Stresses in superconducting solenoids

Arp, V.

doi:10.1063/1.323913

Cited by 78 publications

(32 citation statements)

References 6 publications

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“…A second important finding concerned a coil that was trained / strained to 0.7 % hoop strain. Arp [12], as outlined earlier, showed that fibreglass between layers would be beneficial in reducing conductor hoop stress. Training did not re-occur until the hoop strain was very close to 0.7 %.…”

Section: Resin Cracking Wax and Frictionmentioning

confidence: 81%

Instability in Super-Conducting Magnets — A Review of Heat Input from Mechanical Disturbances

Evans¹

2004

AIP Conference Proceedings

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Section: Resin Cracking Wax and Frictionmentioning

confidence: 81%

Instability in Super-Conducting Magnets — A Review of Heat Input from Mechanical Disturbances

Evans¹

2004

AIP Conference Proceedings

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“…Numerical homogenization of the wire improves the estimation by introducing an orthotropic estimation in the linear elastic range of material behavior [47]. After the numerical homogenization of the wire, the winding, cool-down, and electromagnetic charging stress are then calculated and compared to the analytical methods described by Arp [50] and Caldwell [51]. …”

Section: Mechanical Support and Stress In Coil Bundlesmentioning

confidence: 99%

Conceptual designs of conduction cooled MgB₂ magnets for 1.5 and 3.0 T full body MRI systems

Baig

Amin

Deissler

et al. 2017

Supercond. Sci. Technol.

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Conceptual designs of 1.5 and 3.0 T full-body magnetic resonance imaging (MRI) magnets using conduction cooled MgB2 superconductor are presented. The sizes, locations, and number of turns in the eight coil bundles are determined using optimization methods that minimize the amount of superconducting wire and produce magnetic fields with an inhomogeneity of less than 10 ppm over a 45 cm diameter spherical volume. MgB2 superconducting wire is assessed in terms of the transport, thermal, and mechanical properties for these magnet designs. Careful calculations of the normal zone propagation velocity and minimum quench energies provide support for the necessity of active quench protection instead of passive protection for medium temperature superconductors such as MgB2. A new ‘active’ protection scheme for medium Tc based MRI magnets is presented and simulations demonstrate that the magnet can be protected. Recent progress on persistent joints for multifilamentary MgB2 wire is presented. Finite difference calculations of the quench propagation and temperature rise during a quench conclude that active intervention is needed to reduce the temperature rise in the coil bundles and prevent damage to the superconductor. Comprehensive multiphysics and multiscale analytical and finite element analysis of the mechanical stress and strain in the MgB2 wire and epoxy for these designs are presented for the first time. From mechanical and thermal analysis of our designs we conclude there would be no damage to such a magnet during the manufacturing or operating stages, and that the magnet would survive various quench scenarios. This comprehensive set of magnet design considerations and analyses demonstrate the overall viability of 1.5 and 3.0 T MgB2 magnet designs.

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“…Plane strain approximation [9], [10] is used to analyze the stresses caused by cooldown from room temperature to cryogenic temperature, which is thought to be uniform. That is, the axial elastic strain is zero.…”

Section: B Stresses Caused By Cooldownmentioning

confidence: 99%

Preliminary Mechanical Analysis of a 9.4-T Whole-Body MRI Magnet

Cheng

Zhang

et al. 2015

IEEE Trans. Appl. Supercond.

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A 9.4-T/800-mm superconducting magnet for wholebody magnetic resonance imaging system has been designed and will be constructed from NbTi conductors. Main coils wound on five aluminum alloy formers provide the center field strength of about 9.4 T. In addition, compensation coils wound on another aluminum alloy former are used to improve the field uniformity of the imaging region. The operating point of the inner main coil is very close to the critical properties of its wire, and its temperature margin is about 0.4 K. It is necessary to know the mechanical stress in the main coils during all operating conditions. The mechanical behavior of the main coils during winding, cooldown, and energizing is analyzed. The effects on mechanical disturbances are predicted, and one available method is proposed to reduce premature quench. In addition, the dimension variations and position changes due to pretension, thermal contraction, and magnetic compression are present. Index Terms-Magnetic resonance imaging (MRI) superconducting magnet, Mechanical disturbance, mechanical stress. 1051-8223

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Stresses in superconducting solenoids

Cited by 78 publications

References 6 publications

Instability in Super-Conducting Magnets — A Review of Heat Input from Mechanical Disturbances

Instability in Super-Conducting Magnets — A Review of Heat Input from Mechanical Disturbances

Conceptual designs of conduction cooled MgB₂ magnets for 1.5 and 3.0 T full body MRI systems

Preliminary Mechanical Analysis of a 9.4-T Whole-Body MRI Magnet

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Stresses in superconducting solenoids

Cited by 78 publications

References 6 publications

Instability in Super-Conducting Magnets — A Review of Heat Input from Mechanical Disturbances

Instability in Super-Conducting Magnets — A Review of Heat Input from Mechanical Disturbances

Conceptual designs of conduction cooled MgB2 magnets for 1.5 and 3.0 T full body MRI systems

Preliminary Mechanical Analysis of a 9.4-T Whole-Body MRI Magnet

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Product

Resources

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Conceptual designs of conduction cooled MgB₂ magnets for 1.5 and 3.0 T full body MRI systems