Design of a Superconducting Magnet for Lorentz Force Electrical Impedance Tomography

Shen, Boyang; Fu, Lin; Geng, Jianzhao; Zhang, Heng; Zhang, Xiuchang; Zhong, Zhaoyang; Huang, Zhen; Coombs, Tim

doi:10.1109/tasc.2015.2513382

Cited by 33 publications

(16 citation statements)

References 12 publications

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“…The B-dependent critical current model was used for the COMSOL simulation, because J c can be varied in the presence of parallel and perpendicular magnetic field [15]: (8) where k = 0.186 and B 0 = 0.426 were used in (8), and J 0 is the critical current at self-field, 77 K.…”

Section: Ac Loss Calculationmentioning

confidence: 99%

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Investigation and comparison of AC losses on stabilizer-free and copper stabilizer HTS tapes

Shen

Geng

et al. 2017

Physica C: Superconductivity and its Applications

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This paper presents the measurement and simulation of Alternating Current (AC) losses on the Stabilizer-free and Copper Stabilizer High Temperature Superconducting (HTS) Tapes: SuperPower SF12100 and SCS12050. The AC loss measurement utilised electrical method to obtain overall losses with AC transport currents. The 2D H-formulation by COMSOL Multiphysics has been used to simulate the real geometry and multi-layer HTS tapes. Ferromagnetic AC losses of substrate have been assumed to be ignored as the substrates of SF12100 and SCS12050 are non-magnetic. Hysteresis AC losses in the superconducting layer, and eddy-current AC losses in copper stabilizer, silver overlayer and substrate were concerned in this investigation. The measured AC losses were compared to the AC losses from simulation, with 3 cases of different AC frequency 10, 100, and 1000 Hz. The eddy-current AC losses of copper stabilizer at frequency 1000 Hz were determined from both experiment and simulation. The estimation of AC losses with frequency at 10000 Hz was also carried out using simulation method. Finally, the frequency dependence of AC losses from Stabilizer-free Tape and Copper Stabilizer Tape were compared and analysed.

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Section: Ac Loss Calculationmentioning

confidence: 99%

“…Pointwise or Global constraint from general PDE Physics enabled transport current to be applied into the HTS tape [15]. The integration of current density J over the superconducting domain Ω equals to the magnitude of the transport current I t :…”

Section: Ac Loss Calculationmentioning

confidence: 99%

Investigation and comparison of AC losses on stabilizer-free and copper stabilizer HTS tapes

Shen

Geng

et al. 2017

Physica C: Superconductivity and its Applications

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“…In our previous research [2], we have proposed a compact superconducting magnet equipped in the Lorentz Force Electrical Impedance Tomography (LFEIT), which used the Halbach array configuration for the electromagnetic magnet [2,3]. Halbach array is generally permanent magnet based due to the low cost and easy maintenance [4].…”

Section: Introductionmentioning

confidence: 99%

“…Halbach array is generally permanent magnet based due to the low cost and easy maintenance [4]. However, if Halbach magnet requires intensity more than 1 Tesla (T) which is necessary for a large-scale whole body scanner diagnostic LFEIT system, permanent magnets are not able to realise the portable functionality of LFEIT system due to their heavy weight and large geometry [2]. Therefore, the concept of superconducting Halbach Array magnet has been reasonably raised: High Temperature Superconducting (HTS) coils are placed as Halbach array configuration, which is demonstrated in Fig.…”

Section: Introductionmentioning

confidence: 99%

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Optimization study on the magnetic field of superconducting Halbach Array magnet

Shen

Geng

et al. 2017

Physica C: Superconductivity and its Applications

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This paper presents the optimization on the strength and homogeneity of magnetic field from superconducting Halbach Array magnet. Conventional Halbach Array uses a special arrangement of permanent magnets which can generate homogeneous magnetic field. Superconducting Halbach Array utilizes High Temperature Superconductor (HTS) to construct an electromagnet to work below its critical temperature, which performs equivalently to the permanent magnet based Halbach Array. The simulations of superconducting Halbach Array were carried out using H-formulation based on Bdependent critical current density and bulk approximation, with the FEM platform COMSOL Multiphysics. The optimization focused on the coils' location, as well as the geometry and numbers of coils on the premise of maintaining the total amount of superconductor. Results show Halbach Array configuration based superconducting magnet is able to generate the magnetic field with intensity over 1 Tesla and improved homogeneity using proper optimization methods. Mathematical relation of these optimization parameters with the intensity and homogeneity of magnetic field was developed.

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Optimization of the Superconducting Halbach Array

Shen

2020

Springer Theses

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Design of a Superconducting Magnet for Lorentz Force Electrical Impedance Tomography

Cited by 33 publications

References 12 publications

Investigation and comparison of AC losses on stabilizer-free and copper stabilizer HTS tapes

Investigation and comparison of AC losses on stabilizer-free and copper stabilizer HTS tapes

Optimization study on the magnetic field of superconducting Halbach Array magnet

Optimization of the Superconducting Halbach Array

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