The split-loop resonator as a superconducting heavy ion accelerating element

Ion acceleration tests utilizing a superconducting split-loop resonator at accelerating potentials above 2.7 MV/m have been made on ions up to mass 29 and charge state 12. The velocity acceptance and transit time effects were measured and found to be in good agreement with theoretical estimates. Because of the very low energy content of this resonator, the rf power dissipation at low β is less than 10% of an equivalent reentrant cavity design thus relaxing requirements on the superconducting surface resistance and on the phase stabilizing system.