Improved algorithms and advanced features of the CAD to MC conversion tool McCad

• The latest improvements of the McCad conversion approach including decomposition and void filling algorithms is presented.
• An advanced interface for the materials editing and assignment has been developed and added to the McCAD GUI.
• These improvements have been tested and successfully applied to DEMO and ITER NBI (Neutral Beam Injector) applications.
• The performance of the CAD model conversion process is shown to be significantly improved.

McCad is a geometry conversion tool developed at KIT to enable the automatic bi-directional conversions of CAD models into the Monte Carlo (MC) geometries utilized for neutronics calculations (CAD to MC) and, reversed (MC to CAD), for visualization purposes. The paper presents the latest improvements of the conversion algorithms including improved decomposition, void filling and an advanced interface for the materials editing and assignment. The new implementations and features were tested on fusion neutronics applications to the DEMO and ITER NBI (Neutral Beam Injector) models. The results demonstrate greater stability and enhanced efficiency of McCad conversion process.