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Acceleration phase and improved rocket model for indirectly driven capsules

Published online by Cambridge University Press:  01 October 2004

YVES SAILLARD
YVES SAILLARD
Affiliation:
CEA-DAM Ile de France
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Abstract

The system of differential equations for the non-ablated mass, the average implosion velocity, and the ablation radius of an indirectly driven capsule in acceleration phase, has been obtained from conservation principles of hydrodynamics. Two phases are distinguished during acceleration, according to the uniformity of the velocity in the non-ablated shell. The results of the integration of this system are well compared with numerical simulation of optimized capsules. Assuming that the ablation pressure depends only on the Hohlraum temperature, the relations between the non-ablated mass, the implosion velocity, and the ablation radius are obtained for optimized temperature shape. These relations provide the maximum implosion velocity and the remaining non-ablated mass in terms of the initial capsule and the maximum temperature (or the initial capsule mass in terms of the remaining non-ablated mass) useful to determine the required ablator thickness for optimized capsules. These results are also compared with numerical simulations of different capsules.

Keywords

AblationAcceleration phaseICF capsuleImplosionImplosion velocity
Type
Research Article
Information
Laser and Particle Beams , Volume 22 , Issue 4 , October 2004 , pp. 451 - 459
Copyright
© 2004 Cambridge University Press

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References

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