Design of a High Current RFQ Injector with High Duty Factor

An RFQ injector with a duty factor up to 10 % is planned for the spallation source ISIS at Rutherford Appleton Laboratory (RAL). The accelerator will be a Four-Rod RFQ with directly cooled electrodes, operating at 202 MHz. The RFQ will provide a H-beam current up to 50 mA with an output energy of 665 keV (input energy 50 keV). The beam dynamics, rf and mechanical designs are presented.