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Fast ion acceleration in ultraintense laser interactions with an overdense plasma

H. Habara1,*, R. Kodama1, Y. Sentoku1, N. Izumi1,†, Y. Kitagawa1, K. A. Tanaka1,2, K. Mima1, and T. Yamanaka1

  • 1Institute of Laser Engineering, Osaka University, Suita, 565-0871 Osaka, Japan
  • 2Faculty of Engineering, Osaka University, Suita, 565-0871 Osaka, Japan

  • *Present address: Central Laser Facility, Rutherford Appleton Laboratory, Chilton, Didcot, Oxfordshire OX11 0QX, UK.
  • Present address: Lawrence Livermore National Laboratory, P. O. Box 808, 7000 East Avenue, L-399 Livermore, CA 94550, USA.

Phys. Rev. E 69, 036407 – Published 24 March, 2004

DOI: https://doi.org/10.1103/PhysRevE.69.036407

Abstract

In order to study the ion acceleration processes in ultraintense laser-plasma interactions with solid targets, neutron spectra from deuteron-deuteron (D-D) nuclear reactions were measured. Spectra were obtained when (50–100 TW, 0.5–1 ps) laser light irradiated obliquely incident deuterated plastic targets as a function of laser polarization, intensity, and density scale length of the preformed plasma. The experimental data are compared with three-dimensional Monte Carlo simulations. The results indicate that the ion momentum distribution is collimated and directed into the bulk of the target to the target normal direction with an energy that is linearly proportional to the laser intensity. The distribution of the accelerated ions was observed to change from isotropic to anisotropic with laser prepulse intensity. All the results indicate that the ion acceleration is dominated by an electrostatic field generated from a charge displacement of the hot electrons at the target surface.

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