Even with a fixed radio frequency, the output beam energy of this linac can be lowered by switching off the last one or two acceleration tanks. Accordingly, the output beam energy of the RRC can be lowered below the nominal value obtained with the fundamental acceleration harmonics of 9; the acceleration harmonics of 10 and 11 are used for this purpose. The lowest energy of 7MeV/nucleon is obtained at 18 MHz with the acceleration harmonics of 11.
The ECR ion source, named NEOMAFIOS, is operated at 8GHz and generates a mirror magnetic field by permanent magnets. It is compact and consumes less electric power than 20 kW, and is therefore suitable for use at the high voltage injector platform.
Following figure shows a photograph of the RILAC as seen from the injector side.
Injector Type Cockroft-Walton High Voltage Generator Max. Voltage 500 kV Ion Souce ECR (Electron Cyclotron Resonance) Linea Accelerator Type Variable Frequency Wideroe (6 tanks) Frequency Range 17-45 MHz Frequenct Tuning Shorting plate and trimmers Total Accel. Voltage 16 MV Charge/Mass Ration >= 1/28 Dimensions Total length 40 mReturn to the home page of RIKEN Accelerator Research Facility