The design of the RF cavity for the heavy ion storage ring for atomic physics

Abstract

An rf cavity and drive system have been designed for the proposed heavy ion storage ring for atomic physics (HISTRAP) at Oak Ridge. A peak accelerating voltage of 2.5 kV per turn is required with a continuous tuning range from 200 kHz through 2.7 MHz. A single-gap, half-wave resonant configuration is used with biased ferrite tuning. The cavity structure is completely outside of the beam line/vacuum enclosure except for a single rf window that serves as an accelerating gap. Physical separation of the cavity and beam line permits in situ vacuum baking of the beam line components at 300°C. A prototype cavity was designed, built, and tested [S.W. Mosko et al., Proc. 1989 IEEE Particle Accelerator Conf., p. 193]. Development of frequency synthesizer and tuner control circuitry is under way.