Pole-Face Windings. Part I—Design

Abstract

At fields over 10 000 gauss the effects of saturation in the Cosmotron magnet cause deterioration of the field pattern which rapidly becomes serious enough to cause complete loss of the proton beam. This pattern can be restored adequately up to 14 000 gauss by passing current through single-layer windings on the faces of the magnet poles. Peak correction current required at 14 000 gauss is about 300 amp per radial inch of each winding. The pole-face winding returns are so arranged that the winding is almost completely decoupled from the main magnetizing winding. The windings and their power supplies are in place but are not yet energized. Several turns of the winding are used in a self-powered correction for the distortion of the magnetic median surface at injection fields.