Petawatt-Laser-Generated Plasma Cavity
journal, March 2008


Observation of Betatron X-Ray Radiation in a Self-Modulated Laser Wakefield Accelerator Driven with Picosecond Laser Pulses
journal, March 2017


    Works referencing / citing this record:

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      Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.