Efficient beta / gamma Monte Carlo transport in repetitive structures

Abstract

A bstract Algorithms are developed that permit the use of periodic and albedo boundary conditions in the ITS system of coupled electrodphoton Monte Carlo transport codes when simulating transport in repetitive structures in satellite systems. Mutual verification is provided through the application of both algorithms to a simplified periodic geometry based on an array of microelectronics cards. The albedo algorithm is then employed to benchmark the predictions of energy deposition in silicon by a mass sectoring code for this same application and to predict the shielding effectiveness of a hexagonal honeycomb structure. Use of these algorithms results in a major reduction in the required problem input and significant variance reduction that could otherwise be achieved only via postprocessing that is much more problem dependent.