2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/87367The transition wake fields excited by relativistic point charge in cylindrical resistive round pipe are studied. The problem has been solved for the infinite pipe with abrupt change of the walls conductivity from perfect boundary condition to resistive. The analytical presentation of the longitudinal monopole wake field is given.6 pages, 3 figures, 18 equationsAccelerator Physicstext