Coupled Thermal and Electromagnetic Analysis of the NAFASSY Magnet

Manfreda, G.; Bellina, F.; Corato, V.; Corte, A. della; Ribani, P.L.

doi:10.1109/tasc.2014.2368251

Cited by 3 publications

(3 citation statements)

References 18 publications

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“…This model was initially developed, in cooperation with the Polytechnic University of Turin and the University of Udine, for the coupled thermal-hydraulic (TH) and electromagnetic (EM) analysis of superconductor cables subject to transport current and applied field in the frame of an EFDA initiative aimed at the analysis of fusion systems [28]. The electromagnetic module of the model, developed by the University of Bologna and used in this research [25,26], has been successfully used in a variety of problems involving different materials and architectures, including cable-in-conduit conductor (CICC) [29,30], Rutherford cables [31] and multi-filamentary wires [32]. The main features of the THELMA model are described in this Section.…”

Section: Calculation Model and Simulated Casesmentioning

confidence: 99%

Calculation of AC Losses in a 500 kJ/200 kW Multifilamentary MgB2 SMES Coil

et al. 2023

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SMES technology based on MgB2 superconductor and cryogenic-free cooling can offer a viable solution to power-intensive storage in the short term. One of the main obstacles to the development of dry-cooled SMES systems is the heat load removal due to the AC loss of the superconductor during fast charging and discharging cycles at high power. Accurate knowledge of the amount and distribution of AC loss in the coil is of paramount importance for the sizing and the design of the cooling system and for assessing the possible operational limits of the technology. In this manuscript, the AC loss of a 500 kJ/200 kW multifilamentary MgB2 SMES during charge–discharge cycling at full power is numerically investigated. The methodology and assumptions of the calculation are briefly resumed, and numerical results are reported and discussed in detail. In particular, the time profile and the distribution of the dissipated power all over the coil are reported. An average dissipation of 85.5 mW/m is found all over the coil during one charge–discharge cycle at full power, with a peak of 150.1 mW/m in the turns lying at the ends of the coil.

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Section: Calculation Model and Simulated Casesmentioning

confidence: 99%

Calculation of AC Losses in a 500 kJ/200 kW Multifilamentary MgB2 SMES Coil

et al. 2023

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“…To this purpose, a new geometrical model for the Rutherford cable was implemented. Coupled with the new thermal model recently developed to predict the performances of NAFASSY magnet conductor [2], this feature permits the electromagnetic-thermal analysis of segments of Rutherford cable in magnetic field in transient regime.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the quench propagation along Nb3Sn Rutherford cables with the THELMA code. Part II: Model predictions and comparison with experimental results

et al. 2016

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a b s t r a c tTo improve the technology of the new generation of accelerator magnets, prototypes are being manufactured and tested in several laboratories. In parallel, many numerical analyses are being carried out to predict the magnets behaviour and interpret the experimental results. This paper focuses on the quench propagation velocity, which is a crucial parameter as regards the energy dissipation along the magnet conductor. The THELMA code, originally developed for cable-in-conduit conductors for fusion magnets, has been used to study such quench propagation. To this purpose, new code modules have been added to describe the Rutherford cable geometry, the material non-linear thermal properties and to describe the thermal conduction problem in transient regime. THELMA can describe the Rutherford cable at the strand level, modelling both the electrical and thermal contact resistances between strands and enabling the analysis of the effects of local hot spots and quench heaters. This paper describes the model application to a sample of Short Model Coil tested at CERN: a comparison is made between the experimental results and the model prediction, showing a good agreement. A comparison is also made with the prediction of the most common analytical models, which give large inaccuracies when dealing with low n-index cables like Nb 3 Sn cables.

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“…This model has already been used for a predictive analysis of the NAFASSY magnet, a large-bore magnet with a field up to 6.7 T, to be employed for the test of superconducting devices and cables, suitable for applications to controlled thermonuclear fusion reactors and accelerators [15]. To this purpose, new code modules have been added, to describe the material non-linear thermal properties and to model the thermal conduction in transient regime in terms of a non-linear lumped network.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the quench propagation along Nb3Sn Rutherford cables with the THELMA code. Part I: Geometric and thermal models

Manfreda

Bellina

2016

Cryogenics

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a b s t r a c tThe paper describes the new lumped thermal model recently implemented in THELMA code for the coupled electromagnetic-thermal analysis of superconducting cables. A new geometrical model is also presented, which describes the Rutherford cables used for the accelerator magnets. A first validation of these models has been given by the analysis of the quench longitudinal propagation velocity in the Nb 3 Sn prototype coil SMC3, built and tested in the frame of the EUCARD project for the development of high field magnets for LHC machine. This paper shows in detail the models, while their application to the quench propagation analysis is presented in a companion paper.

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Coupled Thermal and Electromagnetic Analysis of the NAFASSY Magnet

Cited by 3 publications

References 18 publications

Calculation of AC Losses in a 500 kJ/200 kW Multifilamentary MgB2 SMES Coil

Calculation of AC Losses in a 500 kJ/200 kW Multifilamentary MgB2 SMES Coil

Analysis of the quench propagation along Nb3Sn Rutherford cables with the THELMA code. Part II: Model predictions and comparison with experimental results

Analysis of the quench propagation along Nb3Sn Rutherford cables with the THELMA code. Part I: Geometric and thermal models

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