RF system for the SLS booster and storage ring

The RF system which was adopted for the SLS (Swiss Light Source) initial phase is based on the use of conventional, already well-proven equipment. In the storage ring (SR), it consists of four 500 MHz plants, each comprising a normal conducting (nc) single-cell cavity of the ELETTRA type, powered with a 180 kW CW klystron amplifier via a WR1800 waveguide line. In spite of the lower power requirement, one similar plant will be used for the booster with the intention of standardizing. Although the use of superconducting (sc) cavities has been ruled out as a starting solution, combining idle (no external RF source) sc cavities with the initial nc system is regarded as a possible way of further improving the beam lifetime in the SR when operating at very high brightness.