Actively shielded superconducting magnet assembly with a device for additional fringe field optimization
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United States of America Patent
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Aug 24, 2004
Grant Date -
Dec 25, 2003
app pub date -
Jun 9, 2003
filing date -
Jun 22, 2002
priority date (Note) -
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Abstract
A magnet assembly for generating a magnetic field (H) in the direction of a z axis in a working volume (AV) comprises an actively shielded superconducting magnet coil system (M) and at least one current path (P1, . . . , Pn) which is superconductingly closed in the operating state. The actively shielded superconducting magnet coil system (M) has a radially inner partial coil system (C1) and a radially outer partial coil system (C2) disposed coaxially with respect to each other. An external device supplies current to the current paths (P1, . . . , Pn) to charge each path to a respective current (IP1, . . . , IPn) in the operating state. When optimizing the fringe field behavior outside of the magnet system, the overall magnitude of magnetic dipole moments of the current paths (P1, . . . , Pn), charged to their respective operating currents (IP1, . . . , IPn), is at least 0.1% of the magnitude of the magnetic dipole moment of the charged partial coil system (C2). When charging the current paths (P1, . . . ,Pn) to their respective operating current (IP1, . . . , IPn), the resulting change .DELTA..sub.H2 of the coefficient of second order (H2) of the polynomial expansion of the magnetic field (H) of the magnet assembly is given by: .vertline..DELTA..sub.H2.vertline.
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