Equilibrium and Destruction of a REB in a Magnetic Guide

A REB with a relatively small ¿/ ¿ (320 keV, 0.75 kA and 1.0 MeV, 1 kA) is injected into an axial magnetic guide in the injection system of ERA device of IPP-Nagoya. The beam surface envelope reveals an outstanding spatially periodic structure in the uniform field and the wave length and the REB parameters in the guide are found to be well consistent with the values predicted with a particular kind of the equilibrium model, proposed by Diament a few years ago. A rapid destruction of the REB during the passage through a magnetic hump and with an abrupt change of the surrounding metal wall radius is observed and discussed briefly.