Experimental and numerical analysis of quench propagation on MgB<sub>2</sub>tapes and pancake coils

Pelegrin, Jorge; Romano, G.; Martínez, Elena; Angurel, L.A.; Navarro, Rafael; Ferdeghini, C.; Brisigotti, S.; Grasso, G.; Nardelli, Davide

doi:10.1088/0953-2048/26/4/045002

Cited by 24 publications

(28 citation statements)

References 20 publications

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“…In these studies, the minimum quench energies (MQE) ranged from 10–1000 mJ and the normal zone propagation velocities (NZPV) were on the order of 1–100 cm/s. Several computational models showed good agreement with the experimental results [3-5, 7]. The effects of different wire materials and stabilizer thickness on the quench behavior were also investigated computationally [8-10].…”

Section: Introductionmentioning

confidence: 74%

Magnetic field dependent stability and quench behavior and degradation limits in conduction-cooled MgB₂wires and coils

Ye¹,

Cruciani²,

Xu³

et al. 2015

Supercond. Sci. Technol.

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Long lengths of metal/MgB2 composite conductors with high critical current density (Jc), fabricated by the power-in-tube (PIT) process, have recently become commercially available. Owing to its electromagnetic performance in the 20 K – 30 K range and relatively low cost, MgB2 may be attractive for a variety of applications. One of the key issues for magnet design is stability and quench protection, so the behavior of MgB2 wires and magnets must be understood before large systems can emerge. In this work, the stability and quench behavior of several conduction-cooled MgB2 wires are studied. Measurements of the minimum quench energy and normal zone propagation velocity are performed on short samples in a background magnetic field up to 3 T and on coils in self-field and the results are explained in terms of variations in the conductor architecture, electrical transport behavior, operating conditions (transport current and background magnetic field) and experimental setup (short sample vs small coil). Furthermore, one coil is quenched repeatedly with increasing hot-spot temperature until Jc is decreased. It is found that degradation during quenching correlates directly with temperature and not with peak voltage; a safe operating temperature limit of 260 K at the surface is identified.

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Section: Introductionmentioning

confidence: 74%

Magnetic field dependent stability and quench behavior and degradation limits in conduction-cooled MgB₂wires and coils

Ye¹,

Cruciani²,

Xu³

et al. 2015

Supercond. Sci. Technol.

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“…A small strain gage, glued to the tape surface using GE varnish [4], was used as heater, which is 3 mm long, 2 mm wide and 0.4 mm thick and has an electric resistance of 120 Ω.…”

Section: Quench Measurementsmentioning

confidence: 99%

Effects of Thermal Cycling and Thermal Stability on 2G HTS Pancake Coils

Núñez-Chico

Martínez

Angurel

et al. 2015

IEEE Trans. Appl. Supercond.

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Degradation of superconducting critical currents of 2G-HTS coils may appear upon thermal cycling due to the tensile stress differences of its elements that induce increasing tape damages. We report on the thermal cycling and thermal stability effects of round epoxy-impregnated pancake coils under two cooling conditions (liquid nitrogen and conduction cooling). Thermal stability has been analyzed by measuring the quench development and propagation. Minimum quench energy values and longitudinal and radial propagation velocities are reported. The influence of different epoxy impregnations and number of turns in the thermal cycling effects and quench behavior has been studied.

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“…The value of V l for our tape is approximately 2 or 3 orders slower than those of LTS [19,20] and V l for our tape is approximately 1 order slower than those of MgB 2 from 20 K to 30 K [21][22][23]. Values of these velocities can be seen in Fig.…”

Section: Stability Analyses Of Lts and Hts Conductors Arementioning

confidence: 72%

Quench Behaviors of Monofilament Iron-Based Sr_0.6K_0.4Fe₂As₂Tape With Ag Sheath at Different Temperatures

Liu

Zhang

Jing

et al. 2016

IEEE Trans. Appl. Supercond.

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For practical application, stability investigations of Sr0.6K0.4Fe2As2 conductors are of great importance. In this paper, quench development and propagation in Ag-sheathed are investigated experimentally and numerically. Measurements are performed as a function of transport current for several operating temperatures between 19 and 35 K. The work focuses on the evaluation of quench development, and the estimation of normal zone propagation velocity (NZPV) and minimum quench energy (MQE). The experimentally obtained temperature dependence of NZPV is compared with a simplified adiabatic model. Also, the NZPV and the MQE of the sample are compared with those of a low-temperature superconductor (LTS) and a high-temperature superconductor (HTS). According to the results, the basic quench characteristics fit between those of LTS and HTS materials.

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Experimental and numerical analysis of quench propagation on MgB₂tapes and pancake coils

Cited by 24 publications

References 20 publications

Magnetic field dependent stability and quench behavior and degradation limits in conduction-cooled MgB₂wires and coils

Magnetic field dependent stability and quench behavior and degradation limits in conduction-cooled MgB₂wires and coils

Effects of Thermal Cycling and Thermal Stability on 2G HTS Pancake Coils

Quench Behaviors of Monofilament Iron-Based Sr_0.6K_0.4Fe₂As₂Tape With Ag Sheath at Different Temperatures

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Experimental and numerical analysis of quench propagation on MgB2tapes and pancake coils

Cited by 24 publications

References 20 publications

Magnetic field dependent stability and quench behavior and degradation limits in conduction-cooled MgB2wires and coils

Magnetic field dependent stability and quench behavior and degradation limits in conduction-cooled MgB2wires and coils

Effects of Thermal Cycling and Thermal Stability on 2G HTS Pancake Coils

Quench Behaviors of Monofilament Iron-Based Sr0.6K0.4Fe2As2Tape With Ag Sheath at Different Temperatures

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Product

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Experimental and numerical analysis of quench propagation on MgB₂tapes and pancake coils

Magnetic field dependent stability and quench behavior and degradation limits in conduction-cooled MgB₂wires and coils

Magnetic field dependent stability and quench behavior and degradation limits in conduction-cooled MgB₂wires and coils

Quench Behaviors of Monofilament Iron-Based Sr_0.6K_0.4Fe₂As₂Tape With Ag Sheath at Different Temperatures