A cathode target assembly (400, 500) for use in sputtering target material onto a substrate comprising: a generally cylindrical target (30, 680, 682) extending about a longitudinal axis, the target configured to rotate about the axis; and a magnetic array (410, 510), the array carried within and extending along that longitudinal axis of the target and supported so as to be optionally maintained in a substantially static state during rotation of the target, the array forming a racetrack configuration comprising inner (420, 520) and outer (430, 530) magnetic poles, the racetrack configuration having a straight portion (440, 540) and opposing end portions (450, 550) thereof, the inner and outer magnetic poles extending parallel to each other in a first direction along the straight portion, characterized in that the inner (420, 520) and outer (430, 530) magnetic poles angularly extend outward from the first direction in defining the end portions to be fan shaped, wherein the inner (420, 520) and outer (430, 530) magnetic poles have separate yet similarly-shaped paths about each of the end portions whereat spacing between the inner (420, 520) and outer (430, 530) poles is substantially constant and wherein the inner (420, 520) and outer (430, 530) magnetic poles at each of the end portions (450, 550) are mounted together to maintain an orientation of the poles that is selectively adjustable relative to the cylindrical target, whereby the inner (420, 520) and outer (430, 530) magnetic poles are adjustable in both spacing and symmetry relative to the cylindrical target via shim stacks (585, 595) each having a non-planar shim, the shim stacks (585, 595) being spaced along a corresponding length of the magnetic array and being centrally situated between the magnetic array (410, 510) and a support rod extending along the longitudinal axis, the shim (585, 595) extending from the support rod wherein the non-planar shims angle across longitudinal hemispheres of the magnetic array (410, 510) so as to provide an asymmetrical magnetic effect across the hemispheres with the effect being uniformly provided on the cylindrical target over the corresponding length of the magnetic array (410, 510). a generally cylindrical target (30, 680, 682) extending about a longitudinal axis, the target configured to rotate about the axis; and a magnetic array (410, 510), the array carried within and extending along that longitudinal axis of the target and supported so as to be optionally maintained in a substantially static state during rotation of the target, the array forming a racetrack configuration comprising inner (420, 520) and outer (430, 530) magnetic poles, the racetrack configuration having a straight portion (440, 540) and opposing end portions (450, 550) thereof, the inner and outer magnetic poles extending parallel to each other in a first direction along the straight portion, characterized in that the inner (420, 520) and outer (430, 530) magnetic poles angularly extend outward from the first direction in defining the end portions to be fan shaped, wherein the inner (420, 520) and outer (430, 530) magnetic poles have separate yet similarly-shaped paths about each of the end portions whereat spacing between the inner (420, 520) and outer (430, 530) poles is substantially constant and wherein the inner (420, 520) and outer (430, 530) magnetic poles at each of the end portions (450, 550) are mounted together to maintain an orientation of the poles that is selectively adjustable relative to the cylindrical target, whereby the inner (420, 520) and outer (430, 530) magnetic poles are adjustable in both spacing and symmetry relative to the cylindrical target via shim stacks (585, 595) each having a non-planar shim, the shim stacks (585, 595) being spaced along a corresponding length of the magnetic array and being centrally situated between the magnetic array (410, 510) and a support rod extending along the longitudinal axis, the shim (585, 595) extending from the support rod wherein the non-planar shims angle across longitudinal hemispheres of the magnetic array (410, 510) so as to provide an asymmetrical magnetic effect across the hemispheres with the effect being uniformly provided on the cylindrical target over the corresponding length of the magnetic array (410, 510).