Status of low and intermediate velocity superconducting accelerating structures

Several types of reduced velocity (0.1 - 0.6c) superconducting accelerating structures are being developed for ion linacs to be used for spallation sources, exotic beam facilities, and other applications. This paper briefly reviews the characteristics and development status of some of the cavity types currently under development. Two different structure choices for the high-energy section of the proposed RIA driver linac are discussed.