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Hot spot heating process estimate using a laser-accelerated quasi-Maxwellian deuteron beam

Published online by Cambridge University Press:  13 December 2011

Xiaoling Yang*
Affiliation:
Department of Nuclear, Plasma and Radiological Engineering, University of Illinois, Urbana, Illinois
George H. Miley
Affiliation:
Department of Nuclear, Plasma and Radiological Engineering, University of Illinois, Urbana, Illinois
Kirk A. Flippo
Affiliation:
P-24 Plasma Physics, Los Alamos National Laboratory, Los Alamos, New Mexico
Heinrich Hora
Affiliation:
The University of New South Wales, Sydney, Australia
*
Address correspondence and reprint requests to: Xiaoling Yang, Department of Nuclear, Plasma and Radiological Engineering, University of Illinois, Urbana, IL 61801. E-mail: [email protected]

Abstract

The hot spot heating process by an assumed deuteron beam is evaluated in order to estimate the contribution of the energy produced by the deuteron beam-target fusion to the heating process. The deuteron beam energy versus the number of deuterons is evaluated through the experimentally achieved proton beam energy distribution using the TRIDENT short pulse laser at the Los Alamos National Laboratory (LANL). The corresponding hot spot heating is then calculated using this assumed deuteron beam spectrum. The resulting first order heating dynamics is employed in the expanded “bonus” energy calculation, and a 12.73% extra energy from deuteron beam-target fusion was found with the assumed deuteron spectrum when ρrb = 4.5 g/cm2 is considered, where ρ is the fuel density, and rb is the ion beam focusing radius on the target. The results provide further insight into the contribution of the extra heat produced by deuteron beam-target fusion to the hot spot ignition process. A further analysis of how a converter foil using ultra-high-density cluster materials can help to achieve the yield requirements for ignition is presented.

Type
Research Article
Copyright
Copyright © Cambridge University Press 2011

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