DESIGN OF A DRIFT TUBE LINAC FOR THE ISAC PROJECT AT TRIUMF

The ISAC radioactive ion beam facility under construction at TRIUMF combines an isotope-separator-on-line with a post accelerator. Required in the accelerator chain is a drift tube linac capable of accelerating unstable nuclei with a post strip-per charge to mass ratio of ‚ 1=6 from E = 0:15 MeV/u to a final energy fully variable up to 1.5 MeV/u. Due to the relatively low intensities of some of the ion species continuous (cw) opera-tion of the accelerator is required. A five tank interdigital H-type structure, operating at 105 MHz, has been chosen. The beam dy-namics conceptual design and the results of various particle sim-ulations are presented. Computer modelling of the rf structure and model measurements have been completed and are reported