Yatsenko T. Transport of high-current relativistic charged-particle beams in drift tubes of coaxial and cylindrical geometry

Thesis is devoted to the constricting of the physical model of transportation of moder-ately relativistic charged-particles beam in coaxial and cylindrical drift-tube. In approxima-tion of "strong" magnetic field we find analytical and numerical estimations of the limiting current of relativistic charged-particle beams in coaxial drift-tube with dielectric insert and potential difference between inner and outer coaxial conductors. We obtain the equilib-rium equation of high-current charged-particle beams in hybrid magnetostatic undulator field in coaxial drift-tube with partially shielded cathode and study their dynamics. In the Darwin model, with the help of Green's function method, we calculate the non-relativistic surface-charge density and corrections induced by the point-like charged-particle propa-gating by an arbitrary trajectory in the unbounded in the longitudinal direction cylindrical drift-tube. We formulate a calculation scheme of self-consistent dynamics of moderately relativistic beams.