title: Dipole-mode wakefields in dielectric-loaded rectangular waveguide accelerating structures.
abstract: By applying different symmetric boundary conditions, we found that the transverse wakefields generated by an electron bunch traveling through a partially loaded rectangular dielectric structure at an off center position can be decomposed into corresponding orthogonal longitudinal section electric (LSE) and longitudinal section magnetic (LSM) modes for guided waves as in the case of longitudinal wakefields treated previously. The wakefields are characterized using the normalized shunt impedance R/Q, a function of the geometry of the accelerating structure, for both LSE and LSM modes. A numerical example is given for an X-band waveguide structure and detailed results are given for the several leading transverse wakefield terms. The analytic results obtained are in agreement with the results from the time domain simulation tool MAFIA.
authors.affiliation: High Energy Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA.
authors.forename: Chunguang
authors.initials: C
authors.lastname: Jing
authors.forename: Wanming
authors.initials: W
authors.lastname: Liu
authors.forename: Liling
authors.initials: L
authors.lastname: Xiao
authors.forename: Wei
authors.initials: W
authors.lastname: Gai
authors.forename: P
authors.initials: P
authors.lastname: Schoessow
authors.forename: Thomas
authors.initials: T
authors.lastname: Wong