Resonance Structure with Magnetic Coupling Windows for Low and Intermediate Energy Linear Ion Accelerators

Abstract

The results of a comparative investigation of different types of resonance structures for the initial part of low- and intermediate-energy ion accelerators (to 10‐15 MeV) are presented. Numerical modeling of the electromagnetic oscillations is performed. The advantages and disadvantages of the structures studied are noted. A structure with magnetic coupling windows is examined in detail. The mechanism of electromagnetic oscillations in such structures is investigated by means of equivalent circuits. One of the main problems of proton and ion accelerator design remains the development of a compact and energyefficient initial part, which must afford the formation, bunching and acceleration of a beam obtained from an ion source to energy of several MeV/nucleon. The present article examines the possibility of using a unified resonance structure for all sections of the initial part of a linear ion accelerator. Structures based on H-type resonators are energy-efficient structures for the initial part of a linear ion accelerator. They can be divided conventionally into structures operating on quadrupole (four-chamber) and dipole (two-chamber) types of oscillations and structures with electrodes on vertical planar supports. Characteristically, for a conventional four-chamber resonator the quadrupole working and dipole oscillations are not adequately separated. This is especially strongly manifested in long resonators. This is what led to the development of structures with magnetic coupling windows. Resonance Structure with Magnetic Coupling Windows. Windows are cut into the interchamber partitions of