REBCO Performance at High Field With Low Incident Angle and Preliminary Tests for a 10-T Insert

Benkel, Tara; Miyoshi, Yasuyuki; Escamez, Guillaume; Gonzales, Daniel; Chaud, X.; Badel, Arnaud; Tixador, Pascal

doi:10.1109/tasc.2016.2540158

Cited by 25 publications

(15 citation statements)

References 18 publications

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“…The conductor is 12 mm wide, consisting of ~41 μm substrate of Hastelloy C276, 2 μm HTS layer, 2 μm silver on the HTS layer and 1 μm silver on the substrate layer. The angular dependent I c (B) of 4 mm wide SuperOx tape was measured at 4.2 K [18]. Here we assume the 12 mm wide tape has the identical J c performance and fit the J c into the following equation [19] c ( )…”

Section: Finite Element Modelingmentioning

confidence: 99%

Magnetization simulation of ReBCO tape stack with a large number of layers using the ANSYS A-V-A formulation

Zhang

Hellmann

Calvi

et al. 2020

IEEE Trans. Appl. Supercond.

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In this paper we have modeled the magnetization of a disk-shaped ReBCO tape stack by using the ANSYS A-V-A formulation based iterative algorithm method developed at Paul Scherrer Institute (PSI). The tape stack consists of 400 layers of ReBCO coated conductors from SuperOx which have a tape width of 12 mm, a thickness of 46 μm and a field angle dependent critical current density J c (B). The model of the tape stack is created with real superconducting layers and substrates, without assuming a homogenized J c in the tape or assuming the superconducting layer as 1-D line in the tape (T-A formulation). The computation time is reduced by using the A-V formulation in superconducting layers and the A-formulation in non-superconducting areas. Simulation studies show that the tape stack is capable of trapping a central magnetic field of 10 T after field cooling (FC) magnetization from 10 T to zero. Further studies are carried out to investigate the possibility of trapping a central magnetic field of 20 T in a tape stack by using wider or thinner ReBCO coated conductors.

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Section: Finite Element Modelingmentioning

confidence: 99%

Magnetization simulation of ReBCO tape stack with a large number of layers using the ANSYS A-V-A formulation

Zhang

Hellmann

Calvi

et al. 2020

IEEE Trans. Appl. Supercond.

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show abstract

“…In the first scenario, the n-value of the power law varies between 20 and 50, which is a typical range of variation for HTS materials [54], while the J c (B,θ) curve does not change and is set to a reference curve, J c (B,θ) ref , corresponding to data reported in [55]. V-I curves obtained for several n-values are displayed in figure 7.…”

Section: N-value Sensitivitymentioning

confidence: 99%

Calculation of the local current density in high-temperature superconducting insulated rare earth–barium–copper oxide coils using a volume integral formulation and its contribution to coil protection

Rozier

Badel

Ramdane

et al. 2019

Supercond. Sci. Technol.

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High-temperature superconducting materials have remarkable current-carrying capabilities, even when operated under high magnetic fields. Since long rare earth-barium-copper oxide (REBCO)-coated conductors are now available (thanks to improvements in the fabrication process) this material has become an attractive option for high field magnet applications. However, such extreme operating conditions require an efficient quench protection system to prevent the coil from developing damaging hot spots, which greatly depends on the winding used. We focus here on the protection of insulated HTS coils against thermal runaways that can locally destroy the magnet. We developed a transient two-dimensional (2D) axisymmetric model using a volume integral formulation based on generalization of the partial element equivalent circuit method to compute the local current density distribution inside REBCO-insulated coils and account for local performance variations. Indeed, the most interesting property of integral methods is the requirement that only active regions are meshed, which leads to a significant reduction in the size of the problem. The formulation is introduced for general 3D cases and its adaptation to 2D axisymmetric problems is detailed. The formulation has been validated thanks to a bulk magnetization benchmark, the results of which (obtained with the finite element method) were compared with our integral formulation solution. The model has also been compared with experimental data obtained on a double pancake coil. The objective is to study the effects of magnetization on the transient voltage due to dynamic current distribution when ramping up the magnet so as to be able to determine some key parameters associated with coil protection. Such an approach is developed on a small-scale test case and the transient behaviours observed are discussed.

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“…The n-value of the Power Law is set to 25. J c variation with the magnetic field is defined using a lift factor approach (defined as the ratio between the critical current I c (T op , B, θ) measured at a given operation temperature in a given magnetic field and its value at 77 K self field) derived from SuperOx data [17]: I c (T op , B, θ) sample is the critical current map measured in [17] for several operating conditions on a 4 mm sample and I c (77 K, sf) sample = 135 A is its critical current at 77 K, self-field. The temperature dependency is derived from analytical formulas presented in [18].…”

Section: A Coil Descriptionmentioning

confidence: 99%

Modeling of Dynamic Current Distribution in REBCO Insulated Coils Using a Volume Integral Formulation for Protection Purpose

Rozier

Badel

Ramdane

et al. 2019

IEEE Trans. Appl. Supercond.

View full text Add to dashboard Cite

REBCO Performance at High Field With Low Incident Angle and Preliminary Tests for a 10-T Insert

Cited by 25 publications

References 18 publications

Magnetization simulation of ReBCO tape stack with a large number of layers using the ANSYS A-V-A formulation

Magnetization simulation of ReBCO tape stack with a large number of layers using the ANSYS A-V-A formulation

Calculation of the local current density in high-temperature superconducting insulated rare earth–barium–copper oxide coils using a volume integral formulation and its contribution to coil protection

Modeling of Dynamic Current Distribution in REBCO Insulated Coils Using a Volume Integral Formulation for Protection Purpose

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