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1. I need to be efficient
The iterations are needed because I do not know q
scat
within the energy group
i.e. scattering events with minimal energy transfer
When do I expect delays in convergence?
Multiple scattering with minimal energy
transfer that occurs in the
192
Ir energy range
as well as
coherent scattering that is significant at low
energies and high Z materials,
delay convergence
Algorithms to force convergence are used
(DSA-Diffusion synthetic acceleration)