[Table of Contents]

Plasma and Fusion Research

Volume 9, 1404118 (2014)

Regular Articles

Energy Transportation by MeV Hot Electrons in Fast Ignition Plasma Driven with LFEX PW Laser
Zhe ZHANG, Hiroaki NISHIMURA, Shinsuke FUJIOKA, Yasunobu ARIKAWA, Mitsuo NAKAI, Hideo NAGATOMO, Hiroyuki SHIRAGA, Sadaoki KOJIMA, Alessio MORACE, Noriaki MIYANAGA, Junji KAWANAKA, Yoshiki NAKATA, Takahisa JITSUNO, Hiroshi AZECHI, Tetsuo OZAKI1), Hui CHEN2), Jaebum PARK2), Gerald Jackson WILLIAMS2), Tomoyuki JOHZAKI3) and Atsushi SUNAHARA4)
Institute of Laser Engineering, Osaka University, 2-6 Yamada-oka, Suita, Osaka 565-0871, Japan
1)
National Institute for Fusion Science, LHD, High Temperature Plasma G. 322-6 Oroshi Toki, Gifu 509-5292, Japan
2)
Lawrence Livermore National Laboratory, Livermore, CA 94550, USA
3)
The Graduate School of Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashi Hiroshima 739-8527, Japan
4)
Institute for Laser Technology, 2-6 Yamada-oka, Suita, Osaka 565-0871, Japan
(Received 24 January 2014 / Accepted 13 May 2014 / Published 29 July 2014)

Abstract

Implosion and heating experiments with the scheme of fast ignition (FI) have been performed on Gekko-XII and LFEX laser platform at the Institute of Laser Engineering in Osaka University. A cone-guided CD-shell has been used as a base-line target for the fast ignition realization. The information about energy transfer from LFEX petawatt (PW) laser is quantitatively studied with an absolute Kα diagnostics and a fast electron trajectory simulation. The transfer efficiency (ηTE) is estimated for a planar interaction as a reference and for several types of guiding-cone. As a general trend, the guiding-cone enhanced the ηTE by a factor of 3 comparing with the planar case.

Keywords

fast ignition, x-ray spectroscopy, laser transfer efficiency

DOI: 10.1585/pfr.9.1404118

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References

  • [1] R. Kodama et al., Nature 412, 6849 (2001).
  • [2] H. Shiraga, S. Fujioka, M. Nakai et al., Plasma Phys. Control. Fusion 53, 124029 (2011).
  • [3] Z. Zhang, H. Nishimura, T. Namimoto et al., Rev. Sci. Instrum. 83, 053502 (2012).
  • [4] Y. Cauchois, J. de Phys. et le Radium 3, 320 (1932).
  • [5] J.F. Seely, L.T. Hudson, G.E. Holland and A. Henins, Appl. Opt. 47, 2767 (2008).
  • [6] D. Salzmann, C. Reich, I. Uschmann, E. Förster and P. Gibbon, Phys. Rev. E 65, 036402 (2002).

This paper may be cited as follows:

Zhe ZHANG, Hiroaki NISHIMURA, Shinsuke FUJIOKA, Yasunobu ARIKAWA, Mitsuo NAKAI, Hideo NAGATOMO, Hiroyuki SHIRAGA, Sadaoki KOJIMA, Alessio MORACE, Noriaki MIYANAGA, Junji KAWANAKA, Yoshiki NAKATA, Takahisa JITSUNO, Hiroshi AZECHI, Tetsuo OZAKI, Hui CHEN, Jaebum PARK, Gerald Jackson WILLIAMS, Tomoyuki JOHZAKI and Atsushi SUNAHARA, Plasma Fusion Res. 9, 1404118 (2014).