Microwave power control apparatus for linear accelerator using hybrid junctions

摘要

A control apparatus for controlling RF power supplied to first and second loads is provided. The control apparatus includes a first symmetric hybrid junction having a first port for receiving input RF power, a second port coupled to the first load and a third port coupled to a dummy load. The control apparatus further includes a second symmetric hybrid junction having a first port coupled to a fourth port of the first symmetric hybrid junction and a third port coupled to the second load. First and second variable shorts are respectively coupled to second and fourth ports of the second symmetric hybrid junction. RF power reflected by the first and second variable shorts is controllably directed through the second symmetric hybrid junction to the second load. The amplitude and phase of the RF power supplied to the second load can be controlled independently. In a preferred embodiment, the first and second loads are first and second accelerator guide sections of a linear accelerator, and the control apparatus is used to control the output beam energy of the linear accelerator.