Visualization of three-dimensional particle transport calculations with the use of generalized contributon theory

Generalized Contributon Theory has been implemented for three dimensional (x-y-z) cartesian geometry. The TORT 3D neutron/photon transport code is used for the calculation of the forward and adjoint directional fluxes and these are used for the generation of the contribution theory parameters. A new 3D contribution code has been developed for the generation of the contributon theory parameters. The new 3D contributon code is also capable of doing 2D calculations by using the data generated by the TORT code with its 2D calculational option.; The integral response calculations of the contributon code are verified by the integral response conservation theorem of spatial channel theory using a 3D, eight-group symmetric dipole problem. The slowing down theory calculations of the contributon code are also verified using the slowing down equation with the same 3D problem.; The spatial channel theory calculations are illustrated by a 3D, eight-group unsymmetrical dipole problem. This 3D geometry contains an irregular streaming gap and a shield region which is placed in front of the detector. The visualizations of the integral contributon flux show the important spatial regions of the response flow. The streamlines drawn by a quantitative streamline distribution technique reveals the spatial concentrations of the integral response flow. Quantitative streamline visualizations with three different 3D, eight-group unsymmetrical dipole problems very clearly show that the response flows through the least resistant regions of the medium. The volumetric color-contour visualizations of the response flow from different perspectives are also used to illustrate quantitatively the spatial response flow magnitude.; The energy dependent processes of the response flow are investigated by contributon slowing down theory. The same 3D, eight-group unsymmetrical dipole problem prepared for the spatial channel theory applications is used for the numerical interpretation of the slowing down theory calculations.; A dimensionless form of the response balance equation in terms of the slowing down flux and response current is used to illustrate the response flow in the complete space-lethargy phase space. The lethargy dependent variation of response flux is illustrated using color-contour visualizations of the slowing down flux in dimensionless 3D space-lethargy phase space. A fourdimensional response flow vector in dimensionless space-lethargy defined in terms of the response current and slowing down flux, is used for response flow illustrations.; The analysis and visualization techniques developed and illustrated in this work should be generally applicable to complex radiation shielding problems. These methods offer an alternative to current analysis techniques and they provide more insight and understanding of the problem under study. (Abstract shortened by UMI.)...