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Ascending and descending field auxiliary device for superconducting magnet

An auxiliary device, superconducting magnet technology, applied in superconducting magnets/coils, measuring devices, magnetic objects, etc., can solve the problems of reducing current density, difficulty in implementation, increasing magnet volume and cost, etc.

Active Publication Date: 2014-04-09
SIEMENS SHENZHEN MAGNETIC RESONANCE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] First, adding more copper to the coils of a superconducting magnet reduces the current density, which reduces high temperature and voltage, but increases magnet size and cost
[0009] Second, if the active quench protection technology is used, the reliability of the detector should be improved as much as possible, but in addition to being quite difficult to implement, the magnet protection will also become quite complicated accordingly, and the cost of the magnet will increase
[0010] Third, the secondary coil is better coupled to the superconducting magnet coil, but during the quench process, the energy of the superconducting magnet is released in the cooling shield, which also consumes a large amount of liquid helium
But infinite subdivision is not feasible given the configuration of the magnet coils
In addition, the energy of the magnet is still released in the cooling shield, consuming a large amount of liquid helium; at the same time, in the process of magnet lifting and lowering the field, the resistance will generate Joule heat, if the resistance and the superconducting magnet are too close, this may cause the superconducting magnet to fail. overtake

Method used

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  • Ascending and descending field auxiliary device for superconducting magnet
  • Ascending and descending field auxiliary device for superconducting magnet
  • Ascending and descending field auxiliary device for superconducting magnet

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment 1）

[0041] figure 1 It is a cross-sectional view of the superconducting magnet and the lifting field auxiliary device according to the specific embodiment 1 of the present invention in the axial direction of the superconducting magnet. Such as figure 1 As shown, the lifting field auxiliary device 100 includes a solid cylinder, which can also be called an energy release component, and the solid cylinder is made of a conductive weak magnetic material (non-ferromagnetic material), that is, a material with high electrical conductivity and low magnetic permeability , such as copper or aluminum. This lifting field assist device 100 (energy releasing member) is used when lifting and lowering a magnet or maintaining the magnetic field of a superconducting magnet.

[0042] Specifically, when the superconducting magnet is quenched, part of the electromagnetic energy will be conducted to the lifting field auxiliary device according to Embodiment 1 of the present invention through current c...

specific Embodiment 2）

[0047] figure 2 It is a cross-sectional view of the superconducting magnet and the lifting field auxiliary device according to the specific embodiment 2 of the present invention in the axial direction of the superconducting magnet. Such as figure 2 As shown, the lifting field auxiliary device 100 includes a hollow cylinder (cylinder), which can also be called an energy release component, and the cylinder (hollow cylinder) is made of conductive weak magnetic material (non-ferromagnetic material), such as copper or aluminum Made of materials with high electrical conductivity and low magnetic permeability. This lifting field assist device 100 (energy releasing member) is used when lifting and lowering a magnet or maintaining the magnetic field of a superconducting magnet. Experiments have shown that the induced current coupled to the superconducting magnet by the lifting field auxiliary device 100 flows only in a small range. The structure of 100 is optimized, that is, the t...

specific Embodiment 3）

[0051] image 3 It is a cross-sectional view of the superconducting magnet and the lifting field auxiliary device according to the specific embodiment 3 of the present invention in the axial direction of the superconducting magnet. Such as image 3 As shown, the lifting field auxiliary device 100 includes an energy release component 101, which is made of a conductive weak magnetic material (non-ferromagnetic material), such as copper or aluminum and other materials with high electrical conductivity and low magnetic permeability; The shell 102 is used to carry the energy release component 101 and the refrigerant; the first refrigeration shielding layer 103 is used to insulate the inner shell 102 and the refrigerant in the inner shell 101 and the energy release component 101 from the outside; the outer shell 104 is used to carry the second A refrigeration shielding layer 103; refrigerant inlet 105 and refrigerant outlet 106 are used to provide refrigerant circulation; a first s...

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Abstract

The invention discloses an ascending and descending field auxiliary device for a superconducting magnet. The ascending and descending field auxiliary device comprises an energy-releasing component, wherein the ascending and descending field auxiliary device is positioned in the superconducting magnet during quenching of the superconducting magnet; and the energy-releasing component is coupled with current of the superconducting magnet. During quenching of the superconducting magnet, a part of electromagnetic energy can be conducted to the ascending and descending field auxiliary device of a specific embodiment of the invention, so that joule heat in a refrigeration shielding layer of the superconducting magnet can be reduced, and a part of liquid helium loss is saved. In addition, the temperature voltage in a coil of the magnet and the power of a quenching transmission heater can be reduced, and quenching protection on the magnet is facilitated.

Description

technical field [0001] The invention relates to a magnetic resonance system, in particular to a lifting field auxiliary device for a superconducting magnet in the magnetic resonance system. Background technique [0002] Magnetic resonance imaging is a biomagnetic nuclear spin imaging technology that has developed rapidly with the development of computer technology, electronic circuit technology, and superconducting magnet technology. In MRI, human tissue is placed in a static magnetic field B 0 In the process, the radio frequency pulse with the same frequency as the precession frequency of the hydrogen nucleus is used to excite the hydrogen nucleus in the human tissue, causing the hydrogen nucleus to resonate and absorb energy; after the radio frequency pulse is stopped, the hydrogen nucleus emits a radio signal at a specific frequency, and the The absorbed energy is released, collected by the receiver outside the body, and the image is obtained after computer processing. ...

Claims

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Application Information

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IPC IPC(8): H01F6/00H01F6/04G01R33/3815
Inventor 杨磊王超
Owner SIEMENS SHENZHEN MAGNETIC RESONANCE
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