Numerical Modelling of AC Hysteresis Losses in HTS Tubes

Escamez, Guillaume; Badel, Arnaud; Tixador, Pascal; Ramdane, Brahim; Meunier, G.; Allais, A.; Bruzek, Christian-Éric

doi:10.1109/tasc.2014.2387116

Cited by 9 publications

(6 citation statements)

References 14 publications

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“…In this study, it employs the H-formulation as the governing equation of the FEM model, which is an effective numerical approach to simulate the electromagnetic behaviors of HTS 28,30,31,[35][36][37] . The governing Eq.…”

Section: B Fem Model Based On H-formulationmentioning

confidence: 99%

“…8 shows the distribution of the radial current density and azimuthal current in the ramping process, which determines the distribution of the turn-to-turn loss energy. Additionally, the distribution of the radial current depends on the turn's electromagnetic coupling with others [28,30]. The magnetization loss energy Qsc in middle part of the coil is much higher than that near the inner and outer sections of the coil.…”

Section: A Turn-to-turn and Magnetization Lossmentioning

confidence: 99%

“…The total loss generated in the ramping process is an important issue for superconducting coils and magnets, which needs to be precisely studied to predict and reduce the refrigeration requirements of applications [22][23][24][25][26][27] . For the conventionally insulated HTS coils, a magnetization loss are generated because of flux creep and flux jump in superconductors during the ramping operation, which is the main part of the traditional AC loss 24,[28][29][30][31] . For the NI HTS coils, an extra Joule loss is generated across the turn-to-turn contacts by the radial current besides the conventional magnetization loss in superconductors, which is called "turn-to-turn loss" in this study.…”

Section: Introductionmentioning

confidence: 99%

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Ramping turn-to-turn loss and magnetization loss of a No-Insulation (RE)Ba2Cu3Ox high temperature superconductor pancake coil

Wang

Song

Yuan

et al. 2017

Journal of Applied Physics

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This paper is to study ramping turn-to-turn loss and magnetization loss of a no-insulation (NI) high temperature superconductor (HTS) pancake coil wound with (RE)Ba2Cu3Ox (REBCO) conductors. For insulated (INS) HTS coils, a magnetization loss occurs on superconducting layers during a ramping operation. For the NI HTS coil, additional loss is generated by the 'bypassing' current on the turn-to-turn metallic contacts, which is called "turn-toturn loss" in this study. Therefore, the NI coil's ramping loss is much different from that of the INS coil, but few studies have been reported on this aspect. To analyze the ramping losses of NI coils, a numerical method is developed by coupling an equivalent circuit network model and a H-formulation finite element method (FEM) model. The former model is to calculate NI coil's current distribution and turn-to-turn loss, the latter model is to calculate the magnetization loss. A test NI pancake coil is wound with REBCO tapes and the reliability of this model is validated by experiments. Then the characteristics of the NI coil's ramping losses are studied using this coupling model. Results show that the turn-to-turn loss is much higher than the magnetization loss. The NI coil's total ramping loss is much higher than that of its insulated counterpart, which has to be considered carefully in the design and operation of NI applications. This paper also discusses the possibility to reduce NI coil's ramping loss by decreasing the ramping rate of power supply or increasing the coil's turn-to-turn resistivity.

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Section: B Fem Model Based On H-formulationmentioning

confidence: 99%

Section: A Turn-to-turn and Magnetization Lossmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Ramping turn-to-turn loss and magnetization loss of a No-Insulation (RE)Ba2Cu3Ox high temperature superconductor pancake coil

Wang

Song

Yuan

et al. 2017

Journal of Applied Physics

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“…The numerical technique chosen to discretize the model was the finite element method (FEM), implemented in a inhouse code developed in Polytechnique Montreal and called Daryl-Maxwell. The formulation used in this FEM code is the H-formulation, often discussed in applied superconductivity literature, for instance in [20][21][22]. The strong form behind the H-formulation in 3D is…”

Section: Description Of the Modelmentioning

confidence: 99%

Experimental characterization of the constitutive materials of MgB₂multi-filamentary wires for the development of 3D numerical models

Escamez¹,

Sirois²,

Tousignant³

et al. 2017

Supercond. Sci. Technol.

