Battery operation of superconducting magnet

Battery energy can be used for superconducting magnet operation if the current of the battery is controllable. Several current-control methods are discussed: variation of electrolyte temperature, variation of exposed electrode area, and the mechanical switching of cells. A circuit for continuously controlling the current using mechanical switches was proposed and a demonstration experiment, in which “D” size Ni-Cd batteries were used for the smooth control of the current up to 45 A, was successfully performed