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Transient Thermo-mechanical Behavior of a Direct-drive Target During Injection in an Inertial Fusion Energy Chamber by Kurt-J. Boehm; A. René Raffray is a Engineering article available to read on EtoBox.

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During injection in an inertial fusion energy (IFE) chamber, a direct-drive target is subject to heat loads from chamber wall radiation and energy exchange from the chamber gas constituents. These heat loads can lead to the deuterium-tritium (DT) reaching its triple point temperature and even undergoing phase change, leading to unacceptable non-uniformity based on target physics requirements for compression and ignition of the DT fuel pellets using multiple laser beams. A two-dimensional bubble nucleation mode was added to the previously presented thermo-mechanical model to help better define the design margin for direct-drive IFE targets. The new model was validated by comparison with analytical results for controlled cases. It was then used to simulate heating experiments on DT targets conducted at the Los Alamos National Laboratory (LANL), where the 3 He present in the DT due to tritium decay was found to affect the nucleation process. The previous requirement for target survival was for the temperature of the DT to remain below triple point of DT (19.79 K). If the existence of a melt layer does not violate the symmetry requirements on the target for successful implosion, the co

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Author

Kurt-J. Boehm; A. René Raffray

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0920-3796)

Published

2007

Language

EN

Field

Engineering (Physical Sciences)