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Serafina Baschetti10/03/2026, 08:30
The 18 NbโSn toroidal field (TF) coils of ITER, based on cable-in-conduit conductors (CICC) cooled by forced-flow supercritical helium, provide a peak field of 11.8 T at the plasma and store about 41 GJ of magnetic energy, making controlled fast discharge a key aspect of the magnet protection strategy (Ref [1]). To support commissioning and ensure reliable integration into the machine,...
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Luca Bottura (CERN)10/03/2026, 08:55
This paper presents a thermal network model of an ITER Toroidal Field (TF) coil pancake aimed at accurately simulating thermal coupling between conductor turns. The model is implemented within the CryoSoft THEA code and represents the pancake as a network of equivalent thermal resistances and capacitances, enabling efficient and physically consistent prediction of heat transfer paths among...
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Prof. Monika Lewandowska (The Henryk Niewodniczaลski Institute of Nuclear Physics Polish Academy of Sciences)10/03/2026, 09:20
The IPP team operated the W7-X superconducting magnet system at 1.8 T on the plasma axis in the last quarter of 2024. In contradiction to the standard 2.5 T operation the operating current in the conductors was significantly lower (11.027 kA vs. 15.32 kA). Both the lower magnetic field and the lower current affect the hotspot temperature in case of a fast discharge of the coils. Quench...
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Dr Kamil Sedlak (EPFL-SPC)10/03/2026, 09:45
In 2024, EUROfusion consortium released a new DEMO baseline with a slightly reduced aspect ratio (A=2.8 instead of 3.1), major radius (8.6 m instead of 9.1 m) and magnetic field (4.4 T instead of 5.2 T on the plasma axis) compared to the previous 2018 baseline. The fusion power is targeted to 1.65 GW. The design of all DEMO magnets have been updated in 2025. In this study, we present the...
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ROBERTO BONIFETTO10/03/2026, 10:25
Nearly two decades after achieving its first plasma in 2006, the Experimental Advanced Superconducting Tokamak (EAST) continues to serve as a key device for superconducting magnet technology, being the first tokamak to employ both toroidal and poloidal superconducting coil systems. Its Toroidal Field (TF) coil system consists of sixteen coils, each approximately 4 m in height, operated at...
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Mr Matteo Lanzolla (CERN)10/03/2026, 10:50
This work presents a numerical modeling framework for quench protection in the non-planar superconducting magnets of the GIGA stellarator reactor (Gauss Fusion), which store energies on the order of 100 GJ. The study focuses on the development and application of a predictive multi-physics model for an innovative active protection concept that eliminates external dump resistors by using the...
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Dr Yusuke Sogabe10/03/2026, 11:15
Spiral coated-conductor cables feature a structure where HTS coated conductors are wound in layers around a metal core. Their high thermal stability, high current density, and high mechanical flexibility make them promising candidates for applications in magnets and electrical machines. In particular, spiral copper-plated striated coated-conductor cables (SCSC cables) are expected to be...
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Dr Dong Keun Oh (Korea Institute of Fusion Energy)10/03/2026, 11:40
Bringing back the substantial idea of hybrid contact discontinuity (A. Shajii and J. P. Freidberg, 1996), thermally coupled 1-d fuild-solid system is carefully repriced on the fundamental question what is the best approach to the quench propagation model of superconducting CICC (cable-in-conduit conductor). By means of a mode analysis with the exact dispersion relation, the simple equations of...
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MARTINA CASCIELLO10/03/2026, 14:00
The non-uniform magnetic field and current density distribution inside superconductors must be considered for properly assessing critical aspects in the design of high-field magnetic systems. Understanding the static and dynamic magnetic behavior of High Temperature Superconductors (HTS) has significantly progressed thanks to the development of space- and time-resolved experimental techniques....
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Tiina-Mari Salmi10/03/2026, 14:25
Quench protection is difficult in HTS magnets due to slow quench propagation โ the coils are often overheating before the associated resistive voltage can be detected. Coil winding technologies without electrical insulation between coil turns are being developed to cope with this problem. In these coils, the operation current can by-pass the quenched cable segment to neighboring turn and...
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Shin Hasegawa (Gauss Fusion GmbH)10/03/2026, 14:50
Conventional fusion magnet system typically discharges the stored energy by external discharge resistors as a quench protection with a relatively short time constant, such as < 15 s for ITER magnets [1]. However, the resulting coil voltage to ground can exceed several kV, increasing the risk of accidental Paschen discharge or arcing. In addition, quench protection relying on the external...
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Marco Breschi (Universita e INFN, Bologna (IT))10/03/2026, 15:15
The ITER project represents a cornerstone of the global effort to achieve controlled thermonuclear fusion, with the objective of demonstrating the feasibility of sustaining a burning plasma and paving the way for future fusion power plants. Among its most critical subsystems are the Toroidal Field (TF) magnets, massive superconducting coils responsible for generating the strong and steady...
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9. Analytical and Numerical Analysis of Screening Currents in the HTS Muon Collider Cos-Theta DipoleFrancesco Mariani10/03/2026, 15:55
To achieve the realization of a 10 TeV Muon Collider facility and reduce the ring dimension to minimize muon decay, the main bending dipole magnets must generate high magnetic fields up to 16 T. Additionally, the superconducting coil aperture must accommodate thick tungsten shielding to protect the magnet from muon decay products. These challenging requirements motivate the investigation of...
