Hostname: page-component-78c5997874-8bhkd Total loading time: 0 Render date: 2024-11-04T18:43:48.504Z Has data issue: false hasContentIssue false
  • English
  • Français

Theory of efficient shell implosions

Published online by Cambridge University Press:  09 March 2009

Masakatsu Murakami ,
Katsunobu Nishihara  and
Hideaki Takabe
Masakatsu Murakami
Affiliation:
Institute of Laser Engineering, Osaka University 2–6, Yamada-oka, Suita, Osaka, 565, Japan
Katsunobu Nishihara
Affiliation:
Institute of Laser Engineering, Osaka University 2–6, Yamada-oka, Suita, Osaka, 565, Japan
Hideaki Takabe
Affiliation:
Institute of Laser Engineering, Osaka University 2–6, Yamada-oka, Suita, Osaka, 565, Japan
Get access Rights & Permissions [Opens in a new window]

Abstract

A theoretical model of spherical ablative implosion is presented. The implosion performances such as the target coupling efficiency are estimated from the aspect ratio and initial mass density of a target shell, provided the laser is fixed at moderate intensity for a given wavelength. The model is applied to the experimental results obtained for both plastic hollow shell targets and DT gas-filled GMB targets by use of the twelve-beam green GEKKO XII laser. In addition to the target coupling efficiency, it is shown for the gas-filled targets that the theoretical predictions of neutron yield, ion temperature, and fuel ρ and ρR are in good agreement with the experimental results. Reduction of neutron yields due to irradiation nonuniformity is also discussed, and 5% of absorption nonuniformity is found to be required for explaining the discrepancies in neutron yield between the experiments and the theory.

Type
Research Article
Information
Laser and Particle Beams , Volume 7 , Issue 2 , May 1989 , pp. 189 - 205
Copyright
Copyright © Cambridge University Press 1989

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Ahlborn, et al. 1982 Phys. Fluids 25, 541.CrossRefGoogle Scholar
Azechi, H. et al. 1987 Phys. Rev. Lett. 59, 2635.CrossRefGoogle Scholar
Decoste, R. et al. 1979 Phys. Rev. Lett. 42, 1673.Google Scholar
Fabbro, R. et al. 1985 Phys. Fluids 28, 1463.CrossRefGoogle Scholar
Felber, F. S. 1978 Phys. Rev. Lett. 39, 84.CrossRefGoogle Scholar
Gardner, J. H. & Bodner, S. E. 1986 Phys. Fluids 29, 2672.Google Scholar
Hattori, F. et al. 1986 Phys. Fluids 29, 1719.CrossRefGoogle Scholar
Max, C. E. et al. 1983 Nucl. Fusion 23, 131.CrossRefGoogle Scholar
Mayer, F. J. et al. 1983 Phys. Fluids 26, 1673.Google Scholar
Mima, K. et al. 1983 ILE Quarterly Progress Report, Osaka Univ., ILE-QPR-83–7, p. 28.Google Scholar
Murakami, M. & Nishihara, K. 1987 Jpn. J. Appl. Phys. 26, 1132.CrossRefGoogle Scholar
Miyanaga, N. 1987 private communication.Google Scholar
Nakai, S. et al. 1988 ILE Quarterly Progress Report, Osaka Univ., ILE-QPR-88–25.Google Scholar
Nishihara, K. 1982 Jpn. J. Appl. Phys. 21, L571.Google Scholar
Nishimura, H. et al. 1986 Can. J. Phys. 64, 986.Google Scholar
Nishihara, K. et al. 1987 Proc. 8th International Workshop on Laser and Related Plasma Phenomena.Google Scholar
Takabe, H. et al. 1978 J. Phys. Soc. Jpn. 45, 2001.CrossRefGoogle Scholar
Takabe, H. et al. 1988 Phys. Fluids to be published.Google Scholar
Yabe, T. 1987 ILE Research Report, Osaka Univ., ILE8708P.Google Scholar
Yamanaka, C. et al. 1986 Nucl. Fusion 27, 19.CrossRefGoogle Scholar