An Engineering Design and Production of Elements of RF Power Feeding and Distributing Systems at IHEP

The 200 MHz accelerating structure for UNK [1] consists of identical RF units, each one containing of two cylinder-shaped cavities, a 3-dB hybrid, coupled with the cavities by coax lines, a rectangular waveguide and 850 kW power amplifier [2]. For a beam loading varying strongly, a part of the RF power reflected from the cavities is directed by the 3-dB hybrid to the dummy load, so a power amplifier sees actually the mathed load and may be connected to the accelerating structure by a long feeder.