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Dr Mykola Soloviov (Institute of Electrical Engineering, Slovak Academy of Sciences (SAS))10/03/2026, 16:20
The Coated Conductor (CC) tapes appear to be promising for the production of magnets and cables due to their high critical magnetic field and temperature, as well as competitive critical current density, in combination with good mechanical properties. On the other hand, the superconducting layer may exhibit high energy dissipation in an external magnetic field due to the relatively large...
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11/03/2026, 08:30
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Hajar ZGOUR (CEA Paris Saclay)11/03/2026, 09:00
Within the French exploratory program SupraFusion, we investigate fast and reliable quench detection and protection strategies for insulated REBCO coated-conductor stacks intended for fusion-relevant, high-field magnet systems. Because these insulated windings show very slow normal-zone propagation and hold large magnetic energies, conventional voltage-tap detection often reacts too late,...
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Nikolay Bykovskiy (EPFL SPC)11/03/2026, 09:25
Fast and reliable quench detection is one of the key challenges in the development of HTS magnets with large stored energy, in the range of MJ and higher. Several temperature-based detection methods are under study at EPFL Swiss Plasma Center, including twisted-pair superconducting wires (SQD), shielded thermocouple chains (TCC) and fiber-optics sensing (FOS). Integrating them into the winding...
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Aleksandra Dembkowska (West Pomeranian University of Technology in Szczecin)11/03/2026, 09:50
The central solenoid (CS) of a tokamak is engineered to withstand significant fluctuations in operating currents and rapid changes in magnetic fields. These capabilities are essential for initiating plasma breakdown and ensuring subsequent plasma shaping and control. A novel design has recently been introduced for the CS system designated for the next-generation experimental fusion device....
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Ms Silvia Pierri (NEMO Group, Dipartimento Energia, Politecnico di Torino, Torino 10129, Italy)11/03/2026, 10:55
Different magnetic confinement fusion projects, as SPARC, STEP, and EU DEMO among others, will (or are considering to) employ High Temperature Superconductors (HTS) in their magnet system, due to the possibility to generate an higher magnetic field if compared to Low Temperature Superconductors (LTS), which are considered the state of the art in superconductors.
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Even if HTS would increase... -
Clรฉment Genot11/03/2026, 11:20
Suprafusion is a French exploratory program focusing on the development of high-temperature superconductors (HTS) to meet tomorrow's energy and societal challenges, using fusion needs as a vector for this research. In particular, the program aims to design, manufacture and test a large-scale HTS demonstrator magnet. To meet this goal, the program will follow a stepwise development plan with...
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francois bonne (CEA IRIG DSBT)11/03/2026, 11:45
The DEMO (Demonstrator Power Plant) project is a magnetic-confinement demonstrator for a fusion power plant. Since the cryo-magnetic system is expected to represent a major cost, it must be carefully considered, particularly from the perspective of the superconducting material inventory and the associated cooling facility. In this paper, we explore the main cost factors of the cryo-magnetic...
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Douglas Martins Araujo (PSI)11/03/2026, 14:00
Following the CHART/PSI roadmap toward insulated REBCO-based high-field magnets, and after the completion of the first REBCO Subscale magnet (RS1), we aim to design a subscale demonstrator for a double-aperture high-field magnet featuring field alignment between the wide face of the cable and the magnetic field. The objective of this development is a reduction of field errors and ramp losses,...
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Gianluca De Marzi (INFN e Laboratori Nazionali di Frascati (IT))11/03/2026, 14:25
Fusion magnets experience sharp dB/dt excursions, especially during plasma breakdown and current ramp-up. Calculating the instantaneous power dissipation is therefore essential for quantifying, through thermal-hydraulic simulations, the local heat load that must be handled. Toward this purpose, we have developed a modelling framework, combining analytical formulations with finite-element...
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Rafal Ortwein11/03/2026, 14:50
Temperature variations during quench are a known cause of thermal strains and associated thermal stresses due to variation of the coefficient of thermal expansion between materials comprising the superconducting cable. In the case of the W7-X CICC, NbTi superconducting cable is placed inside an aluminum jacket wrapped with glass-epoxy electrical insulation. The strength of this composite...
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Valerio Calvelli (Universitรฉ Paris-Saclay (FR))11/03/2026, 15:15
The design of superconducting magnets demands a multi-phase, multi-scale and multi-physics approach which can be more or less challenging according to the complexity of the requirements. According to the different schools, the design effort is usually performed in three or four phases: we can identify them starting from the simplest to the most complex as feasibility design, conceptual design,...
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Luca Alfonso (INFN Genova)11/03/2026, 15:55
The design of superconducting magnet for a high-energy Muon Collider continues to push the limits of present magnet technology, requiring new ideas that go beyond those encountered in conventional LTS systems. In this context, we are exploring a block-coil dipole concept specifically tailored to the unconventional boundary conditions imposed by muon physics: intense radiation from muon decay,...
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Barbara Caiffi (INFN e Universita Genova (IT))11/03/2026, 16:20
A Muon Collider is one of the most promising options for the post-LHC era, offering leptonic precision without the limitations of synchrotron radiation that affect electron machines. Its feasibility, however, is strongly constrained by the short muon lifetime (2.2 ฮผs), which demands extremely rapid production, acceleration, cooling, and collisionโposing severe technological challenges.
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Among... -
Francesco Grilli12/03/2026, 08:30
The T-A formulation of Maxwellโs equations in the magneto-quasistatic approximation is a popular approach for simulating the electromagnetic behavior of high-temperature superconducting (HTS) wires, cables, and coils. The mathematical formulation of the model is based on the magnetic vector potential A (B=curl(A)) for calculating the magnetic field in the entire simulation domain and of the...
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