A separated function drift-tube linac for the ISAC project at TRIUMF

A variable energy drift tube linac (DTL) is required as part of the post-accelerator for the ISAC project at TRIUMF. A novel separated function DTL concept has been developed. Five independent interdigital H-type structures, each operating at 105 MHz and 0/spl deg/ synchronous phase, provide the acceleration, while quadrupole triplets and triple-gap split-ring resonators placed between IH tanks provide periodic transverse and longitudinal focussing respectively. Beam simulations show that the DTL can accelerate beams with little or no emittance growth over the complete energy range. MAFIA has been used to optimize the RF structures. Design and fabrication of the first IH tank is underway. Results of the beam dynamics and MAFIA studies, as well as the final linac specifications are presented. The status of the DTL engineering is summarized.