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Magnet assembly and a method for constructing a magnet assembly

A magnet component and magnet technology, applied in the direction of magnetic objects, superconducting magnets/coils, inductors/transformers/magnets, etc., can solve problems such as adverse effects of magnet magnetic field time stability

Active Publication Date: 2007-07-04
SIEMENS HEALTHCARE GMBH
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Problems solved by technology

Movement of the coil position caused by gradient coil pulsing can also have an adverse effect on the spatial homogeneity of the generated magnetic field, but since the force caused by the gradient field is applied periodically, the displacement caused by the gradient field can also have a negative effect on the Temporal stability of the magnetic field of the magnet adversely affects

Method used

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  • Magnet assembly and a method for constructing a magnet assembly
  • Magnet assembly and a method for constructing a magnet assembly
  • Magnet assembly and a method for constructing a magnet assembly

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Embodiment Construction

[0015] As is known, superconducting magnet coils are very sensitive to quenching processes. Even a small input of energy at a certain point within a superconducting coil may be sufficient to cause a portion of the superconducting wire to become normal, ie, resistive. Once a small portion of the superconducting wire has become resistive, the current flowing in the coil will cause further heating of the resistive portion of the wire. This heating in turn causes more of the wire to become resistive. This continues until all the energy stored in the superconducting coil has been dissipated as heat. Of course it is important to avoid this happening by chance as much as possible.

[0016] As mentioned above, it is known that when a superconducting coil is operated as part of a magnet structure, the superconducting coil is subjected to relatively large forces. If a portion of the coil suddenly moves due to the force exerted on the coil overcoming the frictional interaction between...

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Abstract

A magnet assembly comprising a former having an outer surface ( 20 ) with a cavity ( 12 ) formed therein, and a coil ( 14 ) wound into the cavity ( 12 ), said cavity being of greater depth than the coil, wherein the coil is overlain with a layer of filler material ( 18 ) of sufficient thickness that its outer surface at least aligns with the outer surface of the former ( 20 ); a clamp ( 22, 30 ) is provided, over at least part of the surface of the layer of filler material, and fastened to the outer surface of the former; and the filler material and the coil are impregnated with a solid material.

Description

technical field [0001] The invention relates to a magnet comprising an electrically conductive coil wound onto a former. More specifically, the present invention relates to a superconducting magnet having a coil of superconducting wire wound onto a former made of a material having a greater coefficient of thermal expansion than the material of the wire. The present invention can be applied to solenoid magnets and magnets with other structures as long as they are wound onto bobbins. In particular, the present invention relates to magnets having coils wound in cavities formed on the outer surface of the former. Background technique [0002] Superconducting magnets are known for use in nuclear magnetic resonance imaging, nuclear magnetic resonance spectroscopy or magnetic resonance imaging. Although the magnet structure of the present invention can be effectively applied in these technologies. However, the invention is by no means limited to these applications. [0003] A r...

Claims

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Application Information

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IPC IPC(8): H01F6/00H01F6/06H01F41/00
CPCH01F41/0687H01F5/02H01F6/06H01F27/327H01F41/127H01F27/303H01F41/098
Inventor S·J·卡尔弗特P·J·达维斯
Owner SIEMENS HEALTHCARE GMBH
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