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    METHOD FOR CHARGING A SUPERCONDUCTOR MAGNET SYSTEM, WITH A MAIN SUPERCONDUCTOR BULK MAGNET AND A SHIELD SUPERCONDUCTOR BULK MAGNET
    8.
    发明公开
    METHOD FOR CHARGING A SUPERCONDUCTOR MAGNET SYSTEM, WITH A MAIN SUPERCONDUCTOR BULK MAGNET AND A SHIELD SUPERCONDUCTOR BULK MAGNET 审中-公开

    公开(公告)号：EP3822992A1

    公开(公告)日：2021-05-19

    申请号：EP19209166.8

    申请日：2019-11-14

    申请人： Bruker Switzerland AG

    发明人： March, Stephen Alfred ,  Hinderer, Jörg ,  Heiss, Stephan

    IPC分类号： H01F6/00 ,  G01R33/3815 ,  H01F6/04 ,  H01F13/00

    摘要： The invention relates to a method for charging a superconductor magnet system (3) comprising coaxially a main superconductor bulk magnet (10) and a shield superconductor bulk magnet (11), the method comprising the following steps:
    step a) arranging the superconductor magnet system (3) at least partially within a charger bore (6) of a charger magnet (2),
    step b) with T main > T main crit and T shield > T shield crit , applying an electrical current I charger to the charger magnet (2) and increasing I charger to a first current I 1 >0,
    step c) lowering T main to or below an operation temperature T main op of the main superconductor bulk magnet (10), with T main op main crit , while keeping T shield > T shield crit ;
    step d) lowering I charger to a second current I 2 main is induced in the main superconductor bulk magnet (10);
    step e) lowering T shield to or below an operation temperature T shield op of the shield superconductor bulk magnet (11), with T shield op shield crit ;
    step f) increasing I charger to zero, wherein a shield persistent current IP shield is induced in the shield superconductor bulk magnet (11);
    step g) removing the superconductor magnet system (3) from the charger bore (6) of the charger magnet (2), and keeping T main at or below T main op with T main op main crit as well as T shield at or below T shield op with T shield op shield crit ; with T main : temperature of the main superconductor bulk magnet (10); T main crit : critical temperature of the main superconductor bulk magnet (10); T shield : temperature of the shield superconductor bulk magnet (11); and T Shield crit : critical temperature of the shield superconductor bulk magnet (11). The invention allows to reduce the stray field of the superconductor magnet system, wherein less weight and space is required for shielding purposes.

    METHOD AND DEVICE FOR CONTROLLING A MAGNETIC RESONANCE IMAGING SYSTEM
    10.
    发明公开
    METHOD AND DEVICE FOR CONTROLLING A MAGNETIC RESONANCE IMAGING SYSTEM 审中-公开

    公开(公告)号：EP3739353A1

    公开(公告)日：2020-11-18

    申请号：EP19174690.8

    申请日：2019-05-15

    申请人： Siemens Healthcare GmbH

    发明人： Bampton, Adrian ,  Biber, Stephan ,  Johnstone, Adam Paul ,  Nistler, Jürgen ,  Potthast, Andreas ,  Vester, Markus ,  de Oliveira, Andre

    IPC分类号： G01R33/389 ,  G01R33/58 ,  G01R33/3815

    摘要： The invention describes a calibration method for calibrating a measuring element for determining the electric current I flowing through a basic-field magnet of a magnetic resonance imaging system, comprising the steps:
    - performing a measurement with the measuring element,
    - performing a frequency measurement in the magnetic field of the basic-field magnet with a frequency measuring unit,
    wherein the measurement of the measuring element and the frequency measurement are corresponding to the same magnetic field of the basic-field magnet,
    - calculating a calibration factor based on the deviation between the measurement of the measuring element and the frequency measurement,
    - calibrating the measuring element or the electric current in the basic-field magnet based on the calibration factor.
    The invention further describes a ramping method, a system for calibrating a measuring element, a magnet power supply unit, a control unit and a magnetic resonance imaging system.