MAVRIC - Control Module

The MAVRIC sequence (Monaco with Automated Variance Reduction using Importance Calculations) will perform radiation transport on problems that are too challenging for standard, unbiased Monte Carlo methods. The intention of the sequence is to calculate fluxes and dose rates with low uncertainties in reasonable times even for deep penetration problems. MAVRIC is based on the CADIS (Consistent Adjoint Driven Importance Sampling) methodology, which uses an importance map and biased source that are derived to work together. MAVRIC uses CSAS/ICE to generate cross sections for the materials input by the users. MAVRIC will then automatically perform a coarse mesh, three-dimensional, discrete ordinates calculation using Denovo to determine the adjoint flux as a function of position and energy. This adjoint flux information is then used by MAVRIC to construct a space and energy-dependent importance map (i.e., weight windows) to be used for biasing during particle transport and a mesh-based biased source distribution. MAVRIC then passes the importance map and biased source distribution to the functional module Monaco, a three-dimensional, fixed-source, multi-group shielding code. In addition to materials input, the user will also supply the geometry description using the SCALE General Geometry Package; source description as a function of position, energy and direction; tally descriptions (fluxes in which regions, at what point detectors, or over what mesh grids); response functions (function of energy); planes for the mesh used by Denovo; and which tally to use as the Denovo adjoint source. Output consists of tables detailing the region and point detector fluxes (and their responses), as well as files for mesh tallies.