$I_{\rm c}$– $B$–$T$ Evaluation for High-$T_{\rm c}$ Superconductors in Pressurized/Depressurized Liquid Nitrogen

Nishijima, G.; Tsuchiya, Y.; Kitaguchi, Hitoshi; Nishimura, Tatsuo; Kato, Takeshi

doi:10.1109/tasc.2012.2234195

Cited by 7 publications

(2 citation statements)

References 8 publications

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“…The n calculation has consequences in the model of the superconducting behavior. In the present work, the n values are similar to the ones found in literature [24]. …”

Section: N Calculation For the Power Lawsupporting

confidence: 91%

REBCO tape performance under high magnetic field

Benkel

Miyoshi

Chaud

et al. 2017

Eur. Phys. J. Appl. Phys.

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Abstract. New improvements in high temperature superconductors (HTS) make them a promising candidate for building the next generation of high field magnets. As the conductors became recently available in long length, new projects such as NOUGAT (new magnet generation to generate Tesla at low cost) were started. This project aims at designing and building an HTS magnet prototype generating 10 T inside a 20 T resistive magnet. In this configuration, severe mechanical stress is applied on the insert and its extremities are subject to a high transverse component of the field. Because the conductor has anisotropic properties, it has to be studied carefully under similar conditions as the final prototype. First, this paper presents both the NOUGAT project and its context. Then, it shows the experimental results on short HTS tapes studied under high magnetic field up to 23 T with varying orientation. These results allow validating the current margin of the prototype. Finally, a first wound prototype is presented with experimental results up to 200 A under 16 T.

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“…The n calculation has consequences in the model of the superconducting behavior. In the present work, the n values are similar to the ones found in literature [24]. …”

Section: N Calculation For the Power Lawsupporting

confidence: 91%

REBCO tape performance under high magnetic field

Benkel

Miyoshi

Chaud

et al. 2017

Eur. Phys. J. Appl. Phys.

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“…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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Transport critical current measurement apparatus using liquid nitrogen cooled high-Tc superconducting magnet with variable temperature insert

Nishijima

Kitaguchi

Tshuchiya

et al. 2013

Review of Scientific Instruments

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We have developed an apparatus to investigate transport critical current (I(c)) as a function of magnetic field and temperature using only liquid nitrogen. The apparatus consists of a (Bi,Pb)(2)Sr(2)Ca(2)Cu(3)O(10) (Bi-2223) superconducting magnet, an outer dewar, and a variable temperature insert (VTI). The magnet, which is operated in depressurized liquid nitrogen, generates magnetic field up to 1.26 T. The sample is also immersed in liquid nitrogen. The pressure in the VTI is controlled from 0.02 to 0.3 MPa, which corresponds to temperature ranging from 66 to 88 K. We have confirmed the long-term stable operation of the Bi-2223 magnet at 1 T. The temperature stability of the sample at high transport current was also demonstrated. The apparatus provides easy-operating I(c) measurement environment for a high-T(c) superconductor up to 500 A in magnetic fields up to 1 T and in temperatures ranging from 66 to 88 K.

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$I_{\rm c}$– $B$–$T$ Evaluation for High-$T_{\rm c}$ Superconductors in Pressurized/Depressurized Liquid Nitrogen

Cited by 7 publications

References 8 publications

REBCO tape performance under high magnetic field

REBCO tape performance under high magnetic field

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

Transport critical current measurement apparatus using liquid nitrogen cooled high-Tc superconducting magnet with variable temperature insert

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