Design of the Driver Linac for the Rare Isotope Accelerator *

ACCELERATOR * P.N. Ostroumov, J.A. Nolen and K.W. Shepard, ANL, Argonne, IL 60439, USA Abstract The proposed design of the Rare Isotope Accelerator (RIA) driver linac is a cw, fully superconducting, 1.4 GV linac capable of accelerating uranium ions up to 400 MeV/u and protons to 1 GeV with 400 kW beam power. An extensive research and development effort has resolved many technical issues related to the construction of the driver linac and other systems of the RIA facility. In particular, record intensities of heavy ion beams have been demonstrated with the ECR ion source VENUS at LBNL, the driver front end systems including two-chargestate Low Energy Beam Transport (LEBT) and RFQ are being tested, and a set of SC accelerating structures to cover velocity range from 0.02c to 0.7c have been developed and prototyped. Newly developed highperformance SC cavities will provide the required voltage for the driver linac using 300 cavities designed for six different geometrical betas.