Attila4MC. Software for Simplifying Monte Carlo. For more info contact or

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1 Attila4MC Software for Simplifying Monte Carlo For more info contact or MCNP and MCNP6 are trademarks of Los Alamos National Security, LLC, Los Alamos National Laboratory. Attila is a Trademark of Varian Medical Systems. SpaceClaim is a trademark of ANSYS, Inc. All other trademarks are property of their respective owners VARIAN MEDICAL SYSTEMS.

2 Attila4MC Software for simplifying Monte Carlo Supports MCNP 6.1 and MCNP6.1.1 through the new unstructured mesh capability Robust CAD integration Graphical user interface (GUI) based calculation set-up Importance based variance reduction Deterministic weight windows variance reduction (beta feature) SpaceClaim Direct Solid Modeling (optional) 2

3 From CAD to MCNP Attila4MC can directly import CAD models in the following formats: Parasolid (.x_t) and ACIS (.sat) With the SpaceClaim * add-on, the following formats can also be imported: STEP, Pro/Engineer, SolidWorks, Inventor, Catia, and STL Attila4MC automatically generates a mesh for MCNP Automatic curvature based adaption to capture small features Surrounding void/air part not needed for MCNP Background region can be assigned an independent material * Varian has an OEM agreement to distribute SpaceClaim as an integrated component of Attila4MC 3

4 SpaceClaim Add-On Provides Attila4MC users with full solid model creation and geometry repair capabilities Developed with Computer Aided Engineering in mind Engineers who are not CAD experts Typical solid modeling systems are feature based: Parts constructed and modified by editing and changing features in a tree In SpaceClaim, you touch the model to make changes Analogous to virtual play-dough or building blocks Faces, edges, vertices, etc. are selected and modified primarily using 4 simple tools: Any model can be imported and modified as if it was natively built inside SpaceClaim Ideal for engineers who have to deal with messy CAD models from disparate sources. Automated tools for CAD model cleanup and preparation Clean up of gaps, overlaps, interferences, etc. Defeaturing and simplifying for analysis 4

5 Attila4MC Calculation Set-Up For most fixed source analyses, the MCNP calculation can be set up entirely through the Attila4MC GUI, including: Source specification Material definitions, including import of materials from legacy MCNP input decks Material-to-region assignments MCNP solver controls Tally specifications Attila4MC outputs the MCNP input files, which can be manually edited Heavily commented, easy to read Options to launch MCNP directly from GUI, and to pack a zip file for running on another machine 5

6 Automated Importance Generation Attila4MC includes an automatic importance setting for particle population balance with geometry splitting: Splitting of thick shields easily done with SpaceClaim User supplies initial guess for importances and enables automatic importance feature Attila4MC runs successive iterations of MCNP, setting importances to maintain particle population balance Importance optimization of multiple shields in a given calculation can be done Regions are grouped by importance onto an Importance Level. Users can define a fixed importance to each Level or the importance can be automatically calculated. 6

7 Weight Windows Variance Reduction Automated weight windows with consistent source biasing 1 is available as an optional add-on for Attila4MC (beta feature) Weight windows calculated through the deterministic Attila solver 1 J Wagner, A Haghighat, Automated Variance Reduction of Monte Carlo Shielding Calculations Using the Discrete Ordinates Adjoint Function, Nuclear Science and Technology, Vol 128(2), Feb

8 Varian Imaging Components For more info contact or 2016 VARIAN MEDICAL SYSTEMS.