Theory and generation methods for N-ary stochastic mixtures with Markovian mixing statistics
Abstract not provided.
Publications
SCEPTRE 2.3 Quick Start Guide
This report provides a summary of notes for building and running the Sandia Computational Engine for Particle Transport for Radiation Effects (SCEPTRE) code. SCEPTRE is a general- purpose C++ code for solving the linear Boltzmann transport equation in serial or parallel using unstructured spatial finite elements, multigroup energy treatment, and a variety of angular treatments including discrete ordinates (Sn) and spherical harmonics (Pn). Either the first-order form of the Boltzmann equation or one of the second-order forms may be solved. SCEPTRE requires a small number of open-source Third Party Libraries (TPL) to be available, and example scripts for building these TPL are provided. The TPL needed by SCEPTRE are Trilinos, Boost, and Netcdf. SCEPTRE uses an autotools build system, and a sample configure script is provided. Running the SCEPTRE code requires that the user provide a spatial finite-elements mesh in Exodus format and a cross section library in a format that will be described. SCEPTRE uses an xml-based input, and several examples will be provided.
Algorithms and Applications of the SCEPTRE Radiation Transport Code
Abstract not provided.
SCEPTRE 2.2 Quick Start Guide
This report provides a summary of notes for building and running the Sandia Computational Engine for Particle Transport for Radiation Effects (SCEPTRE) code. SCEPTRE is a general- purpose C++ code for solving the li near Boltzmann transport equation in serial or parallel using unstructured spatial finite elements, multigroup energy treatment, and a variety of angular treatments including discrete ordinates and spherical harmonics. Either the first-order form of the Boltzmann equation or one of the second-order forms may be solved. SCEPTRE requires a small number of open-source Third Part y Libraries (TPL) to be available, and example scripts for building these TPLs are provided. The TPLs needed by SCEPTRE are Trilinos, boost, and netcdf. SCEPTRE uses an autotools build system , and a sample configure script is provided. Running the SCEPTRE code requires that the user provide a spatial finite-elements mesh in Exodus format and a cross section library in a format that will be described. SCEPTRE uses an xml-based input, and several examples will be provided.
SCEPTRE 2.2 Angular Quadrature Sets
This document includes details of the angular quadrature sets available in SCEPTRE for performing numerical integrations in the angular phase space. The angular dependence of the boundary and fixed-source terms an d initial angular flux are specified by angular index rather than by direction. It is, therefore, necessary to know the mapping from a specific direction to a direction index. This document includes angular quadrature weights and direction cosines for most of the quadrature sets available in SCEPTRE.
Theory and generation methods for N-ary stochastic mixtures with Markovian mixing statistics
Abstract not provided.
Verification of Deterministic Radiation Transport Codes
Abstract not provided.
Adjoint-Based UQ and Optimization Under Uncertainty for Satellite Shield Designs
Abstract not provided.
Adjoint-Based UQ And Optimization Under Uncertainty For Satellite Shield Designs
Abstract not provided.
Verification Of Deterministic Radiation Transport Codes
Abstract not provided.
Specializations in the SCEPTRE Code for Charged-Particle Transport
Abstract not provided.
Adjoint-enabled Robust Radiation Shield Design
Abstract not provided.
GEOMETRIC UNCERTAINTY QUANTIFICATION AND ROBUST DESIGN FOR 2D SATELLITE SHIELDING
Abstract not provided.
Adjoint-Enabled Multidimensional Optimization of Satellite Radiation Shields
Abstract not provided.
Design Optimization of Satellite Electron/Proton Shields
Abstract not provided.
Design Optimization of Satellite Electron/Proton Shields
Abstract not provided.
Geometric uncertainty quantification and robust design for 2D satellite shielding
International Conference on Mathematics and Computational Methods Applied to Nuclear Science and Engineering, M and C 2019
The design of satellites usually includes the objective of minimizing mass due to high launch costs, which is challenging due to the need to protect sensitive electronics from the space radiation environment by means of radiation shielding. This is further complicated by the need to account for uncertainties, e.g. in manufacturing. There is growing interest in automated design optimization and uncertainty quantification (UQ) techniques to help achieve that objective. Traditional optimization and UQ approaches that rely exclusively on response functions (e.g. dose calculations) can be quite expensive when applied to transport problems. Previously we showed how adjoint-based transport sensitivities used in conjunction with gradient-based optimization algorithms can be quite effective in designing mass-efficient electron and/or proton shields in one- or two-dimensional Cartesian geometries. In this paper we extend that work to UQ and to robust design (i.e. optimization that considers uncertainties) in 2D. This consists primarily of using the sensitivities to geometric changes, originally derived for optimization, within relevant algorithms for UQ and robust design. We perform UQ analyses on previous optimized designs given some assumed manufacturing uncertainties. We also conduct a new optimization exercise that accounts for the same uncertainties. Our results show much improved computational efficiencies over previous approaches.
Adjoint-enabled multidimensional optimization of satellite radiation shields
Transactions of the American Nuclear Society
Abstract not provided.
SCEPTRE - Sandia Computational Engine for Particle Transport for Radiation Effects
Abstract not provided.
SCEPTRE 2.0 Quick Start Guide
This report provides a summary of notes for building and running the Sandia Computational Engine for Particle Transport for Radiation Effects (SCEPTRE) code. SCEPTRE is a general purpose C++ code for solving the Boltzmann transport equation in serial or parallel using unstructured spatial finite elements, multigroup energy treatment, and a variety of angular treatments including discrete ordinates and spherical harmonics. Either the first-order form of the Boltzmann equation or one of the second-order forms may be solved. SCEPTRE requires a small number of open-source Third Party Libraries (TPL) to be available, and example scripts for building these TPL's are provided. The TPL's needed by SCEPTRE are Trilinos, boost, and netcdf. SCEPTRE uses an autoconf build system, and a sample configure script is provided. Running the SCEPTRE code requires that the user provide a spatial finite-elements mesh in Exodus format and a cross section library in a format that will be described. SCEPTRE uses an xml-based input, and several examples will be provided. 5 6
SCEPTRE Training
Abstract not provided.
Adjoint-enabled Multidimensional Optimization of Satellite Electron/Proton Shields
Abstract not provided.
ADJOINT-ENABLED MULTIDIMENSIONAL OPTIMIZATION OF SATELLITE ELECTRON/PROTON SHIELDS
Abstract not provided.
SPECIALIZATIONS IN THE SCEPTRE CODE FOR CHARGED-PARTICLE TRANSPORT
Abstract not provided.
Specializations in the SCEPTRE Code for Charged-Particle Transport
Abstract not provided.
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