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Radiation driven planar foil instability and mix experiments at the AWE HELEN laser*

Published online by Cambridge University Press:  09 March 2009

J. C. V. Hansom ,
P. A. Rosen ,
T. J. Goldack ,
K. Oades ,
P. Fieldhouse ,
N. Cowperthwaite ,
D. L. Youngs ,
N. Mawhinney  and
A. J. Baxter
J. C. V. Hansom
Affiliation:
Atomic Weapons Establishment, Aldermaston, Reading, RG7 4PR, England
P. A. Rosen
Affiliation:
Atomic Weapons Establishment, Aldermaston, Reading, RG7 4PR, England
T. J. Goldack
Affiliation:
Atomic Weapons Establishment, Aldermaston, Reading, RG7 4PR, England
K. Oades
Affiliation:
Atomic Weapons Establishment, Aldermaston, Reading, RG7 4PR, England
P. Fieldhouse
Affiliation:
Atomic Weapons Establishment, Aldermaston, Reading, RG7 4PR, England
N. Cowperthwaite
Affiliation:
Atomic Weapons Establishment, Aldermaston, Reading, RG7 4PR, England
D. L. Youngs
Affiliation:
Atomic Weapons Establishment, Aldermaston, Reading, RG7 4PR, England
N. Mawhinney
Affiliation:
Atomic Weapons Establishment, Aldermaston, Reading, RG7 4PR, England
A. J. Baxter
Affiliation:
Atomic Weapons Establishment, Aldermaston, Reading, RG7 4PR, England
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Abstract

This paper reviews recent developments and achievements in the program of planar foil instability experiments being performed at the AWE HELEN laser. Point projection Xray backlighting, with spectroscopy, is used to measure hydrodynamic mix in radiatively accelerated ablator/foil packages; the mix is identified in the experimental radiograph from the overlap of distinguishable spectral absorption features associated with each of the constituent materials.

The first part of the paper describes the backlighting technique, and briefly summarizes progress made in the past two years, leading to the first results being obtained on a “high mix” Parylene-C ablator/molybdenum payload package. The second part considers the full analysis of one such ‘high mix’ shot (Shot 7772), describing how the spatial distribution of mix has been quantified and considering the various sources of error. Comparisons are made with both one-dimensional and two-dimensional hydrocode simulations. Finally, various improvements and extensions to the experiment and codes are indicated.

Type
Research Article
Information
Laser and Particle Beams , Volume 8 , Issue 1-2 , January 1990 , pp. 51 - 71
Copyright
Copyright © Cambridge University Press 1990

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References

Burrows, K. D., Smeeton, V. S. & Youngs, D. L. 1984 AWRE 022/84.Google Scholar
Chandrasekhar, S. 1968 Hydrodynamics and Hydromagnetic Stability (Oxford University Press) 435.Google Scholar
Foster, J. M. et al. 1988 Proceedings of 7th APS Topical Conference on High Temperature Plasma Diagnostics,Napa, California, March.Google Scholar
Grant, I. P. et al. 1980 Computer Physics Communications 21, 204.CrossRefGoogle Scholar
Kilkenny, J. D. et al. 1988 Presented at the APS Meeting (Plasma Physics Division), Hollywood, Florida 31 Oct.-4 Nov. 1988, to be published in Phys. Rev. L.Google Scholar
Layzer, D. 1955 Astrophysical J. 122, 1.CrossRefGoogle Scholar
Mikaelian, K. O. 1985 UCRL-93499.Google Scholar
Mikaelian, K. O. 1986 UCRL-93977.Google Scholar
Mikaelian, K. O. 1986a UCRL-95582.Google Scholar
Read, K. I. 1984 Physica 12D, 45.Google Scholar
Richtmyer, R. D. 1960 Com. in Pure and Appl. Math. 13, 297.CrossRefGoogle Scholar
Roberts, P. D. 1980 Unpublished AWRE report.Google Scholar
Smeeton, V. S. & Youngs, D. L. 1988 AWRE 035/87.CrossRefGoogle Scholar
Smith, C. C. & Rose, S. 1988 Private communication.Google Scholar
Thomas, B. R. et al. 1988 Unpublished AWE report.Google Scholar
Youngs, D. L. 1984 Physica 12D, 32.Google Scholar
Youngs, D. L. 1988 Paper given at Advances in Fluid Turbulence Conference,Los Alamos, May, submitted to Physica D.Google Scholar
Youngs, D. L. 1988a Proceedings of the Workshop on Compressible Turbulent Mixing,Princeton, October 1988, to be published.Google Scholar