Beam test results with the ISAC 35 MHz RFQ

The ISAC 35 MHz split-ring RFQ is designed to accelerate ions of A/q⩽30 from 2 keV/u to 150 keV/u in cw mode at a constant synchronous phase of -25°. Beam tests with 7 of the 19 split rings installed (E_fin=0.55 keV/u) have recently been completed. The tests demonstrated that a constant synchronous phase RFQ with external buncher works splendidly for low beta, low intensity applications. One peculiar aspect of the RFQ is that the longitudinal acceptance is larger for beams injected off-center. The test set-up and results of both the measurements and the simulations are presented and discussed