Quench Induced Eddy Current and Mechanical Stresses in the Bobbin and Thermal Shield of the 1.5 T MRI Magnet System

Soni, Vijay; Suman, Navneet; Thekkethil, Sankar Ram; Nandawadekar, Ajit; Kumar, Rajesh; Sinha, Gautam; Gupta, Arvind; Sharma, Ridhima; Kar, Soumen

doi:10.1109/tasc.2021.3095069

Cited by 1 publication

(2 citation statements)

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“…This trend indicates that altering the thickness of the TS can only have a small effect on restraining the eddy current's magnitude and stress level. A similar conclusion has also been observed in the MRI cryostat system and has been illustrated in the [45]. In addition, peak values of the z-axis force of the TS during quench process almost increase proportionally with the thickness.…”

Section: Effect Of the Variation Of Materials And Thickness Of Thesupporting

confidence: 85%

“…Pes et al [43] calculated the eddy current and Lorentz force on the TS of a dipole magnet with an iron yoke. Suman et al [44] and Soni et al [45] performed a detailed post-quench simulation on the electro-mechanical behaviors of the bobbin and TS of an MRI magnet system. The previous studies are aimed at NbTi and Nb 3 Sn magnet-cryostat systems, where the magnets are usually wound by insulation technique.…”

Section: Introductionmentioning

confidence: 99%

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Quench analysis of a no-insulation REBCO magnet based on the ADI method considering the coupling effect of the cryostat

Zheng,

Liu,

Song

et al. 2023

Supercond. Sci. Technol.

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A no-insulation (NI) REBCO superconducting magnet is under development at Wuhan National High Magnetic Field Center, China. The magnet with the liquid helium cryostat system has a compact structure to reduce the space required for operation. During a quench, the fast-changing spatial magnetic field around the NI magnet may induce a strong eddy current in the conductive parts of the cryostat. The eddy current and its associated Lorentz force will generate mechanical stress on the cryostat, especially on the thermal shield (TS). The mechanical strength of the cryostat needs verification in the preliminary design. Furthermore, the degree to which the electromagnetic coupling between the cryostat and NI magnet might impact the quench behaviors of the NI magnet remains uncertain. In this paper, a multi-physics quench model is newly developed for the NI REBCO magnet, and the alternating direction implicit method is employed for the solver of the thermal model to improve computational efficiency. This simulation model can consider the electromagnetic coupling effect between the NI magnet and cryostat by constructing a partial element equivalent circuit. A quench analysis has been performed and we found that: (1) The cryostat can function as a secondary shorted circuit to the NI magnet and slow down the quench speed to a certain extent. (2) During the rather fast inductive quench phase, the cryostat will experience an attraction force towards the quench propagation frontier. (3) A quench propagation from one end of the magnet can cause a significant z-axis unbalanced force on the TS. (4) Cryostat materials with drastically changed electrical conductivity can significantly affect their mechanical responses during a quench. However, the eddy current density and maximum Von Mises stress on the TS are barely affected by the thickness of the TS and the contact resistance of the NI REBCO magnet.

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Section: Effect Of the Variation Of Materials And Thickness Of Thesupporting

confidence: 85%

Section: Introductionmentioning

confidence: 99%

Quench analysis of a no-insulation REBCO magnet based on the ADI method considering the coupling effect of the cryostat

Zheng,

Liu,

Song

et al. 2023

Supercond. Sci. Technol.

View full text Add to dashboard Cite

show abstract

Quench Induced Eddy Current and Mechanical Stresses in the Bobbin and Thermal Shield of the 1.5 T MRI Magnet System

Cited by 1 publication

References 13 publications

Quench analysis of a no-insulation REBCO magnet based on the ADI method considering the coupling effect of the cryostat

Quench analysis of a no-insulation REBCO magnet based on the ADI method considering the coupling effect of the cryostat

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