Quench Protection Design of an 8-T Magnet Built With Low- and High-Temperature Superconducting Coils

Li, Yang; Wang, Qiuliang; Chen, Shunzhong; Lei, Yutian; Dai, Yinming; Zhang, Ni; Hu, Xinning

doi:10.1109/tasc.2012.2198646

Cited by 9 publications

(3 citation statements)

References 15 publications

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“…This can affect the heating efficiency and distribution of heat along the rail, and must be carefully considered during the optimisation process. Another important parameter is the geometry of the coil and rail [26][27][28][29]. Some possible coil geometry options are as follows:…”

Section: Parameter Analysismentioning

confidence: 99%

Optimisation Design of a Low-Frequency Eddy Current Rail Heater

Canova,

Tartaglia,

Quercio

2023

Energies

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The aim of the work is the optimisation of a rail heater, constituted by a magnetic core supplied by a sinusoidal current, which induces an eddy current in the rail. Optimisation parameters are electrical and geometrical quantities: supply frequency, voltage amplitude, airgaps, and core shape, while objectives are power transferred to the rail, absorbed current, and power distribution index. Optimisation is performed by an accurate field analysis, provided by the finite element method (FEM), coupled to an automated multiobjective procedure based on fuzzy logic. Particular care has been devoted to the FEM model in order to take into account important phenomena as non-linearity magnetic behaviour and non-uniform distribution of current in the rail caused by eddy currents.

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Section: Parameter Analysismentioning

confidence: 99%

Optimisation Design of a Low-Frequency Eddy Current Rail Heater

Canova,

Tartaglia,

Quercio

2023

Energies

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“…More numerical or experimental investigations on NI with this Bi2223 HT-NX wire are still required to find out, like the key parameter R ct that may vary with respect to pressure, surface roughness, wire thickness tolerance, etc [57], field stabilization time for magnet ramp-up, and current redistribution in terms of hoop stress. But using the NI technique is a good way to reduce the risk of the burning-out situation, especially when a local resistive voltage is detected and the reaction time required for the fast ramp-down of an HTS magnet with insulated wire is limited to only a few seconds [58].…”

Section: Ni Techniquementioning

confidence: 99%

Key designs of a short-bore and cryogen-free high temperature superconducting magnet system for 14 T whole-body MRI

Roell

2021

Supercond. Sci. Technol.

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A 14 T whole-body magnetic resonance imaging (MRI) magnet is designed with Bi2223 high temperature superconducting (HTS) wire. Owing to the large critical current and large critical tensile strength of the wire type HT-NX at ultra-high field, the magnet is optimized in a compact shape with length of 1.9 m and outer diameter of 1.3 m. It is in the form of stacked double pancakes (DPs) with total wire consumption of 455 km. The DPs with various inner and outer radii enable the electromagnetic design to obtain highly homogeneous field of 1.5 ppm over 400 mm diameter of spherical volume (DSV). Hoopstress by winding process, thermal contraction and Lorenz force is calculated and below the wire strength specification. Considerable reduction of screening current effect in MRI magnet application is proved by a calculation example. Field homogeneity as it is influenced by various systematic tolerances and random geometric tolerances is numerically estimated, for further design optimization and design of shimming system. Iron room for passive shielding with dimension of 5 × 5 × 10 m is found to be with wall thickness of around 30 cm to effectively contain the 5-Gauss field to the wall surface. Cooling strategy for cryogen-free technique is proposed and the magnet coils temperature is calculated as below 8 K based on the estimation of joint Ohmic heating power of 1.0 W. Quench protection adopts circuit subdivision and dumping resistors to restrict the maximum voltage below 1.9 kV. No-insulation technique for the quench protection is also discussed. Some other wire candidates like REBCO and Nb3Sn for development of such ultra-high field MRI magnets are commented.

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“…When the left halves of both the inner and outer coils are quenched, the identical-direction force makes the resultant force largest, reaching −340.7 kN. A symmetric quench protection scheme with left and right DPs quenching simultaneously is necessary for mechanical balance [37].…”

Section: Unbalanced Electromagnetic Force After Quenchingmentioning

confidence: 99%

Insert magnet and shim coils design for a 27 T nuclear magnetic resonance spectrometer with hybrid high and low temperature superconductors

Wang¹,

Wang²,

Liu³

et al. 2020

Supercond. Sci. Technol.

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Extremely-high field nuclear magnetic resonance (NMR) spectrometer has the potential to significantly augment the resolution and sensitivity of the atomic resonance spectrum, which will largely boost the development of a range of scientific areas. The success of the extremely-high field NMR spectrometer depends on the development of superconducting magnet system to a great extent. A high-temperature superconducting (HTS) insert magnet and low-temperature superconducting (LTS) shim coils design scheme for a 27 T NMR spectrometer was proposed in this work. A LTS background magnet was used to generate a 15 T magnetic field in the central area and the designed HTS insert magnet was to contribute the remaining 12 T magnetic field. The HTS insert magnet adopted notch double-pancake (DP) optimization to improve the rough magnetic field distribution in the central area to a highly-homogeneous level, and shim compensation schemes was proposed for the hybrid magnet to eliminate the inhomogeneous magnetic field components in the practical fabrication. The HTS insert magnet design had a current margin 45.64% in terms of the perpendicular magnetic field intensity and the maximum hoop stress was reduced to 260 MPa with binding. There were totally 8 shim coils, including 2 Nb3Sn zonal coils located between the insert magnet and the background magnet and 6 NbTi tesseral coils placed outside the background magnet. The magnet system will be fabricated in the near future.

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Quench Protection Design of an 8-T Magnet Built With Low- and High-Temperature Superconducting Coils

Cited by 9 publications

References 15 publications

Optimisation Design of a Low-Frequency Eddy Current Rail Heater

Optimisation Design of a Low-Frequency Eddy Current Rail Heater

Key designs of a short-bore and cryogen-free high temperature superconducting magnet system for 14 T whole-body MRI

Insert magnet and shim coils design for a 27 T nuclear magnetic resonance spectrometer with hybrid high and low temperature superconductors

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