ITS - THE INTEGRATED TIGER SERIES OF ELECTRON PHOTON TRANSPORT CODES - VERSION 3.0

The ITS system is a powerful and user-friendly software package permitting state-of-the-art Monte Carlo solution of linear time-independent coupled electron/photon radiation transport problems, with or without the presence of macroscopic electric and magnetic fields of arbitrary spatial dependence. Version 3.0 is a major upgrade of the system with important improvements in the physical model, variance reduction, I/O, and user friendliness. Improvements to the cross-section generator include the replacement of Born-approximation bremsstrahlung cross sections with the results of numerical phase-shift calculations, the addition of coherent scattering and binding effects in incoherent scattering, an upgrade of collisional and radiative stopping powers, and a complete rewrite to Fortran 77 standards emphasizing Block-IF structure, Improvements in the Monte Carlo codes include significant variance reduction from reorganized logic for electron trapping and Russian Roulette, angular dependent output of particle fluxes, explicit line radiation in flux and escape outputs, an option for photon transport only, more accurate sampling of collision loss straggling, extended implementation of full automatic subzoning, increased error checking, and extensive improvements in code clarity and maintainability.