This paper discusses the design and development of two types of intermediate-velocity superconducting cavity and an associated cryomodule for the RIA driver linac. The two cavity types are a 115 MHz, PGEoM = 0.15 quarterwave resonant (QWR) cavity, and a 173 MHz, PGEoM = 0.26 coaxial half-wave cavity. The useful velocity range of the two cavity types extends fmm 0.1 to 0 . 4~. Both cavities are well-conected for dipole and quadrupole asymmetries in the accelerating field. A cryomodule is being designed to incorporate a separate vacuum system for the cavity vacuum in order to provide a clean, lowparticulate environment for the superconducting cavities. This will enable a higher degree of surface cleanliness than has previously been the case for 'EM-type, drifttube-loaded superconducting cavities. The status of prototype cavity and cryomodule construction are reported.
A new cryomodule containing seven low-beta superconducting radio frequency (SRF) cavities has been added to the ATLAS heavy ion linac, providing an additional 15 MV accelerating potential to the existing accelerator. We describe the final stages of cryomodule assembly, commissioning, and installation in the ATLAS accelerator. The clean techniques used to achieve low-particulate rf surfaces are presented, as are the module design features which enable clean assembly and reliable high-gradient operation. The thermal performance of the cryomodule is described, along with performance data for the SRF cavities. Details on subsystem performance including helium and nitrogen systems, vacuum systems, thermal and magnetic shields, slow and fast tuners, and survey/alignment systems are given.
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