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Quench energy dissipation for superconducting magnets

A technology of superconducting magnets and superconducting switches, which is applied to superconducting magnets/coils, magnetic objects, electrical components, etc., can solve the problems of time-consuming and refrigerant consumption

Active Publication Date: 2014-05-07
SIEMENS HEALTHCARE LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Both treatments are time-consuming and refrigerant-intensive

Method used

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  • Quench energy dissipation for superconducting magnets
  • Quench energy dissipation for superconducting magnets

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Embodiment Construction

[0014] According to the invention, means are provided for dissipating energy stored in the magnetic field outside the cryogen vessel in response to the onset of a quench. As mentioned above, quenching can occur spontaneously for any of a number of possible reasons.

[0015] figure 2 A circuit diagram of an embodiment of the invention is shown. As usual, a plurality of magnet coils 10 are connected in series and connected to external current leads 22, 22a for connecting the coils to an external power source. A superconducting switch 23 is connected across the series connection of coils 10 . Once the current is introduced into the coil 10 through the external wires 22, 22a, the superconducting switch 23 is switched on and the current flows through the coil 10 and the switch 23 in a persistent mode. The current remains essentially constant unless a quench occurs. Dashed line 24 marks the boundaries of the cryostat.

[0016] According to an aspect of the invention, a second ...

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Abstract

An energy dissipation arrangement for a cryogenically cooled superconductive magnet comprising a plurality of superconductive coils (10) connected in series and housed within a cryostat (24), comprising a superconducting switch (25) having a superconductive current path (28) in series with the superconductive coils (10); and a resistor (38), external to the cryostat, electrically connected in parallel with the superconductive current path (28) of the superconducting switch (25). The superconductive switch is arranged (26, 32, 30) to open in response to an electric current applied to an associated heater (26; 40).

Description

technical field [0001] The present invention relates to cryogenically cooled superconducting magnets. In particular, the invention relates to means for dissipating the energy released by such magnets during quench. Background technique [0002] As is generally known in the art, a superconducting magnet typically consists of a plurality of coils of superconducting wire cooled to cryogenic temperatures, typically around 4K, at which temperature superconductivity is possible. While cooling, electrical current is introduced into the superconducting coils. Even when disconnected from an external power source, current flows in the coil, providing a magnetic field in a so-called "persistent mode". [0003] A portion of the magnet coil may no longer be superconducting for any of several reasons. For example, a defect in a superconducting wire, a sudden movement of a portion of the wire, a mechanical shock, or the action of an external heat source may cause a portion of the magnet...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F6/00
CPCH01F6/02
Inventor 休·A·布莱克斯
Owner SIEMENS HEALTHCARE LTD