Low energy part of the CONCERT high-power proton linac

摘要

The 1.3 GeV linac of the CONCERT multi-users facility has toaccelerate protons and H^- ions in a series of current pulsesdistributed over each 20 ms period. The peak current is identical forall pulses to keep the space charge forces about constant apart from aslight emittance change between H⁺ and H^- bunches.The beam power required for a given application is then obtained byadjusting the pulse duration with a total maximum power of 20 MW and 5MW for the proton and H^- beams respectively. The referencedesign of the low-energy part of this linac is made-up of two separateproton and Hⁱnjectors up to 23 MeV, the H^- oneusing a funnelling system. These injectors are followed by a series ofcopper cavities up to the transition with superconducting cavities atabout 185 MeV. The overall architecture, the technical choices and thebeam dynamics in this high-power proton linac front end are presentedand discussed