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A design of novel type superconducting magnet for super—high field functional magnetic resonance imaging by using the harmonic analysis method of magnetic vector potentials

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Chinese Physics B 2002年第10期11卷 1008-1012页

作者：俎栋林郭华等 BeijingKeyLaboratoryofMedicalPhysicsandEngineering InstituteofHeavyIonPhysicsSchoolofPhysicsPekingUniversityBeijing100871CHina BeijingKeyLaboratoryofMedicalPhysicsandEngineering InstituteofHeavyIo

The approach of expanding the magnetic scalar potential in a series of Legendre polynomials is suitable for designing a conventional superconducting magnetic resonance imaging magnet of distributed solenoidal configuration. Whereas the approach of expanding the magnetic vector potential in associated Legendre harmonics is suitable for designing a single-solenoid magnet that has multiple tiers, in which each tier may have multiple layers with different winding lengths. A set of three equations to suppress some of the lowest higher-order harmonics is found. As an example, a 4T single-solenoid magnetic resonance imaging magnet with 4 × 6 layers of superconducting wires is de signed The degree of homogeneity in the 0.5m diameter sphere volume is better than 5.8 ppm. The same degree of homogeneity is retained after optimal integralization of turns in each correction layer. The ratio Bm/Bo in the single-solenoid magnet is 30%lower than that in the conventional six-solenoid magnet. This tolerates higher rated superconducting current in the coil. The Lorentz force of the coil in the single-solenoid system is also much lower than in the six-solenoid system. This novel type of magnet possesses significant advantage over conventional magnets, especially when used as a super-high field functional magnetic resonance imaging magnet.

关键词： super-high field superconducting magnet for functional magnetic resonance imaging high homogeneity functional magnetic resonance imaging magnet single-solenoid type func- tional magnetic resonance imaging magnet magnetic vector potential harmonic anal

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Numerical Implementation of Meshless Method for Electromagnetic Field Governing Equations

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Journal of Shanghai Jiaotong university(Science) 2010年第5期15卷 535-540页

作者：阳恩会王石刚莫锦秋徐威曹家勇 School of Mechanical Engineering Shanghai Jiaotong University

For electromagnetic governing equations formulated by magnetic vector potential and electric scalar potential,its detailed numerical implementation is achieved by using meshless method and Galerkin *** essential boundary and interface condition of electromagnetic field are imposed by means of Lagrange multiplier ***,the influences of interpolation point number at essential boundary and interface on computational results are also *** are given to validate the effects of meshless method and Lagrange multiplier approach for electromagnetic field.

关键词： meshless method electromagnetic equations Lagrange multiplier magnetic vector potential

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