NMR magnet coil system with separate superconducting short-circuited regions for drift compensation as well as method for operation thereof

US6777938B2 · kind B2 · utility

Assignee

• Bruker Biospin GmbH · DE

Inventors

• Klaus Schlenga · Linkenheim-Hochstetten, DE
• Wolfgang Frantz · Karlsruhe, DE
• Gerhard Roth · Rheinstetten, DE
• Pierre-Alain Bovier · Zürich, CH
• Andreas Amann · Edinburgh, GB
• Robert Schauwecker · Zürich, CH

Key dates

• Filing date: Oct 29, 2002
• Grant date: Aug 17, 2004
• Expiry date: Oct 29, 2022

Classification

• Technology area (CPC G): Physics
• CPC primary: G01R33/3815
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

An NMR magnet coil system, comprising superconducting conductor structures, with an inductance L0 for generating a homogeneous magnetic field B0 through which an operating current I0 flows in the persistent mode, and wherein further superconducting switches (S1, S2, . . . Sn−1) are each provided between two points (P1, Q1), (P2, Q2), . . . , (Pn−1, Qn−1) of the winding of the magnet coil system which, during operation, separately superconductingly short-circuit one or more disjoint partial regions (1, 2, . . . , n−1) with the inductances L1, L2, . . . , Ln−1 to generate magnetic field contributions B1, B2, . . . , Bn−1 to the homogeneous magnetic field B0, is characterized in that the following is valid: wherein Bn is the magnetic field contribution to the homogeneous magnetic field B0 of the residual region (n) of the magnet coil system, reduced by the separately superconductingly short-circuited partial regions (1, 2, . . . , n−1) and having the inductance Ln, wherein (L−1)jn is the entry of the jth line and nth column of the inverse of the entire inductance matrix of the magnet coil system and wherein L0 is the total magnetic induc…