A superconducting magnet (30, 130, 230, 330, 430, 530, 630) for producing part of a substantially toroidal field in a device, the toroidal field having an axis of rotation and a perpendicular midplane, the superconducting magnet comprising: a set of conductors comprising a plurality of first superconducting conductors (31, 131, 231, 331, 431, 531, 631) and a plurality of second superconducting conductors (32, 132, 232, 232, 332, 432, 532, 632); wherein each of the plurality of first superconducting conductors passes through the midplane at a smaller distance from the axis of rotation than does each of the plurality of second superconducting conductors; a set of joints (33, 133, 233); wherein each of the joints is positioned away from a midplane of the toroidal field, and the joints are positioned on alternating sides of the midplane; wherein each joint connects an elongate connection region of a first superconducting conductor with an elongate connection region of a second superconducting conductor; wherein each joint connects different said first and second superconducting conductors so as to form a series of alternating first and second superconducting conductors (31f 1, 32f 1, 31f 2, 32f 2, 31f 3, 32f 3; 131f 1, 132f 1, 131f 2, 132f 2, 131f 3, 132f 3; 231 1, 232 1, 231 2, 232 2) corresponding to at least part of a winding of the magnet; wherein the elongate connection region of a respective said first superconducting conductor that is connected by a respective said joint is at or near an end of that first superconducting conductor and the end of that first superconducting conductor is at or near a furthest extent of that first superconducting conductor from the midplane; wherein the elongate connection region of a respective said second superconducting conductor that is connected by the respective joint is at or near an end of that second conducting conductor and the end of that second superconducting conductor is at or near a furthest extent of that second superconducting conductor from the midplane; and wherein each of the elongate connection regions extend with its elongation direction in a direction substantially parallel to the axis of rotation. a set of conductors comprising a plurality of first superconducting conductors (31, 131, 231, 331, 431, 531, 631) and a plurality of second superconducting conductors (32, 132, 232, 232, 332, 432, 532, 632); wherein each of the plurality of first superconducting conductors passes through the midplane at a smaller distance from the axis of rotation than does each of the plurality of second superconducting conductors; a set of joints (33, 133, 233); wherein each of the joints is positioned away from a midplane of the toroidal field, and the joints are positioned on alternating sides of the midplane; wherein each joint connects an elongate connection region of a first superconducting conductor with an elongate connection region of a second superconducting conductor; wherein each joint connects different said first and second superconducting conductors so as to form a series of alternating first and second superconducting conductors (31f 1, 32f 1, 31f 2, 32f 2, 31f 3, 32f 3; 131f 1, 132f 1, 131f 2, 132f 2, 131f 3, 132f 3; 231 1, 232 1, 231 2, 232 2) corresponding to at least part of a winding of the magnet; wherein the elongate connection region of a respective said first superconducting conductor that is connected by a respective said joint is at or near an end of that first superconducting conductor and the end of that first superconducting conductor is at or near a furthest extent of that first superconducting conductor from the midplane; wherein the elongate connection region of a respective said second superconducting conductor that is connected by the respective joint is at or near an end of that second conducting conductor and the end of that second superconducting conductor is at or near a furthest extent of that second superconducting conductor from the midplane; and wherein each of the elongate connection regions extend with its elongation direction in a direction substantially parallel to the axis of rotation.