END-TO-END BEAM SIMULATIONS FOR THE MSU RIA DRIVER LINAC*

The Rare Isotope Accelerator (RIA) [1] driver linac proposed by Michigan State University (MSU) will use a 10th sub-harmonic based, superconducting, cw linac to accelerate light and heavy ions to final energies of 400 MeV/u with beam powers of 100 to 400 kW. The driver linac uses for acceleration superconducting quarter-wave, half-wave, and six-cell elliptical cavities with frequencies ranging from 80.5 MHz to 805 MHz, and for transverse focusing superconducting solenoids and room temperature quadrupoles. For the heavier ions, two stages of charge-stripping and multiple-charge-state acceleration will be used to meet the beam power requirements and to minimize the requisite accelerating voltage. End-to-end, three-dimensional (3D), beam dynamics simulations from the Front End to the output of the driver linac have been performed. These studies include a 3D analysis of multicharge-state beam acceleration, evaluation of transverse misalignment and rf errors on the machine performance, and modeling of the charge-stripping foils and strippingchicane performance. The results of these beam dynamics studies will be presented, and further planned beam dynamics studies will be discussed.