Wong, C.Y. Fukushima, K. Lund, S.M. JACoW Geneva, Switzerland 978-3-95450-169-4 10.18429/JACoW-LINAC2016-TUPRC014 English 441-444 TUPRC014 lattice space-charge ion simulation ECR Contribution to a conference proceedings 2017 2017-05 http://dx.doi.org/10.18429/JACoW-LINAC2016-TUPRC014 http://jacow.org/linac2016/papers/tuprc014.pdf Self-consistent simulation studies of the FRIB low energy beam transport (LEBT) system are conducted with the PIC code Warp. Transport of the many-species DC ion beam emerging from an Electron Cyclotron Resonance (ECR) ion source is examined in a realistic lattice through the Charge Selection System (CSS) which employs two 90-degree bends, two quadrupole triplets, and slits to collimate non-target species. Simulation tools developed will support commissioning activities on the FRIB front end which begins early operations in 2017. Efficient transverse (xy) slice simulation models using 3D lattice fields are employed within a scripted framework that is readily adaptable to analyze many ion cases and levels of model detail. Effects from large canonical angular momentum (magnetized beam emerging from ECR), thermal spread, nonlinear focusing, and electron neutralization are examined for impact on collimated beam quality.