Adaptive tree multigrids and simplified spherical harmonics approximation in deterministic neutral and charged particle transport
By: Petri Kotiluoto.
Contributors: Valtion teknillinen tutkimuskeskus.
Series: VTT publications -- 639.; VTT julkaisuja -- 639.
Publisher: VTT Technical Research Centre of Finland
Published: 2007
Place of publication: [Espoo, Finland]
Language: eng
ISBN-13: 9789513870164
Subjects: Spherical harmonics.; Transport theory.; Neutrons -- Capture.
Description: A new deterministic three-dimensional neutral and charged particle transport code, MultiTrans, has been developed. In the novel approach, the adaptive tree multigrid technique is used in conjunction with simplified spherical harmonics approximation of the Boltzmann transport equation.  The development of the new radiation transport code started in the framework of the Finnish boron neutron capture therapy (BNCT) project. Since the application of the MultiTrans code to BNCT dose planning problems, the testing and development of the MultiTrans code has continued in conventional radiotherapy and reactor physics applications.  In this thesis, an overview of different numerical radiation transport methods is first given. Special features of the simplified spherical harmonics method and the adaptive tree multigrid technique are then reviewed. The usefulness of the new MultiTrans code has been indicated by verifying and validating the code performance for different types of neutral and charged particle transport problems, reported in separate publications.
Notes: Thesis (doctoral)--University of Helsinki, 2007.

Includes bibliographical references.

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