Models of the Resistive Contact Distribution in Superconducting ITER CICC Full-Size Joints and Terminations

Bellina, F.; Manfreda, G.

doi:10.1109/tasc.2014.2361620

Cited by 4 publications

(3 citation statements)

References 15 publications

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“…In a CICC, the strands geometry and therefore the pattern of their interstrand contacts, depend on the initial angular position (phase) of each cable bundle in the cable cross-section. These angular phases can be considered as a random array Θ Θ Θ that affects the measurements [11]. For both the contact resistance models, the parameters were determined with a statistical approach, considering a cable created with a random Θ Θ Θ array.…”

Section: Contact Resistances Analysismentioning

confidence: 99%

Numerical Investigation on Induced Current Distribution and AC Losses in a Prototype Cable for the European DEMO TF Coils

Stacchi

Bellina

Breschi

et al. 2019

IEEE Trans. Appl. Supercond.

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A new geometrical model has been implemented in the THELMA code, aiming at permitting the study of multi-stage, forced-flow cable-in-conduit conductors with rectangular crosssection, like that proposed for the TF magnets of the future fusion reactor DEMO. This model gives verisimilar strands trajectories which should enable the adoption of a more detailed interstrand electrical contact model. The paper shows the results of the first application of these code new features to a set of contact resistance and AC losses experiments carried out by Twente University on a DEMO TF prototype conductor. The results of this analysis present some unforeseen aspects that need further work to be fully understood, to improve and validate the model.

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Section: Contact Resistances Analysismentioning

confidence: 99%

Numerical Investigation on Induced Current Distribution and AC Losses in a Prototype Cable for the European DEMO TF Coils

Stacchi

Bellina

Breschi

et al. 2019

IEEE Trans. Appl. Supercond.

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“…More details on the numerical methods used for this estimation are given in [6], [13]. A comparison between the measured resistances at 10 000 load cycles and the average value of the computed ones for each cabling stage is presented in Fig.…”

Section: E Contact Resistances Calibrationmentioning

confidence: 99%

Coupled Thermal and Electromagnetic Analysis of the NAFASSY Magnet

Manfreda

Bellina

Corato

et al. 2015

IEEE Trans. Appl. Supercond.

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The paper presents an analysis of the current distribution and electromagnetic losses in the NAFASSY magnet carried out with the THELMA code, thanks to a brand-new thermal module coupled with the pre-existing electromagnetic module. The non-linear thermal and electrical properties of both superconducting and copper strands, depending on the local temperature, current density and magnetic field, are taken into account. The model analyses a single turn of the magnet, located in the highest field zone, focusing on the current distribution in the cable, the coupling AC and DC losses during ramped waveforms. The results are then extrapolated to estimate the behaviour of the overall magnet. A description of the models is given, together with a parametric analysis of different boundary conditions and cable discretizations. The analysis shows that, in nominal working conditions, no thermal instability should take place. However, local current redistribution among the strands may occur, mainly driven by the interstrand contact pattern, the local magnetic field and the strand current density.

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“…Critical to the efficacy of JackPot-AC/DC simulations are precise input parameters, with an emphasis on contact resistivities. Comparing to the estimation of averaged contact resistances between small strand bundles in the joint [17,18], for the first time, measurements of the inter-strand contact resistances from different cable stages and AC loss of a full-size ITER joint (PFJEU6) were conducted at the University of Twente [7,12]. In this study, an enhanced parameterization is employed to derive precise resistivity and solder-related parameters for a comprehensive understanding of the full-size ITER joint.…”

Section: Introductionmentioning

confidence: 99%

Quantitative analysis of ITER Poloidal Field joints through rigorous resistivity parameterization

Huang,

Ilyin,

Zhai

et al. 2024

Supercond. Sci. Technol.

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The lap-type twin-box joints are integral components in ITER fusion magnets, with profound implications for magnet stability based on their electro-magnetic, thermal, and mechanical properties. Throughout the extensive R&D process, rigorous qualification tests are conducted to meet stringent standards. However, existing tests often prioritize global performance, which lack of strand-level details due to inherent limitations in test setups. Furthermore, as the referencing test facility of SULTAN falls short in replicating relevant ITER operating conditions, numerical methods that offer both accuracy and the requisite level of detail for comprehensive magnet and component analysis and development are necessary.This paper introduces the utilization of the JackPot-AC/DC code, developed at the University of Twente, as a fundamental tool for achieving strand-level precision in handling CICCs and joints, which encompasses copper and solder components. The primary focus of this study is to obtain precise input parameters, emphasizing their role in conducting a quantitative analysis using JackPot-AC/DC. The investigation centers on an ITER PF5 joint (PFJEU6), where contact resistances and AC losses were measured under parallel magnetic fields. Given the constraints in the measured results, an enhanced parameterization is performed to derive precise resistivity and solder-related parameters. Additionally, sensitivity analyses of individual parameters and cable compact configurations are thoughtfully evaluated. With the optimal input parameters acquired, systematic simulations of the joint exposed to transverse magnetic fields, mimicking SULTAN and ITER operating conditions, are processed and validated against experimental results. This research establishes a comprehensive foundation for the analysis of lap-type twin-box joints, including DC, AC, and stability properties. The outcomes will significantly contribute to advancing the understanding of the intricate behavior of these joints in the context of fusion magnet applications.

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Models of the Resistive Contact Distribution in Superconducting ITER CICC Full-Size Joints and Terminations

Cited by 4 publications

References 15 publications

Numerical Investigation on Induced Current Distribution and AC Losses in a Prototype Cable for the European DEMO TF Coils

Numerical Investigation on Induced Current Distribution and AC Losses in a Prototype Cable for the European DEMO TF Coils

Coupled Thermal and Electromagnetic Analysis of the NAFASSY Magnet

Quantitative analysis of ITER Poloidal Field joints through rigorous resistivity parameterization

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