Split Coaxial RFQ Linac with Modulated Vane

A split coaxial RFQ structure with modulated vanes is under development for the acceleration of very heavy ions, like uranium ions. To fix the vanes tightly to the tank and to attain accurate setting of them, a new structure is proposed: the vanes are supported by stems at several points. As a preparatory study, we have fabricated a 1/4 scaled model of a uranium machine. This model is 2 m in length, and 0.4 m in diameter. Measurements on rf characteristics have been carried out with good results: field balance among the quadrants and field flatness along the beam axis are within ±2.5%