GB1327551A - Method of producing dipole and multiple magnet windings and coil arrangements produced by the said method - Google Patents

Abstract

1327551 Electromagnets KERNFORSCHUNG mbH GES FUER 21 March 1972 [23 March 1971] 13041/72 Heading H1D Dipolar and multipolar magnet coils for a particle-optical device utilize superconductive windings cooled with liquid He, and are arranged to surround a cross sectional area approximating the overlap region for pair of ellipses whose minor axes are displaced from but parallel to each other; so as to provide a homogeneous field over the cross sectional area common to both (Fig. 1, not shown). The cross sections of the windings are situated in spaces outside the overlap region and lying between the peripheries of the ellipses, and the sum of the rectangular cross sections equals the area of the spaces. The coils have a common axis of symmetry 7 and each conductor has a rectangular crosssection 8 with the coils arranged symmetrically about the axis 3. The cross sectional width c is the same for each coil, and the height h is variable, but identical for two coils located at equal distances from axis 3 (Fig. 2). The dimensions of the rectangular conductors may be determined for a given field strength by programming a computer to determine a rectangular conductor arrangement from multi-poles; the dimensions being varied to compensate or eliminate undesirable field variations and the field homogeneity being improved by successive iteration (Fig. 3, not shown). Each coil element 11 (Fig. 4a) is wound in rectangular form, and bent at right angles along lines 12, 13 to form a coil with winding ends 14 at right angles to the magnet axis (Fig. 4b). The individual coils 11 are assembled into the dipolar construction of Fig. 5. Their rectangular cross - sections have graduated heights and uniform widths, and are spaced apart at graduated distances along the major axis of an ellipse, to develop a homogeneous dipolar or quadrupolar field along an axial crosssectional area.