Patent ID: 7825760

Claim:
An electromagnet capable of creating a conical magnetic field, comprising: a. a center axis running from a first end of said electromagnet to a second end of said electromagnet; b. a central cavity, lying within said electromagnet and running along said center axis; c. wherein said central cavity includes a first conical portion defined by a conical profile; d. a single helical conductor, wrapped around said first conical portion, wherein said single helical conductor is formed by a plurality of 360 degree turns; e. wherein said single helical conductor has a pitch and a cross section; f. wherein said pitch of said single helical conductor varies across said first conical portion; g. wherein said cross section of said single helical conductor has an inner edge, an outer edge, a height, and a width; h. wherein said outer edge lies upon an outer radius measured from said center axis, with said outer radius being constant; i. wherein said inner edge lies upon an inner radius measured from said center axis, with said inner radius being variable within said first conical portion, so that said radius lies on said conical profile within said first conical portion, thereby smoothly varying said width of said cross section within said first conical portion; and j. wherein said height of said cross section is also smoothly varied within said first conical portion in order to maintain a desired cross sectional area for said cross section.