INDUCTIVE OUTPUT TUBE BASED 300 KW RF AMPLIFIER FOR THE DIAMOND LIGHT SOURCE

All currently operating synchrotron light sources use klystron amplifiers to generate the RF power for the accelerator cavities. In TV broadcasting on the other hand, Inductive Output Tubes (IOT) are replacing the classical klystron based systems in all new high power UHF transmitters since more than ten years. The Diamond Light Source will be the first synchrotron to be operated using IOTs. For each accelerating cavity a total of four IOTs will be combined with a waveguide combiner to achieve the RF power requirement of 300 kW at 500 MHz. All IOTs will be supplied from a common crowbarless high voltage power supply. Three such systems will be installed starting in October 2004. The paper gives an overview of the system design as well as the status of the factory installation and testing at the end of June 2004.