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Adjoint-Based Uncertainty Analysis for Essential Reactions in a Laser Inertial Fusion Engine

Jeffrey E. Seifried, Massimiliano Fratoni, Kevin J. Kramer, Jeffery F. Latkowski, Per F. Peterson, Jeffrey J. Powers, Janine M. Taylor

Fusion Science and Technology / Volume 60 / Number 2 / August 2011 / Pages 692-697

Nuclear Analysis & Experiments / Proceedings of the Nineteenth Topical Meeting on the Technology of Fusion Energy (TOFE) (Part 2)

This study establishes a procedure for constructing explicit and adjoint-based implicit sensitivities with MCNP5. Using these methods, an instantaneous sensitivity-based uncertainty analysis is performed on the depleted uranium hybrid LIFE (Laser Inertial Fusion Energy) blanket. Explicit sensitivities and uncertainties are calculated for (n, 2n), tritium production, fission, and radiative capture reaction rates during the fuel lifecycle. Nuclear data uncertainties and Monte Carlo counting precision are compared in a convergence study and the compounding of the two is quantified to gauge the validity of the analysis. A multi-group cross-section library is generated for adjoint calculations and selected adjoint distributions are shown and discussed.

 
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