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Highly intensified emission of laser-accelerated electrons from a foil target through an additional rear laser plasma

Shunsuke Inoue, Yoshihide Nakamiya, Kensuke Teramoto, Masaki Hashida, and Shuji Sakabe
Phys. Rev. Accel. Beams 21, 041302 – Published 12 April 2018
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    Abstract

    Intensification of electrons escaping from an intense laser-produced plasma is demonstrated by using double femtosecond laser pulses. The electron density distribution at the rear surface of a laser-irradiated foil target is controlled by preirradiation to suppress sheath field growth and to expand the plasma into which the fast electrons are released. Consequently, the number of electrons escaping from the plasma that have an energy of 380 keV increases by a factor of 7. The experimental results are well explained by numerical simulations of a foil plasma with a preformed plasma and analytical evaluations considering the plasma expansion.

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    • Received 16 May 2016

    DOI:https://doi.org/10.1103/PhysRevAccelBeams.21.041302

    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
    Laser driven electron accelerationPlasma acceleration & new acceleration techniques
    Accelerators & Beams

    Authors & Affiliations

    Shunsuke Inoue*, Yoshihide Nakamiya, Kensuke Teramoto, Masaki Hashida, and Shuji Sakabe

    • Advanced Research Center for Beam Science, Institute for Chemical Research, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan and Department of Physics, Graduate School of Science, Kyoto University, Kitashirakawa, Sakyo, Kyoto 606-8502, Japan

    • *Corresponding author.

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    Issue

    Vol. 21, Iss. 4 — April 2018

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    Images

    • Figure 1
      Figure 1

      Schematic of the experimental setup. Two laser pulses (CPA1 and CPA2) are focused on the Al target (thickness: 11  μm).

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    • Figure 2
      Figure 2

      Dependence of the electron energy spectrum on time delay. Spectra are obtained by averaging 100 shots. The energy spectrum without the CPA2 pulse is almost the same as those for positive time delay. The inset shows the time-delay dependence of the amount of electron energy as measured by the magnetic spectrometer. The deviation of the electron energy is about 20%.

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    • Figure 3
      Figure 3

      (a) Images of the electron sources at time delays of −540, −340, −140, 0, and 60 ps. (b) Dependence of electron beam intensity on time delay. Error bars represent standard deviations. Dashed arrows show the results obtained by irradiation with the CPA1 pulse alone.

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    • Figure 4
      Figure 4

      Evolution of electron density distribution (solid lines). The inset shows an expansion of the scale length versus time obtained by fitting the electron density distribution for various time delays. Dashed lines show the electron density distributions with scale lengths of 0, 2.5, and 5  μm used for the 2D PIC simulations.

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    • Figure 5
      Figure 5

      PIC simulation results for the distribution of the electric field (Ex) and cross section of the electron density distributions at y=0, for (a) L=0  μm and (b) L=5  μm at the time when the electrons passed the plasma boundary. Dashed lines show the boundaries of the plasma for t=0. (c) Energy spectrum of the escaping electrons at x=60  μm and −60  μm<y<60  μm.

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    • Figure 6
      Figure 6

      Fraction of escaping electrons as a function of initial plasma radius obtained from the model calculation (solid line) and as a function of scale length (circles). The deviations of the fractions calculated from Fig. 2 are about 20%.

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