TRIUMF, Vancouver
Heavy Ion superconducting cavities and cryomodules have undergone a renaissance in the last ten years as new heavy ion applications are being discussed to support drivers and post-accelerators primarily for radioactive ion beam facilities. The accelerators are characterized by cw operation and the push has been for high Qo at the operating point to get high performance with a reasonable cryogenic load. New features include particulate control in cavity processing and assembly, cryomodules engineered with separated vacuum for beam and thermal isolation volumes, high performance mechanical tuners and rf couplers and layouts with strong periodic focusing to permit high gradient operation. The present state of the art for high gradient operation is the ISAC-II heavy ion linac but many projects are now in preparation or being developed. A survey of the planned projects and facility upgrades will be presented.
