Adiabatic trapping and acceleration of the beam in the booster synchrotron of the ITEP-TWAC accelerating-storage facility

Abstract

A system for adiabatic trapping of injected particles into the acceleration mode was developed and used to increase the intensity of the ion beam accelerated in the booster synchrotron of the ITEP-TWAC accelerating-storage facility at the Institute for Theoretical and Experimental Physics. Using numerical simulation, the parameters of the injected beam were optimized and the conditions for the absence of particle loss upon a changeover into the acceleration mode and subsequent acceleration to the maximum energy were determined. The effect that the characteristics of a system controlling the radio frequency of the accelerating field had on the dynamics of synchrotron motion and the particle loss was investigated. During development and adjustment of a complex of equipment that provided optimal conditions for adiabatic trapping and acceleration of C4+ ions with an initial energy of 1.3 MeV/amu, the trapping efficiency was as high as 80%, being limited only by the initial distribution of the momentum spread in the injected beam.