Actively shielded superconducting magnet assembly with improved fringe field compensation
US6700469B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 9, 2003 |
| Grant date | Mar 2, 2004 |
| Priority date | — |
| Expiry date | Jun 9, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R33/3815
- WIPO fieldMeasurement
- WIPO sectorInstruments
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 (P1, . . . , 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 (C1) and a radially outer partial coil system (C2) 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;m, with |&Dgr;m|<2.5% of the magnitude of the magnetic dipole moment of the radially inner partial coil system (C1), is characterized in that the current paths (P1, . . . ,Pn) are at least temporally superconductingly short-circuited during charging of the actively shielded superconducting magnet coil system (M) and that the current paths (P1, . . . , 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 mag…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.