FNAL-Pub-04/136-CD Synergia: an Accelerator Modeling Tool with 3-D Space Charge J. Amundson and P. Spentzouris Fermi National Accelerator Laboratory, Batavia, IL 60510, USA J. Qiang and R. Ryne Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA (Dated: July 27, 2004) Abstract High precision modeling of space-charge effects, together with accurate treatment of single- particle dynamics, is essential for designing future accelerators as well as optimizing the perfor- mance of existing machines. We describe Synergia, a high-fidelity parallel beam dynamics sim- ulation package with fully three dimensional space-charge capabilities and a higher order optics implementation. We describe the computational techniques, the advanced human interface, and the parallel performance obtained using large numbers of macroparticles. We also perform code benchmarks comparing to semi-analytic results and other codes. Finally, we present initial re- sults on particle tune spread, beam halo creation, and emittance growth in the Fermilab booster accelerator. PACS numbers: 1