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Optimization design algorithm of superconducting magnet external magnetism shielding coil

A superconducting magnet, optimized design technology, applied in the field of multi-parameter optimization

Active Publication Date: 2014-07-30
NINGBO JANSEN NMR TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, for electromagnetic interference of 1Hz and below, a special circuit must be designed for shielding

Method used

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  • Optimization design algorithm of superconducting magnet external magnetism shielding coil
  • Optimization design algorithm of superconducting magnet external magnetism shielding coil
  • Optimization design algorithm of superconducting magnet external magnetism shielding coil

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Experimental program
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Embodiment Construction

[0053] The present invention will be further described below in conjunction with accompanying drawing:

[0054] The detailed method structure is as follows:

[0055] (1) Given the initial value S 0 ={x 0,1 ,x 0,2 ,...,x 0,n}

[0056] (2) Calculate x i+1,j =x i,j ±Δ i,j

[0057] (3) Evaluate the optimized evaluation standard function Φ. For the optimized evaluation standard function with n degrees of freedom, 2n calculations are required.

[0058] Φ i+1 =min(F(x i+1,1 ,x i+1,2 ,...,x i+1,n ,...,x i+1,2n )), if Φ i+1 i , then Δ i+1,j =Δ i,j α*, otherwise Δ i+1,j =Δ i, / j α, jump to (2);

[0059] (4) If the optimization evaluation standard function meets the requirements, there is Φ i+1 i+1 ,:<β, the optimization fails. exit the loop.

[0060] Taking the design of the external magnetic shielding coil of a 1.5T superconducting NMR instrument as an example, the detailed implementation process of using this method to optimize the design is as follows:

[006...

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Abstract

The invention provides a simple and effective multi-parameter optimization algorithm without interval limitation, in particular to an optimization design algorithm of a superconducting magnet external magnetism shielding coil, which is used for the design of the superconducting magnet external magnetism shielding coil. The invention changes all parameters related to the design of the superconducting magnet external magnetism shielding coil one by one according to the optimization results on the basis of an initial value, in addition, constraint conditions are taken into consideration during the result evaluation, and the coefficients are regulated and changed according to the condition whether the results are optimized or not, so the optimization of the design parameters is realized.

Description

technical field [0001] Based on the large-scale and high-speed computing capabilities of computers, the present invention proposes a simple and effective multi-parameter optimization method without interval restrictions, specifically an optimal design method for external magnetic shielding coils of superconducting magnets for use in superconducting magnets. The design of the magnetomagnetic shielding coil. The optimal design method of the present invention is not limited to the optimal design of the external magnetic shielding coil in the superconducting magnet, and can also be used in any other occasions requiring parameter optimization. Background technique [0002] At present, the overall nuclear magnetic resonance imaging system can apply a special variable magnetic field to a certain part of the human body according to the characteristics of the micro-magnetism of the nucleus of the cell, and then observe the state changes of a certain atom in the magnetic field, supple...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R33/421
Inventor 莫磊史永凌赵华炜
Owner NINGBO JANSEN NMR TECH CO LTD
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