Julien Dular
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View article: Acceleration of Multi-Scale LTS Magnet Simulations with Neural Network Surrogate Models
Acceleration of Multi-Scale LTS Magnet Simulations with Neural Network Surrogate Models Open
While the prediction of AC losses during transients is critical for designing large-scale low-temperature superconducting (LTS) magnets, brute-force finite-element (FE) simulation of their detailed geometry down to the length scale of the …
View article: Reduced Order Hysteretic Flux Model for Transport Current Homogenization in Composite Superconductors
Reduced Order Hysteretic Flux Model for Transport Current Homogenization in Composite Superconductors Open
In this paper, we present the Reduced Order Hysteretic Flux (ROHF) model to describe the relationship between time-varying transport current and internal magnetic flux for composite superconductors. The ROHF model is parametrized using ref…
View article: Numerical and experimental investigation of AC losses in MgB<sub>2</sub> wires
Numerical and experimental investigation of AC losses in MgB<sub>2</sub> wires Open
The efficacy of MgB 2 -based cables for DC power transmission applications is well-established due to several advantageous properties such as the natural abundance and cost-effectiveness of precursor powders and the innate compatibility wi…
View article: High Field Magnet Programme -- European Strategy Input
High Field Magnet Programme -- European Strategy Input Open
In this submission, we describe research goals, implementation, and timelines of the High Field Magnet Programme, hosted by CERN. The programme pursues accelerator-magnet R&D with low-temperature- and high-temperature superconductor techno…
View article: Reduced order hysteretic magnetization model for composite superconductors
Reduced order hysteretic magnetization model for composite superconductors Open
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. Once the parameters of the R…
View article: Influence of Critical Current Defect on Operation, Quench Detection and Protection of a Conduction-Cooled Pancake REBCO Coil
Influence of Critical Current Defect on Operation, Quench Detection and Protection of a Conduction-Cooled Pancake REBCO Coil Open
High-temperature superconductor (HTS) coated conductors (CC) are often wound into pancake coils with electrical insulation in-between the turns. The copper terminals are used for current injection and conduction cooling. An inherent variat…
View article: A Finite Element $a$-$h$-Formulation for the Reduced Order Hysteretic Magnetization Model for Composite Superconductors
A Finite Element $a$-$h$-Formulation for the Reduced Order Hysteretic Magnetization Model for Composite Superconductors Open
The simulation of transient effects in large-scale superconducting systems with the finite element method is computationally expensive. A Reduced Order Hysteretic Magnetization (ROHM) model has been recently proposed for the computation of…
View article: Simulation of Rutherford Cable AC Loss and Magnetization With the Coupled Axial and Transverse Currents Method
Simulation of Rutherford Cable AC Loss and Magnetization With the Coupled Axial and Transverse Currents Method Open
The coupled axial and transverse currents (CATI) method was recently introduced to model the AC loss and magnetization in twisted composite superconducting strands with low computational cost and high accuracy. This method involves two-dim…
View article: Simulation of Rutherford Cable AC Loss and Magnetization with the Coupled Axial and Transverse Currents Method
Simulation of Rutherford Cable AC Loss and Magnetization with the Coupled Axial and Transverse Currents Method Open
The coupled axial and transverse currents (CATI) method was recently introduced to model the AC loss and magnetization in twisted composite superconducting strands with low computational cost and high accuracy. This method involves two-dim…
View article: Reduced Order Hysteretic Magnetization Model for Composite Superconductors
Reduced Order Hysteretic Magnetization Model for Composite Superconductors Open
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. Once the parameters of the R…
View article: Enhancing the magnetic field gradient between two superconductors with rotational motion under a background DC field
Enhancing the magnetic field gradient between two superconductors with rotational motion under a background DC field Open
The ability of bulk high-temperature superconductors to trap magnetic flux densities up to one order of magnitude larger than the saturation magnetization of conventional ferromagnetic materials offers the prospect of generating large magn…
View article: Coupled axial and transverse currents method for finite element modelling of periodic superconductors
Coupled axial and transverse currents method for finite element modelling of periodic superconductors Open
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. …
View article: Helicoidal Transformation Method for Finite Element Models of Twisted Superconductors