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Today MgB2 superconducting wires can be manufactured in long lengths at low cost, which makes this material a good candidate for large scale applications. However, because of its relatively low critical temperature (less than 40 K), it is necessary to operate MgB2 devices in a liquid or gaseous helium environment. In this context, losses in the cryogenic environment must be rigorously minimized, otherwise the use of a superconductor is not worthy. An accurate estimation of the losses at the design stage is therefore mandatory in order to allow determining the device architecture that minimizes the losses. In this paper, we present a complete a 3D finite element model of a 36-filament MgB2 wire based on the architecture of the Italian manufacturer Colombus. In order for the model to be as accurate as possible, we made a substantial effort to characterize all constitutive materials of the wire, namely the E–J characteristics of the MgB2 filaments and the electric and magnetic properties (B−H curves) of nickel and monel, which are the two major non-superconducting components of the wire. All properties were characterized as a function of temperature and magnetic field. Limitations of the characterization and of the model are discussed, in particular the difficulty to extract the maximum relative permeability of nickel and monel from the experimental data, as well as the lack of a thin conductive layer model in the 3D finite element method, which prevents us from taking into account the resistive barriers around the MgB2 filaments in the matrix. Two examples of numerical simulations are provided to illustrate the capabilities of the model in its current state.

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“…In the charging process, the ramping loss of the NI coil mainly includes two parts: the magnetization loss induced by flux creep in the superconducting layer [23][24][25][26][27] and contact loss generated by radial current between turns [28]. For large-scale NI magnets, the ramping process of the power supply current is usually interrupted several times because of the temperature rise induced by ramping loss [29].…”

Section: Introductionmentioning

confidence: 99%

Ramping loss and mechanical response in a no-insulation high-temperature superconducting layer-wound coil and intra-layers no-insulation coil

Liu

Yong

2021

Sci. China Technol. Sci.

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The layer-wound coil has a great potential in nuclear magnetic resonance and magnetic resonance imaging owing to the better spatial homogeneity of the magnetic field. However, high-temperature superconducting (HTS) coil wound by no-insulation (NI) layer-wound technique has been verified with a long field delay time. A new method named the intra-layer no-insulation (LNI) winding technique has been proposed to reduce the charging delay time of the coil. This paper is mainly to study and compare the ramping loss and mechanical characteristics of the layer-wound coil and LNI coil. The results indicate that the total ramping loss can be significantly reduced by using the LNI winding method. The effects of the ramping rate of power supply current and the contact resistivity on the ramping loss are also discussed in the paper. Furthermore, the stress distributions in the layer-wound coil and LNI coil are compared, where the cooling process and Lorentz force are both considered. It can be found that the copper sheet of the LNI coil experiences relatively higher stress than its (RE)Ba 2 Cu 3 O x (REBCO) conductor layer. Meanwhile, the magnitude of stress generated in the REBCO conductor of the LNI coil is slightly different from that of the layer-wound coil.

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Numerical Modelling of AC Hysteresis Losses in HTS Tubes

Cited by 9 publications

References 14 publications

Ramping turn-to-turn loss and magnetization loss of a No-Insulation (RE)Ba2Cu3Ox high temperature superconductor pancake coil

Ramping turn-to-turn loss and magnetization loss of a No-Insulation (RE)Ba2Cu3Ox high temperature superconductor pancake coil

Experimental characterization of the constitutive materials of MgB₂multi-filamentary wires for the development of 3D numerical models

Ramping loss and mechanical response in a no-insulation high-temperature superconducting layer-wound coil and intra-layers no-insulation coil

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Numerical Modelling of AC Hysteresis Losses in HTS Tubes

Cited by 9 publications

References 14 publications

Ramping turn-to-turn loss and magnetization loss of a No-Insulation (RE)Ba2Cu3Ox high temperature superconductor pancake coil

Ramping turn-to-turn loss and magnetization loss of a No-Insulation (RE)Ba2Cu3Ox high temperature superconductor pancake coil

Experimental characterization of the constitutive materials of MgB2multi-filamentary wires for the development of 3D numerical models

Ramping loss and mechanical response in a no-insulation high-temperature superconducting layer-wound coil and intra-layers no-insulation coil

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Product

Resources

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Experimental characterization of the constitutive materials of MgB₂multi-filamentary wires for the development of 3D numerical models