Variable Energy Accelerating Structure

The problem of varying energy in an ion linac is discussed leading to the proposal of a new type of accelerating structure. The proposed structure is derived from the so called H-type structure and operates with travelling waves. The variation of the output energy based on the modification of the phase law is achieved by means of simple adjustment. Verifications have been carried out on experimental models. Field distribution and phase shift law have been studied with standing waves as well as with travelling waves.