Helicoidal Transformation Method for Finite Element Models of Twisted Superconductors Open
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 si…
View article: Parallel-in-Time Integration of Transient Phenomena in No-Insulation Superconducting Coils Using Parareal
Parallel-in-Time Integration of Transient Phenomena in No-Insulation Superconducting Coils Using Parareal Open
High-temperature superconductors (HTS) have the potential to enable magnetic fields beyond the current limits of low-temperature superconductors in applications like accelerator magnets. However, the design of HTS-based magnets requires co…
View article: An open-source 3D FE quench simulation tool for no-insulation HTS pancake coils
An open-source 3D FE quench simulation tool for no-insulation HTS pancake coils Open
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 pancake coils in three-dimensions. F…
View article: Coupled Axial and Transverse Currents Method for Finite Element Modelling of Periodic Superconductors
Coupled Axial and Transverse Currents Method for Finite Element Modelling of Periodic Superconductors Open
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. …
View article: Finite Element Models for Magnetic Shields Made of Stacked Superconducting Tape Annuli
Finite Element Models for Magnetic Shields Made of Stacked Superconducting Tape Annuli Open
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, implem…
View article: Magneto-Thermal Thin Shell Approximation for 3D Finite Element Analysis of No-Insulation Coils
Magneto-Thermal Thin Shell Approximation for 3D Finite Element Analysis of No-Insulation Coils Open
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 …
View article: Quench Co-Simulation of Canted Cos-Theta Magnets
Quench Co-Simulation of Canted Cos-Theta Magnets Open
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. CCT magnet…
View article: Helicoidal Transformation Method for Finite Element Models of Twisted Superconductors
Helicoidal Transformation Method for Finite Element Models of Twisted Superconductors Open
This paper deals with the modelling of superconducting and resistive wires with a helicoidal symmetry, subjected to an external field and a transport current. Helicoidal structures are three-dimensional, and therefore yield computationally…
View article: An Open-Source 3D FE Quench Simulation Tool for No-Insulation HTS Pancake Coils
An Open-Source 3D FE Quench Simulation Tool for No-Insulation HTS Pancake Coils Open
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. Fi…
View article: Magneto-Thermal Thin Shell Approximation for 3D Finite Element Analysis of No-Insulation Coils
Magneto-Thermal Thin Shell Approximation for 3D Finite Element Analysis of No-Insulation Coils Open
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 …
View article: Finite Element Models for Magnetic Shields Made of Stacked Superconducting Tape Annuli
Finite Element Models for Magnetic Shields Made of Stacked Superconducting Tape Annuli Open
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, implem…
View article: How to overcome the demagnetization of superconducting Halbach arrays?
How to overcome the demagnetization of superconducting Halbach arrays? Open
Assembling trapped-field superconducting magnets with mutually orthogonal magnetizations directions in a Halbach array configuration offers the prospect of generating both high fields and large field gradients. A major issue when assemblin…
View article: Finite Element Modeling of Power Cables using Coordinate Transformations
Finite Element Modeling of Power Cables using Coordinate Transformations Open
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 con…
View article: Magnetic shielding up to 0.67 T at 77 K using a stack of high temperature superconducting tape annuli of 26 mm bore
Magnetic shielding up to 0.67 T at 77 K using a stack of high temperature superconducting tape annuli of 26 mm bore Open
In this work we demonstrate the magnetic shielding ability of a stack of YBa 2 Cu 3 O 7 tape annuli. The annuli are cut from a 46 mm wide second generation coated conductor deposited on a Ni-5at.%W alloy ferromagnetic (FM) substrate. The i…
View article: 2-D Eddy Current Boundary Value Problems for Power Cables With Helicoidal Symmetry
2-D Eddy Current Boundary Value Problems for Power Cables With Helicoidal Symmetry Open
Power cables have complex geometries in order to reduce their AC resistance. The cross-section of a cable consists of several conductors that are electrically insulated from each other to counteract the current displacement caused by the s…
View article: Annuli of coated conductors with a ferromagnetic substrate: magnetic shielding properties at 77 K and at room temperature
Annuli of coated conductors with a ferromagnetic substrate: magnetic shielding properties at 77 K and at room temperature Open
International audience
View article: 3D Modelling of the Currents Induced in a Superconducting Linear Halbach array
3D Modelling of the Currents Induced in a Superconducting Linear Halbach array Open
International audience