INVESTIGATION AND OPTIMIZATION OF LOW-ENERGY HEAVY-ION BEAM DYNAMICS IN PERIODIC AXISYMMETRICAL STRUCTURES WITH DC FOCUSING

作     者：Dyubkov, Vyacheslav Sergeevich Masunov, Eduard Sergeevich 

作者机构：Moscow Engn Phys Inst State Univ Dept Electrophys Facil Moscow 115409 Russia 

出 版 物：《INTERNATIONAL JOURNAL OF MODERN PHYSICS A》 

年 卷 期：2009年第24卷第5期

页      面：843-856页

核心收录：

学科分类：07[理学] 0702[理学-物理学] 

主　　题：Electrostatic focusing nonlinear beam dynamics structure parameter optimization 

摘      要：It is well-known that nonsynchronous harmonics of a RF field can focus particles. In order to focus ultra-low energy beam particles, a spatially periodic electrostatic. field can be used, too. In this case the transverse focusing is provided by a periodic array of electrostatic lenses. This article is dedicated to questions of two high-current low-energy beam focusing types used in an injector-buncher of an ion linear accelerator, an application of a spatially periodic electrostatic focusing being examined for the. first time. A two-dimensional nonlinear motion equation is derived in the Hamiltonian form in a smooth approximation. It allows us to study a correlation between the longitudinal and transverse ion beam dynamics at low energies. An investigation of the phase and transverse beam dynamics stability conditions in the initial part of the linac are given consideration. Conditions of the beam dynamics stability are found and analyzed. An approach to the. field optimization problem is described. A method of the geometric parameter choice is worked out for a realization of the required. field distributions in each structure. To verify the results of the beam dynamics stability analysis and optimized structure parameter choice, numerical simulations of low-energy heavy-ion beams are carried out.