Actively shielded superconducting magnet assembly with a device for additional fringe field optimization
US6781494B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 9, 2003 |
| Grant date | Aug 24, 2004 |
| Priority date | — |
| Expiry date | Jun 9, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R33/421
- 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) 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 &Dgr;H2 of the coefficient of second order (H2) of the polynomial expansion of the magnetic field…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.