The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 02, 2004
Filed:
Jun. 09, 2003
Bruker Biospin AG, Faellanden, CH;
Abstract
A magnet assembly for generating a magnetic field (H) in the direction of a z axis in a working volume (AV) disposed on the z axis about z=0 with an actively shielded superconducting magnet coil system (M) and at least one current path (P , . . . , Pn) which is superconductingly closed in the operating state, wherein the actively shielded superconducting magnet coil system (M) comprises a radially inner partial coil system (C ) and a radially outer partial coil system (C ) disposed coaxially with respect to each other and whose magnetic dipole moments have opposite signs in the operating state and differ by an amount &Dgr; , with |&Dgr; |<2.5% of the magnitude of the magnetic dipole moment of the radially inner partial coil system (C ), is characterized in that the current paths (P , . . . ,Pn) are at least temporally superconductingly short-circuited during charging of the actively shielded superconducting magnet coil system (M) and that the current paths (P , . . . , Pn) are designed such that the currents induced therein due to the charging process of the magnet coil system (M) generate an overall magnetic dipole moment of a magnitude of at least 0.1% of the magnitude of the magnetic dipole moment of the charged radially outer partial coil system (C ). Suitable design of the additional current paths compensates for deviations of the fringe field from its design specification, due to deviations of coil parameters from their design values.