Figure 4
From: Radiation-induced magnetization reversal causing a large flux loss in undulator permanent magnets
Contour plots of Bz near the surface of the PM; (a) measured for the PM extracted from the entrance of the SACLA undulator (1st segment), (b) computed with the assumption that the area surrounded by the dashed line is initialized by the electron bombardment, and (c) measured for the PM irradiated with the electron beam in the synchrotron.
