Location via proxy:   [ UP ]  
[Report a bug]   [Manage cookies]                
  • Letter
  • Open Access

Resonant excitation of plasma waves in a plasma channel

A. J. Ross, J. Chappell, J. J. van de Wetering, J. Cowley, E. Archer, N. Bourgeois, L. Corner, D. R. Emerson, L. Feder, X. J. Gu, O. Jakobsson, H. Jones, A. Picksley, L. Reid, W. Wang, R. Walczak, and S. M. Hooker
Phys. Rev. Research 6, L022001 – Published 3 April 2024
PDFHTMLExport Citation
Abstract
Authors
Article Text
  • ACKNOWLEDGMENTS
    • Supplemental Material
    References

    Abstract

    We demonstrate resonant excitation of a plasma wave by a train of short laser pulses guided in a preformed plasma channel, for parameters relevant to a plasma-modulated plasma accelerator (P-MoPA). We show experimentally that a train of N≈10 short pulses, of total energy ∼1J, can be guided through 110mm long plasma channels with on-axis densities in the range 1017–1018cm−3. The spectrum of the transmitted train is found to be strongly red shifted when the plasma period is tuned to the intratrain pulse spacing. Numerical simulations are found to be in excellent agreement with the measurements and indicate that the resonantly excited plasma waves have an amplitude in the range 3–10GVm−1, corresponding to an accelerator stage energy gain of order 1GeV.

    • Figure
    • Figure
    • Figure
    • Figure
    • Received 19 October 2023
    • Accepted 26 February 2024

    DOI:https://doi.org/10.1103/PhysRevResearch.6.L022001

    Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

    Published by the American Physical Society

    Physics Subject Headings (PhySH)

    1. Research Areas
    Plasma acceleration & new acceleration techniques
    Accelerators & BeamsPlasma Physics

    Authors & Affiliations

    A. J. Ross1, J. Chappell1, J. J. van de Wetering1, J. Cowley1, E. Archer1, N. Bourgeois2, L. Corner3, D. R. Emerson4, L. Feder1, X. J. Gu4, O. Jakobsson1,*, H. Jones3,†, A. Picksley1,‡, L. Reid3, W. Wang1, R. Walczak1,5, and S. M. Hooker1,§

    • 1John Adams Institute for Accelerator Science and Department of Physics, University of Oxford, Denys Wilkinson Building, Keble Road, Oxford OX1 3RH, United Kingdom
    • 2Central Laser Facility, STFC Rutherford Appleton Laboratory, Didcot OX11 0QX, United Kingdom
    • 3Cockcroft Institute for Accelerator Science and Technology, School of Engineering, The Quadrangle, University of Liverpool, Brownlow Hill, Liverpool L69 3GH, United Kingdom
    • 4Scientific Computing Department, STFC Daresbury Laboratory, Warrington WA4 4AD, United Kingdom
    • 5Somerville College, Woodstock Road, Oxford OX2 6HD, United Kingdom

    • *Deceased
    • †Now at Deutsches Elektronen-Synchrotron DESY, Notkestr. 85, 22607 Hamburg, Germany
    • ‡Now at Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
    • §simon.hooker@physics.ox.ac.uk

    Article Text

    Click to Expand

    Supplemental Material

    Click to Expand

    References

    Click to Expand
    Issue

    Vol. 6, Iss. 2 — April - June 2024

    Subject Areas
    Reuse & Permissions
    Author publication services for translation and copyediting assistance advertisement

    Authorization Required

    Log In
    Other Options
    ×

    Images

    • Figure 1
      Figure 1

      Sketch of the experimental layout. (a) Illustration of the pulse train generation scheme. (b) Example single-shot autocorrelator (SSA) measurement for the τ=(170±2)fs pulse train. Upper: comparison between the measured (pink) and retrieved (gray, dashed) SSA signal. Lower: retrieved pulse train intensity profile. (c) Measured axicon focus. (d) Example input mode of the focused multipulse drive beam. (e) Example guided mode at the channel exit. All focal spot images are normalized to their maximum. (f) Comparison between the measured and simulated longitudinal gas pressure profile [23].

      Reuse & Permissions
    • Figure 2
      Figure 2

      Comparison of the photon-normalized spectra, S̃(λ), of the input pulses (gray) and those transmitted through a 110mm-long HOFI channel for (a) a pulse train with τ=170fs and Etrain=(2.5±0.5)J; (b) an unmodulated pulse with FWHM duration ∼1ps and E=(2.7±0.5)J. S̃(λ) is shown near the resonance condition of the pulse train [blue; ne,res=(4.3±0.3)×1017cm−3] and for an off-resonant density [green, dashed; ne,0=(1.4±0.3)×1017cm−3]. The photon-normalized spectra have been scaled to a maximum value of unity for the input pulse.

      Reuse & Permissions
    • Figure 3
      Figure 3

      Density dependence of S̃(λ) for: (a), (b) a pulse train with τ=170fs, Etrain=(2.5±0.5)J; and (c), (d) an unmodulated ∼1ps, (2.7±0.5)J pulse. (a) and (c): S̃(λ), averaged in electron density bins of width Δne,0=0.24×1017cm−3. (b) and (d): mean values of R [black squares] weighted by energy transmission; red circles indicate bins containing data from only a single shot. The ne,0-error bars are a combination of the uncertainties in the measured pressure and the on-axis density calibration. The R-error bars represent the standard error on the mean. In (b), individual data points are plotted (gray circles) and the orange dotted line represents ne,res(τ=170fs). Overlaid are the results of the fluid calculations for Etrain=2.5J (green) and Etrain=0.8J (blue).

      Reuse & Permissions
    • Figure 4
      Figure 4

      Variation of R with on-axis density for a plasma channel of length L=70mm and for pulse trains of energy (2.7±0.5)J and pulse separation: (a) τ=200fs and (b) τ=170fs. The results of the fluid calculations, assuming Etrain=800mJ, are shown by the blue dashed lines. For each plot the expected resonant density is indicated by the orange dotted line.

      Reuse & Permissions
    ×

    Sign up to receive regular email alerts from Physical Review Research

    Reuse & Permissions

    It is not necessary to obtain permission to reuse this article or its components as it is available under the terms of the Creative Commons Attribution 4.0 International license. This license permits unrestricted use, distribution, and reproduction in any medium, provided attribution to the author(s) and the published article's title, journal citation, and DOI are maintained. Please note that some figures may have been included with permission from other third parties. It is your responsibility to obtain the proper permission from the rights holder directly for these figures.

    ×

    Log In

    Cancel
    ×

    Search

    Article Lookup

    Paste a citation or DOI
    Enter a citation
    ×