Design method for open magnetic resonance superconducting magnet

A technology of nuclear magnetic resonance and design methods, applied in superconducting magnets/coils, magnetic objects, measuring magnetic variables, etc., can solve problems such as poor applicability, large current in magnet structures, and difficulty in implementation

Active Publication Date: 2012-03-14
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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Problems solved by technology

[0005] These methods are mainly effective for certain types of magnets. For example, the design of cylindrical magnets is not suitable for the design of open magnets. The resulting magnet structure often has too much total current and the highest magnetic field is too large, which is difficult to implement.

Method used

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  • Design method for open magnetic resonance superconducting magnet
  • Design method for open magnetic resonance superconducting magnet
  • Design method for open magnetic resonance superconducting magnet

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Embodiment Construction

[0048] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0049] figure 1 is the solution area obtained according to the design parameters. According to the superconducting magnet for the central magnetic field B 0 , stray magnetic field B s and the requirements of the uniformity of the magnetic field in the DSV, determine the solution area 1 in the (r, z) cylindrical coordinates as (R 2 -R 1 ,-L) to (R 2 -R 1 , L).

[0050] figure 2 It is a flow chart of the design method of the NMR superconducting magnet based on the seed coil.

[0051] Step 1, search to determine the number and location of the seed coils;

[0052] Step 2, solving the ampere-turns of the seed coil;

[0053] Step 3, determining the cross section of the seed coil according to the ampere-turns of the seed coil to form an initial coil;

[0054] Step 4, use the initial coil as the main magnetic field coil, add a pair of shim ...

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Abstract

The invention discloses a design method for an open magnetic resonance superconducting magnet. The design method uses a method for searching a seed coil and comprises the following steps of: determining a solving region according to design parameters of the magnetic resonance superconducting magnet; searching from the solving region and calculating to obtain the quantity and the position of the seed coil according to set constraint conditions; then solving by using a regularization method to obtain ampere turns of the see coil; selecting work current density, determining the section of the seed coil and forming a structure of an initial coil; and with the initial coil as a main magnetic field coil, adding a shield coil and further optimizing to enable a magnetic filed generated by the magnetic resonance superconducting magnet to meet the requirements of the uniformity of the magnetic filed and a stray magnetic field in a uniform region ball domain of the magnet.

Description

technical field [0001] The invention relates to a design method of a superconducting magnet, in particular to a design method of an open nuclear magnetic resonance superconducting magnet. Background technique [0002] The traditional nuclear magnetic resonance magnet system is mainly formed by coaxially placing multiple cylindrical superconducting coils, and the magnetic field uniformity of the magnet system is less than 1ppm within a 50cm spherical range. From the perspective of the development of interventional therapy and medical diagnostic technology, a completely open magnet system is needed to meet the needs of medical interventional therapy. Cylindrical superconducting coils can only provide magnets with a length greater than 1.25m due to the need for uniformity. The cost and manufacturing technology of magnets with shorter lengths are more difficult, and superconducting coils using NbTi materials cannot reach acceptable levels. Therefore, it is necessary to invent n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F6/00H01F41/02G01R33/3815
Inventor 王秋良胡新宁王春忠王晖严陆光戴银明
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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