PROPOSAL OF A NORMAL CONDUCTING CW-RFQ FOR THE EURISOL POST-ACCELERATOR AND A DEDICATED β-BEAM LINAC CONCEPT *

A combination of three superconducting RFQs has been proposed for the EURISOL post accelerator layout. At least the first RFQ of this triplet could be replaced by a normal conducting (NC) continuous wave (c.w.) device. Efficient cooling systems have been designed and already applied to existing machines at the IAP in Frankfurt. Preliminary electrode and cavity designs can be presented. Since a parallel use for β-beam applications was intended in the beginning, we have optimized the design not only for heavy ion applications with negligible beam currents at c.w. but also for lighter ions with currents up to 7.5 mA at pulsed operation. More recent investigations on β-beams came up with currents around 50 mA, which then would make a separate linac solution for β-beams necessary. We worked out some preliminary design suggestions for such a dedicated 100 MeV/u machine.