Mechanical Properties and Strain-Induced Filament Degradation of Ex Situ and In Situ MgB<sub>2</sub>Wires

Alknes, P.; Hagner, Matthias; Bjoerstad, R.; Scheuerlein, C.; Bordini, B.; Sugano, M.; Hudspeth, Jessica; Ballarino, A.

doi:10.1109/tasc.2015.2509166

Cited by 19 publications

(15 citation statements)

References 12 publications

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“…The single-crystal like diffraction patterns of ReBCO in CC tapes require more sophisticated analysis. The acquisition of MgB 2 diffraction peaks in PIT wires is also more challenging [26,27].…”

Section: Discussionmentioning

confidence: 99%

Comparison of Electromechanical Properties and Lattice Distortions of Different Cuprate High-Temperature Superconductors

Scheuerlein

Bjoerstad

Grether

et al. 2016

IEEE Trans. Appl. Supercond.

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Section: Discussionmentioning

confidence: 99%

Comparison of Electromechanical Properties and Lattice Distortions of Different Cuprate High-Temperature Superconductors

Scheuerlein

Bjoerstad

Grether

et al. 2016

IEEE Trans. Appl. Supercond.

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“…In addition, the aluminum thermal shield, covered again by 30 layers of MLI, is supported with similar tie rods ( =6mm) connecting to the cryostat. The mechanical structure for both magnets limits coil deformation to a 1 mm displacement and reduces mechanical strain on single conductors to below the 0.2% threshold at which the superconductor critical current starts to degrade [10].…”

Section: Thermo-mechanical Structurementioning

confidence: 99%

Energy saving magnets for beam lines

Rossi,

Mariotto,

Sorti

2024

J. Phys.: Conf. Ser.

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Beam lines magnets for high rigidity particles can have a large power dissipation. In presence of a high duty cycle, this translates in a considerable amount of energy waste. The call for sustainability of large research infrastructures, like particle accelerator centers, and the recent increase of the cost of energy, require to take measures to reduce the energy consumption, even at cost of moderate investment. A study program called ESABLIM (Energy SAving Beam LIne Magnets) has been set up at the LASA lab of University and INFN Milano, aimed at revamping existing normal-conducting magnets for beam lines with the target of cutting the peak power by a factor 10 to 20 and reducing the energy consumption by factor 5 or more. The idea is to replace the water cooled coils of iron-dominated magnets with new superconducting coils cooled at 10-20 K by means of a cryocooler, while to reusing the iron yoke pole assembly. We envisage using MgB2 for its moderate cost, however, high temperature superconductors (HTS) will also be considered as conductor. We present the first advanced design for revamping of a large bending dipole in a hadron therapy center, and the conceptual design for magnets in a nuclear physics laboratory and we try to define the domain where this transformation of normal-conducting into super-ferric magnets can be technically and economically advantageous.

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“…Three types of filamentary MgB 2 wires have been chosen for the tensile load and unloading tests: (i) 37 filament wire made by a standard ex situ PIT technique, manufactured by Columbus Superconductors [14,15], named EX-37, (ii) 30 filament wire manufactured by in situ PIT technique, produced by Hyper Tech Research, Inc. [12,16], named IN-30 and (iii) 19 filament wire made by the internal magnesium diffusion method, named IMD-19. Pure Mg wire (99.9%) of 3.2 mm diameter and boron powder of 99.8% purity from Pavezyum were used for the IMD-19 wire.…”

Section: The Measured Samplesmentioning

confidence: 99%

“…The set of commercial and laboratory made MgB 2 wires have been tested already by the only tensile loading of free-standing samples with simple estimation of ε irr as the strain level at which the first decrease of I c is observed [12,13]. Recently, Alknes et al [14] have compared the mechanical properties and I c degradation of 20 cm long ex situ and in situ MgB 2 wires with a Monel ® sheath, subjected to tensile load at room temperature and at 77 K. When the targeted tensile strain was achieved the load was released and the samples were placed into a sample holder for standard I c measurements at 4.2 K. In both wires the I c degradation was significantly smaller when the strain was applied at 77 K and surprisingly more meaningful for the in situ MgB 2 wire [14].…”

Section: Introductionmentioning

confidence: 99%

Filamentary MgB₂wires manufactured by different processes subjected to tensile loading and unloading

Kòváč

Kulich

Kopera

et al. 2017

Supercond. Sci. Technol.

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A reversible strain effect on the transport critical current (I c ) of filamentary MgB 2 wires manufactured by three different processes has been examined at 4.2 K and under an external field of 5 T. MgB 2 wires with a Nb barrier and a Monel ® outer sheath made by powder-in-tube ex situ, in situ and by diffusion of magnesium into the boron process, have been examined. The wire samples were loaded and partially unloaded at progressively higher strain levels to determine the irreversible strain limit (ε irr ), which is defined as the ultimate strain where the critical current (I c ) is still reversible. It was found that the strain tolerances of the tested MgB 2 wires are affected by the production process. The highest annealing temperature (>900 °C), applied in the ex situ process, causes an apparent softening of the Monel ® and, together with the poor grain connectivity of MgB 2 filaments, leads to the lowest strain tolerance (ε irr =0.20%). The best grain connectivity, in internal Mg diffusion (IMD)-made MgB 2 , combined with a stronger Monel ® sheath (heat treated at a lower temperature ∼640 °C) results in the best strain tolerance (ε irr =0.55%).

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Mechanical Properties and Strain-Induced Filament Degradation of Ex Situ and In Situ MgB₂Wires

Cited by 19 publications

References 12 publications

Comparison of Electromechanical Properties and Lattice Distortions of Different Cuprate High-Temperature Superconductors

Comparison of Electromechanical Properties and Lattice Distortions of Different Cuprate High-Temperature Superconductors

Energy saving magnets for beam lines

Filamentary MgB₂wires manufactured by different processes subjected to tensile loading and unloading

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Mechanical Properties and Strain-Induced Filament Degradation of Ex Situ and In Situ MgB2Wires

Cited by 19 publications

References 12 publications

Comparison of Electromechanical Properties and Lattice Distortions of Different Cuprate High-Temperature Superconductors

Comparison of Electromechanical Properties and Lattice Distortions of Different Cuprate High-Temperature Superconductors

Energy saving magnets for beam lines

Filamentary MgB2wires manufactured by different processes subjected to tensile loading and unloading

Contact Info

Product

Resources

About

Mechanical Properties and Strain-Induced Filament Degradation of Ex Situ and In Situ MgB₂Wires

Filamentary MgB₂wires manufactured by different processes subjected to tensile loading and unloading