Abstract-In this paper, an improved analysis of the periodic permanent magnet (PPM) focusing structure for linear beam tubes is presented. An estimation of critical dimensions for the iron pole pieces to avoid magnetic saturation is made. The method is based on the permeance calculation of all possible flux paths using magnetic circuit theory. The analytically calculated axial magnetic field using the present approach is compared with measured and simulated results obtained by using the finite-element-methodbased commercial software ANSYS. The agreement is very good.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.