A beat frequency buncher

A superconducting high energy buncher operating at 1312 times the linac frequency has been built and installed, to combine with the low energy buncher operating at 112 the linac frequency. The system is synchronized so the linac and high energy buncher beat frequency remain in phase with the low energy buncher. On linac cycles not corresponding to a primary bunch, the high energy buncher bunches the residual beam away from the linac longitudinal acceptance rather than into it. The resonator for the new high energy buncher was constructed by shortening an existing low-β resonator.