Beam dynamics optimization in the rare isotope accelerator driver Linac

A preliminary design of the superconducting linear accelerator of the Rare Isotope Accelerator (RIA) facility has been previously reported. The driver linac consists of about 400 superconducting independently-phased RF cavities, and is able to accelerate beams of any ion, including uranium, to energies of 400 MeV per nucleon and beam power of 400 kW. The linac has the novel capability of accelerating multiple-charge-state beams, which results in a significant increase in available beam current. Use of multiple-charge states imposes strict requirements on the steering procedure to avoid effective emittance growth. A program of detailed beam dynamics studies has been initiated to simplify the accelerator design, enhance its performance, and develop specifications for the engineering design of the accelerator systems. As part of the program, a correction algorithm has been developed that takes into consideration solenoid induced couplings. The correction method and initial results of corrections applied to the low- and medium-energy driver linac sections are presented