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    CRYOGEN-FREE MAGNET SYSTEM COMPRISING A MAGNETOCALORIC HEAT SINK
    1.
    发明申请
    CRYOGEN-FREE MAGNET SYSTEM COMPRISING A MAGNETOCALORIC HEAT SINK 审中-公开

    公开(公告)号：US20170328968A1

    公开(公告)日：2017-11-16

    申请号：US15592889

    申请日：2017-05-11

    申请人： Bruker BioSpin AG

    发明人： Patrick WIKUS ,  Joerg HINDERER

    IPC分类号： G01R33/38 ,  G01R33/3815

    摘要： A cryostat system is kept at a cryogenic operating temperature without providing or supplying cryogenic fluids by a cryocooler. The cryostat system includes a superconducting magnet arrangement and a heat sink apparatus to prolong the time before the superconducting magnet arrangement quenches/returns to the normally conducting state if active cooling fails. The heat sink apparatus includes magnetocaloric material and is thermally connected to the superconducting magnet arrangement and/or to parts of the cryostat system through which ambient heat can flow to the superconducting magnet arrangement. In this way, the cryostat system can be operated in a truly “cryogen-free” manner while maintaining a sufficiently long time to quench in the event of potential operational malfunctions.

    NMR APPARATUS COMPRISING A SUPERCONDUCTING MAGNET ASSEMBLY AND COOLED PROBE COMPONENTS
    3.
    发明申请
    NMR APPARATUS COMPRISING A SUPERCONDUCTING MAGNET ASSEMBLY AND COOLED PROBE COMPONENTS 审中-公开

    公开(公告)号：US20180045797A1

    公开(公告)日：2018-02-15

    申请号：US15673095

    申请日：2017-08-09

    申请人： Bruker BioSpin AG

    发明人： Joerg HINDERER ,  Robert SCHAUWECKER

    IPC分类号： G01R33/38 ,  G01R33/3815

    CPC分类号： G01R33/3804 ,  G01R33/3403 ,  G01R33/3815 ,  H01F6/04

    摘要： A superconducting magnet assembly includes a cryostat, a vacuum vessel and a refrigeration stage. An NMR probe using the assembly includes comprises cooled probe components, a two-stage cryocooler, and a counter flow heat exchanger. A cooling circuit guides coolant from one outlet of the counter flow heat exchanger back to an inlet of the counter flow heat exchanger via the second cooling stage, a cooled probe component, and a heat exchanger in the cryostat or a heat exchanger in a helium suspension tube. Both the intake temperature of the coolant flowing into the heat exchanger in the cryostat or in the suspension tube and the return flow temperature of the emerging coolant are at least 5 K lower than the operating temperature of the first cooling stage. Excess cooling capacity of the cryocooler reduces the evaporation rate of liquid helium or cools a superconducting magnet in a cryogen-free cryostat.

    MAGNET ASSEMBLY WITH CRYOSTAT AND MAGNET COIL SYSTEM, WITH COLD RESERVOIRS ON THE CURRENT LEADS
    4.
    发明申请
    MAGNET ASSEMBLY WITH CRYOSTAT AND MAGNET COIL SYSTEM, WITH COLD RESERVOIRS ON THE CURRENT LEADS 审中-公开

    公开(公告)号：US20190108932A1

    公开(公告)日：2019-04-11

    申请号：US16155262

    申请日：2018-10-09

    申请人： Bruker BioSpin AG

    发明人： Patrick WIKUS ,  Joerg HINDERER ,  Marco STROBEL

    IPC分类号： H01F6/06 ,  H01F6/04

    摘要： A magnet assembly (1) with a cryostat (2) has a superconducting magnet coil system (3), an active cooling device (4) for the coil system, and current leads (5a, 5b) for charging the coil system. The current leads have at least one normal-conducting region (15a, 15b), wherein multiple cold reservoirs (20) are thermally coupled to the current leads along the normal-conducting region thereof, in order to absorb heat the normal-conducting region during charging of the magnet coil system. The current leads have a variable cross-sectional area B in the normal-conducting region along the extension direction thereof, wherein at least over a predominant fraction of their overall length in the normal-conducting region, the cross-sectional area B decreases from a cold end (18a, 18b) toward a warm end (19a, 19b). This provides a magnet assembly requiring reduced cooling power during charging, with less heat introduced into the magnet coil system in normal operation.