In an electron storage ring the electrons lose energy by emitting synchrotron radiation when they are deflected in a magnetic field. It is the task of the RF system to restore this energy loss. In the storage ring SESAME and in a booster, where the electrons are accelerated up to the nominal energy of the storage ring, the RF system must also provide the power to accelerate the beam. Given that the revolution frequency of the electrons in a storage ring is in the radio frequency (RF) range, it is self evident that the energy restoration must also take place in this range. Thus, an RF system with enough power to achieve this purpose must be provided. In addition, the RF system has the function to provide stability to the beam and a large energy acceptance to get a long lifetime. As the length of the electron bunch depends on the characteristics of the RF voltage, one finds that the pulse length and the repetition rate of the emitted SL also depend on the RF frequency. The transfer of power to the electrons is done by a high frequency electromagnetic field inside the cavities. At SESAME powers between 200 and 500 kW have to be transferred to the cavities. This field is generated in the klystron and transferred to the cavities through the wave guide system. A picture of RF-system of ANKA, where one klystron is feeding two cavities, is shown in Figure (8.1). A schematic overview of the whole RF-system is given in figure (8.2)…

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