RF System Design for the Slac Storage Ring

In the proposed SLAC electron-positron storage ring, two one-ampere, 3-GeV beams will radiate energy at the rate of 1.13 megawatts with 880-kV peak voltage required for storage. This energy is restored through a six-cavity rf system operating at 50 MHz, the 36th harmonic of the rotation frequency. Of the total power over 90% will be delivered to the beams with the remaining part to the cavities and their associated networks. An experimental ultra-high vacuum cavity designed to operate at 200 kV peak across its accelerating gap and capable of dissipating 20 kilowatts in wall losses is described. The requirements of an automatic tuning and coupling system which will match continuously the cavity and the beam to the amplifier output are discussed.