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X-ray emission by the rear side of laser-irradiated gold targets

Published online by Cambridge University Press:  09 March 2009

D. Babonneau ,
J. L. Bocher ,
C. Bayer ,
A. Decoster ,
D. Juraszek ,
J. P. Perrine  and
G. Thiell
D. Babonneau
Affiliation:
Commissariat à l'Energie Atomique, Centre d'Etudes de Limeil-Valenton, 94195 Villeneuve Saint-Georges Cedex, France
J. L. Bocher
Affiliation:
Commissariat à l'Energie Atomique, Centre d'Etudes de Limeil-Valenton, 94195 Villeneuve Saint-Georges Cedex, France
C. Bayer
Affiliation:
Commissariat à l'Energie Atomique, Centre d'Etudes de Limeil-Valenton, 94195 Villeneuve Saint-Georges Cedex, France
A. Decoster
Affiliation:
Commissariat à l'Energie Atomique, Centre d'Etudes de Limeil-Valenton, 94195 Villeneuve Saint-Georges Cedex, France
D. Juraszek
Affiliation:
Commissariat à l'Energie Atomique, Centre d'Etudes de Limeil-Valenton, 94195 Villeneuve Saint-Georges Cedex, France
J. P. Perrine
Affiliation:
Commissariat à l'Energie Atomique, Centre d'Etudes de Limeil-Valenton, 94195 Villeneuve Saint-Georges Cedex, France
G. Thiell
Affiliation:
Commissariat à l'Energie Atomique, Centre d'Etudes de Limeil-Valenton, 94195 Villeneuve Saint-Georges Cedex, France
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Abstract

We present results of X-ray emission by the rear side of gold thin targets irradiated by the Phebus laser at λ = 0.35 μm, τ = 0.7 and 1.3 ns, and EL = 1.5 kJ. A streak camera coupled with a transmission grating gave the time-resolved X-ray emission of the rear side. Also, a streak camera coupled with a slit allowed us to obtain information about the space and time evolution of the plasma. Some other diagnostics gave information about the energy balance and the X-ray conversion efficiency. The results are in good agreement with previous ones obtained with the Octal laser, particularly on optimum thicknesses for X-ray conversion efficiencies. Values of the thermal flux limiter are deduced. Simulations with FCI 1 code with multigroup radiative transfer and non-LTE ionization reproduce the experimental results only about some points. A number of reasons, such as 2-D effects and problems of opacity, are invoked.

Type
Research Article
Information
Laser and Particle Beams , Volume 9 , Issue 2 , June 1991 , pp. 527 - 540
Copyright
Copyright © Cambridge University Press 1991

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References

REFERENCES

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