Experiments with a new type adiabatic crossed-field gun

In this paper experiments with a "long" crossed-field gun, designed by a method given by Kino, are described. This gun yielded the predicted value of current, but the other characteristics of the beam were not in accordance with the results of the theory. Experiments were carried out from which it may be concluded that there are RF instabilities present in the beam, instabilities which grow in the drift region and are generated at the cathode. The rate of growth of these instabilities is of the same order as the rate of growth of RF fields given by the theory of McFarlane and Hay.