Skip to main content Accessibility help

Analysis of target implosion on irradiation by proton beams I Beam interaction with target plasma

  • Moritake Tamba (a1), Norimasa Nagata (a2), Shigeo Kawata (a2) and Keishiro Niu (a2)


Numerical simulations and analyses are given for the implosion of a hollow shell target driven by proton beams. The target consists of three layers of Pb, Al and DT. The Pb and Al layers play roles of a tamper and a pusher, respectively. The main part of the beam energy is deposited in the Al layer. But the process of deposition depends strongly on the distribution of incident angles and particle energies. As the Al layer is heated by proton beams, the layer expands and pushes the DT layer toward the target centre. This type of implosion motion is examined by using a similarity solution for the slab model. To obtain an optimum velocity for the DT implosion, the optimum target size and optimum layer thicknesses are determined. The Rayleigh–Taylor instability, accompanied by the implosion motion is investigated, and the implosion is found to be stable with respect to the chosen target structure. The effects of inhomogeneities on implosion are shown to be severe. The initial fluctuation of the temperature or the density in the Al layer must be less than 3% and the maximum amplitude of the ripples on the initial boundary surface should be less than 3 μm with a view to achieving a high target gain.



Hide All
Abe, T. & Niu, K. 1981 Jap. J. Appl. Phys. 20, L91.
Boris, J. P. & Orens, J. H. 1978 Digest of Tech. Papers Presented at Topical Meeting on ICF, San Diego, Thcl-1.
Frank, R. M. & Lazarus, R. B. 1964 Methods in Computational Physics 3.
Hora, H. 1972 Laser Interaction and Related Plasma Phenomena, Schwarz, H. J. & Hora, H. editors (Plenum, New York) Vol 1, 365.
Livingston, M. S. & Bethe, H. A. 1937 Rev. Mod. Phys. 9, 263.
Nishiguch, A. & Yabe, T. 1981 Osaka Univ. Inst. Laser Eng. Rept. ILE8132p.
Nuckolls, J. H., Bangarter, R. O., Lindl, J. D., Mead, W. C. & Pan, Y. L. 1975 LLL preprint UCRL-79373.
Suzuki, Y. & Kawakita, K. 1982 Proceedings of Japan–U.S. Seminar on Theory and Applicatiorz of Multiply-Ionized Plasma Produced by Laser and Particle Beams, Nara.
Whaling, W. 1958 Handbuch der Phys. Bd XXXIV, 13.
Winterberg, F. 1968 Plasma Phys. 10, 55.
Yabe, T., Nishiguchi, A. & Ueda, N. 1981 Appl. Phys. Lett. 39, 222.
Young, F. C., Mosher, D., Stephanakis, S. J., Goldstein, S. A. & Mehlhorn, T. A. 1982 Phys. Rev. Lett. 49, 549.


Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed