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CERN Document Server 10 записей найдено  Поиск длился 0.65 секунд. 
1.
Reduced Order Hysteretic Magnetization Model for Composite Superconductors / Dular, Julien (CERN) ; Verweij, Arjan (CERN) ; Wozniak, Mariusz (CERN)
In this paper, we propose the Reduced Order Hysteretic Magnetization (ROHM) model to describe the magnetization and instantaneous power loss of composite superconductors subject to time-varying magnetic fields. [...]
arXiv:2409.13653. - 20.
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2.
Helicoidal Transformation Method for Finite Element Models of Twisted Superconductors / Dular, Julien (CERN) ; Henrotte, François (Liege U.) ; Nicolet, André (Aix-Marseille U.) ; Wozniak, Mariusz (CERN) ; Vanderheyden, Benoît (Liege U.) ; Geuzaine, Christophe (Liege U.)
This article deals with the modeling of superconducting and resistive wires with a helicoidal symmetry, subjected to an external field and a transport current. Helicoidal structures are 3-D, and therefore yield computationally intensive simulations in a Cartesian coordinate system. [...]
2024 - 15 p. - Published in : IEEE Trans. Appl. Supercond. 34 (2024) 8200615 Fulltext: PDF;
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3.
Coupled Axial and Transverse Currents Method for Finite Element Modelling of Periodic Superconductors / Dular, Julien (CERN) ; Magnus, Fredrik (CERN ; Norwegian U. Sci. Tech.) ; Schnaubelt, Erik (CERN ; Darmstadt, Tech. Hochsch.) ; Verweij, Arjan (CERN) ; Wozniak, Mariusz (CERN)
In this paper, we propose the Coupled Axial and Transverse currents (I) (CATI) method, as an efficient and accurate finite element approach for modelling the electric and magnetic behavior of periodic composite superconducting conductors. The method consists of a pair of two-dimensional models coupled via circuit equations to account for the conductor geometrical periodicity. [...]
arXiv:2404.09775.- 2024-07-29 - 18 p. - Published in : Supercond. Sci. Technol. 37 (2024) 095002 Fulltext: 2404.09775 - PDF; document - PDF;
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4.
Parallel-in-Time Integration of Transient Phenomena in No-Insulation Superconducting Coils Using Parareal / Schnaubelt, Erik (CERN ; Darmstadt, Tech. U.) ; Wozniak, Mariusz (CERN) ; Dular, Julien (CERN) ; Cortes Garcia, Idoia (Eindhoven, Tech. U.) ; Verweij, Arjan (CERN) ; Schöps, Sebastian (Darmstadt, Tech. U.)
High-temperature superconductors (HTS) have the potential to enable magnetic fields beyond the current limits of low-temperature superconductors in applications like accelerator magnets. [...]
arXiv:2404.13333. - 9 p.
Fulltext
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5.
An open-source 3D FE quench simulation tool for no-insulation HTS pancake coils / Atalay, Sina (CERN ; Bogazici U.) ; Schnaubelt, Erik (CERN ; Darmstadt, Tech. Hochsch.) ; Wozniak, Mariusz (CERN) ; Dular, Julien (CERN) ; Zachou, Georgia (CERN ; Natl. Tech. U., Athens) ; Schöps, Sebastian (Darmstadt, Tech. Hochsch.) ; Verweij, Arjan (CERN)
A new module, Pancake3D, of the open-source Finite Element Quench Simulator (FiQuS) has been developed in order to perform transient simulations of no-insulation (NI) high-temperature superconducting (HTS) pancake coils in 3-dimensions. FiQuS/Pancake3D can perform magnetodynamic or coupled magneto-thermal simulations. [...]
arXiv:2311.09177.- 2024-05-08 - 11 p. - Published in : Supercond. Sci. Technol. 37 (2024) 065005 Fulltext: Publication - PDF; 2311.09177 - PDF;
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6.
Finite-Element Modeling of Power Cables Using Coordinate Transformations / Piwonski, Albert (Berlin, Tech. U.) ; Dular, Julien (CERN) ; Rezende, Rodrigo Silva (Berlin, Tech. U.) ; Schuhmann, Rolf (Berlin, Tech. U.)
Power cables have complex geometries in order to reduce their ac resistance. Although there are many different cable designs, most have in common that their inner conductors’ cross section is divided into several electrically insulated conductors, which are twisted over the cable’s length (helicoidal symmetry). [...]
2024 - 4 p. - Published in : IEEE Trans. Magn. 60 (2024) 7401104
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7.
Quench Co-Simulation of Canted Cos-Theta Magnets / Wozniak, Mariusz (CERN) ; Schnaubelt, Erik (CERN ; Darmstadt, Tech. U.) ; Dular, Julien (CERN) ; Ravaioli, Emmanuele (CERN) ; Verweij, Arjan (CERN)
Canted Cos-Theta (CCT) magnets can use conducting formers in which eddy currents are induced during current change. This is relevant during magnet ramping or discharging after a quench, particularly when using energy extraction. [...]
2024 - 5 p. - Published in : IEEE Trans. Appl. Supercond. 34 (2024) 4900105
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8.
Magneto-Thermal Thin Shell Approximation for 3D Finite Element Analysis of No-Insulation Coils / Schnaubelt, Erik (CERN ; Darmstadt, Tech. U.) ; Atalay, Sina (CERN ; Bogazici U.) ; Wozniak, Mariusz (CERN) ; Dular, Julien (CERN) ; Geuzaine, Christophe (Liege U.) ; Vanderheyden, Benoît (Liege U.) ; Marsic, Nicolas (Darmstadt, Tech. U.) ; Verweij, Arjan (CERN) ; Schöps, Sebastian (Darmstadt, Tech. U.)
For finite element (FE) analysis of no-insulation (NI) high-temperature superconducting (HTS) pancake coils, the high aspect ratio of the turn-to-turn contact layer (T2TCL) leads to meshing difficulties which result in either poor quality mesh elements resulting in a decrease of the solution accuracy or a high number of degrees of freedom. We proposed to mitigate this issue by collapsing the T2TCL volume into a surface and using a so-called thin shell approximation (TSA). [...]
arXiv:2310.03138.- 2024-05 - 6 p. - Published in : 10.1109/TASC.2023.3340648 Fulltext: PDF;
In : 16th European Conference on Applied Superconductivity (EUCAS 2023), Bologna, Italy, 3 - 7 Sep 2023
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9.
Finite Element Models for Magnetic Shields Made of Stacked Superconducting Tape Annuli / Dular, Julien (CERN) ; Brialmont, Sébastien (Liege U.) ; Vanderbemden, Philippe (Liege U.) ; Geuzaine, Christophe (Liege U.) ; Vanderheyden, Benoît (Liege U.)
Stacks of high-temperature superconducting tape annuli can be used as magnetic shields operating efficiently for both axial and transverse fields. However, due to their layered geometry and hybrid electrical and magnetic properties, implementing models of such structures is not straightforward. [...]
arXiv:2309.15623.- 2024 - 7 p. - Published in : IEEE Trans. Appl. Supercond. 34 (2024) 4903507 Fulltext: PDF;
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10.
On the Stability of Mixed Finite-Element Formulations for High-Temperature Superconductors / Dular, Julien (Liege U.) ; Harutyunyan, Mane (Darmstadt, Tech. U.) ; Bortot, Lorenzo (Darmstadt, Tech. U. ; CERN) ; Schöps, Sebastian (Darmstadt, Tech. U.) ; Vanderheyden, Benoit (Liege U.) ; Geuzaine, Christophe (Liege U.)
In this work, we present and analyze the numerical stability of two coupled finite element formulations. The first one is the h-a-formulation and is well suited for modeling systems with superconductors and ferromagnetic materials. [...]
arXiv:2106.00313.- 2021-07-26 - 12 p. - Published in : IEEE Trans. Appl. Supercond. 31 (2021) 8200412 Fulltext: PDF;
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