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A technique to study Rayleigh–Taylor instability by α-particle backlighting

Published online by Cambridge University Press:  09 March 2009

A. P. Fews ,
M. Savage  and
M. J. Lamb
A. P. Fews
Affiliation:
H. H. Wills Physics Laboratory, University of Bristol, Bristol BS8 1TL, UK
M. Savage
Affiliation:
H. H. Wills Physics Laboratory, University of Bristol, Bristol BS8 1TL, UK
M. J. Lamb
Affiliation:
Department of Pure and Applied Physics, Queens University Belfast, Belfast, BT7 INN, UK
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Abstract

A novel α-particle backlighting technique has been developed to diagnose laser plasmas, enabling small changes in the thickness modulation to be measured, down to ~0.1 μm. In this technique, a laser-driven implosion of a D–T target produces a bright pulse of α-particles that is used to shadow a separately driven foil. Each α-particle loses range in the foil, and each such measurement forms an individual local determination of the foil thickness at the time of passage of the particles. A shadow image of the driven foil can also be produced, of spatial resolution limited by source size and multiple Coulomb scattering in the driven plasma. The technique is illustrated here with a preliminary study of fluid instabilities in laser-accelerated planar foils. Foils were accelerated using both unsmoothed and smoothed laser drive beams. Foils driven by beams smoothed by random-phase plates showed a much reduced modulation.

Type
Research Article
Information
Laser and Particle Beams , Volume 11 , Issue 1 , March 1993 , pp. 257 - 268
Copyright
Copyright © Cambridge University Press 1993

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References

REFERENCES

Coe, S.E. et al. 1989 Central Laser Facility Annual Report, Rutherford Appleton Laboratory Report RAL–89–045, p. 51.Google Scholar
Danson, C.N. et al. 1989 Central Laser Facility Annual Report, Rutherford Appleton Laboratory Report RAL–89–045, p. 141.Google Scholar
Desselberger, M. et al. 1990 Phys. Rev. Lett. 65, 2997.CrossRefGoogle Scholar
Emery, M.H. et al. 1986 Phys. Rev. Lett. 57, 703.CrossRefGoogle Scholar
Emery, M.H. et al. 1988 Phys. Fluids 31, 1005.CrossRefGoogle Scholar
Fews, A.P. 1992a Nucl. Instrum. Meth. B B71, 465.CrossRefGoogle Scholar
Fews, A.P. 1992b Nucl. Instrum. Meth. B B72, 91.CrossRefGoogle Scholar
Fews, A.P. & Henshaw, D.L. 1982 Nucl. Instrum. Meth. 197, 517.CrossRefGoogle Scholar
Fews, A.P. et al. 1990 Central Laser Facility Annual Report, Rutherford Appleton Laboratory Report RAL–90–026, pp. 31, 33, and 36.Google Scholar
Fews, A.P. et al. 1992 Opt. Comm. 94, 259.CrossRefGoogle Scholar
Grun, J. et al. 1987 Phys. Rev. Lett. 58, 2672.CrossRefGoogle Scholar
Key, M.H. et al. 1989 Opt. Comm. 71, 184.CrossRefGoogle Scholar
Kilkenny, J.D. 1990 Phys. Fluids B, 2, 1400.CrossRefGoogle Scholar
Remington, B.A. et al. 1991 Phys. Rev. Lett. 67, 3259.CrossRefGoogle Scholar
Takabe, H. et al. 1985 Phys. Fluids 28, 3676.CrossRefGoogle Scholar