Patent ID: 7889046

Claim:
A conductor assembly of the type which, when conducting current, generates a magnetic field or in which, in the presence of a changing magnetic field, a voltage is induced, comprising: a first layer tubular in shape formed about an axis, the axis including a curved portion, along which a conductor may be positioned to define a first conductor path, the first layer including a curved portion having a shape that includes a curve extending along the curved portion of the axis; and a first conductor arranged about the curved portion of the first layer in a first helical configuration, the configuration including a curved segment, helical in shape and formed about the curved portion of the axis, the configuration positioned about a curved aperture region within the layer and capable of sustaining a magnetic field having multipole components oriented in directions transverse to the axis, wherein the curved aperture region extends outward from the curved portion of the axis a radial distance to the first layer curved portion; portions of each helical configuration positioned along a layer curved portion are capable of generating a magnetic field in the curved aperture region along a plane passing through a point along the curved segment of the first helical configuration; and the field along directions parallel to the plane includes a first dominant component of multipole order A and one or more second components each of different order than A, wherein at 80 percent of the radial distance the field contribution along the plane by each of the one or more second components is at least 10 3 times smaller in magnitude than the magnitude of the first dominant component of order A.