A5114357245- Superconducting Materials and Applications
- Magnetic confinement fusion research
- Particle accelerators and beam dynamics
- Fusion materials and technologies
- Spacecraft and Cryogenic Technologies
- Nuclear reactor physics and engineering
- Advanced Thermodynamic Systems and Engines
- Nuclear Materials and Properties
- Water Systems and Optimization
- Acoustic Wave Phenomena Research
- Nuclear Physics and Applications
- Nuclear and radioactivity studies
- Flow Measurement and Analysis
- Structural Health Monitoring Techniques
- Underwater Acoustics Research
- Speech and Audio Processing
- Heat Transfer and Optimization
- Advanced Measurement and Detection Methods
- Advanced X-ray and CT Imaging
- Electric Motor Design and Analysis
- Non-Destructive Testing Techniques
- Real-Time Systems Scheduling
- Fault Detection and Control Systems
- Risk and Safety Analysis
- Medical Imaging Techniques and Applications
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2014-2024
CEA Paris-Saclay
2012-2024
CEA Grenoble
2011-2024
Université Grenoble Alpes
2015-2024
Direction de la Recherche Fondamentale
2012-2024
CEA Cadarache
2012-2024
Département des Systèmes Basses Températures
2008-2023
ITER
2012-2022
Institut de Recherche Interdisciplinaire de Grenoble
2022
Direction des énergies
2017-2019
The magnet feeders are part of the critical systems a fusion reactor since they represent interface between in-cryostat components at 4.5 K and room-temperature cryogenic plant power supply. European DEMO tokamak foresees 16 toroidal field (TF) coil feeders, 5 central solenoid (CS) 6 poloidal (PF) which must be routed inside galleries building. By realising required electrical connections, mechanical supports casing, as well hosting instrumentation cables, ensure safe operation...
The most distinctive feature of the superconducting magnet system for JT-60SA is optimized coil structure in terms space utilization as well highly accurate manufacturing, thus meeting requirements steady-state tokamak research: a conceptually new outer inter-coil separated from casing introduced to toroidal field coils realize their slender shape, allowing large-bore diagnostic ports detailed plasma measurements. A method minimize manufacturing error equilibrium-field has been established,...
JT-60SA is the satellite tokamak for ITER in Broader Approach agreement. The uses 18 toroidal field coils, a central solenoid with 4 modules, and 6 equilibrium they are all superconducting coils forced flow cooled conductors. All detailed designs of these have been completed. manufacturing conductors progressing Japan EU. This paper shows latest activities final design adjusting its magnet system their utilities.
The superconducting tokamak JT-60 Super Advanced (JT-60SA) is part of the Broader Approach Programme agreed between Europe and Japan. Among other in kind contributions, CEA charge supplying Cryogenic System which includes a Warm Compression Station, Refrigerator Cold Box, Auxiliary compressed air station vacuum systems. cryogenic system requires refrigeration capacity about 8 kW equivalent at 4.5 K. It will supply cryopump panels 3.7 K, magnets cold structures 4.4 HTS current leads 50...
The superconducting tokamak JT-60SA is part of the Broader Approach Programmeagreed between Japan and Europe. CEA in charge cryogenic system procurementincluding Warm Compression Station, gas storages, Refrigerator Cold Box andthe Auxiliary (ACB) which has to be installed on JAEA Naka site 2016.This paper summarizes updated requirements for JT-60SAcryogenic system. a refrigeration capacity about 9 kW equivalent at 4.5K, supply cryopump panels 3.7 K, magnets cold structures 4.4 HTS current...
JT-60SA is foreseen in the Broader Approach Agreement as satellite tokamak for ITER. It uses 18 toroidal field coils, a central solenoid with four modules, and six equilibrium coils. The coils are all superconducting forced-flow cooled conductors. Series production of conductors progressing Japan Europe. This paper shows latest manufacturing activities magnet system its utilities.
The JT-60SA project will use superconducting magnets to confine the plasma and achieve a current with typical flat top duration of 100 second in purely inductive mode. helium refrigerator has an equivalent cooling power 9 kW at 4.5 K providing 3.7 K, 50 80 for diverter cryopump, magnets, HTS leads, thermal shields, respectively. This paper summarizes commissioning activities aiming successful operation heat load smoothing technology manage 12 pulses by using 7000 liter liquid helium.
The JT-60SA fusion experiment is under commissioning at Naka, Japan (2023). When a fast safety discharge (FSD) of the toroidal field coils (TFC) current occurs, procedure to close supercritical helium (SHe) supply magnets from auxiliary cold box release heated and pressurized coil its structure into quench tank avoid over-pressurizing loop. To restart normal operation, evaporated must be re-liquefied return This can take up 48 hours. maximal pressure reached in loop during FSD has predicted...
Abstract MYRRHA (Multi-purpose hYbrid Research Reactor for High-tech Applications) will be composed of a 600 MeV LINear ACcelerator (LINAC) with large number cryomodules and 100 MW thermal power subcritical nuclear reactor cooled by lead-bismuth. The MINERVA Isotopes productioN coupling the linEar acceleRator to Versatile proton target fAcility) project is first phase MeV, 4 mA continuous-wave LINAC. LINAC takes advantage 60 superconducting radiofrequency (RF) cavities at 2 K saturated...
Strategies for smoothing pulsed heat loads are of great interest future operation large refrigeration systems tokamaks, such as JT-60SA or ITER their superconducting magnets cooled by independent supercritical helium loops. Numerical and experimental process studies have been conducted at CEA Grenoble to validate optimize the control scale circuits. At cryo-distribution level, in auxiliary cold box, load effects analysed on a scaled down loop driven circulator. Variation pressure mass flow...
The ITER cryogenic system will have to cope with substantial dynamic heat loads due the magnetic field variation and production of neutrons generated by fusion reactions.This induce large pressure variations in primary cooling loop superconducting coils, which results power helium refrigerator.The HELIOS test facility, developed at CEA-Grenoble, initially designed study pulse mitigation JT-60SA central solenoid circuit (in order smooth pulsed load components), was adapted requirements.This...
The superconducting magnets of the tokamak JT-60SA are cooled by means forced flows supercritical helium at 4.4 K and 0.5 MPa. closed loops transfer heat from to refrigerator through exchangers immersed into a saturated liquid bath. An experimental loop was designed represent 1/20 scaled down mock-up central solenoid cooling circuits. This design for keeping same transit times in circuits, aims observing thermally induced transients loop. Indeed, heated section simulates variable loads...
In the framework of JT-60SA project, a para- metric study was performed on He mass flow rate cooling Toroidal Field (TF) system. This is crucial design parameter, since high value favorable regarding temperature margin criterion, but requires more circulation power thus generating one main cryogenic loads. The led with Tacos/Texto tool, based Ansys (thermal) and Gandalf (thermohydraulics) codes. impact TF conductor analyzed, hand other aspects such as magnet heat loads smoothing overall...
The cryogenic system for the superconducting tokamak JT-60SA is currently being commissioned in Naka, Japan and shall be ready operation summer 2016. This contribution part of Broader Approach agreement between Europe. With an equivalent refrigeration capacity about 9.5 kW at 4.5 K will supply cryo-pump panels 3.7 K, magnets their structures 4.4 high temperature current leads 50 thermal shields 80 100 K. has been specifically designed to handle large pulse loads during plasma operation....
During the integrated commissioning of JT-60SA tokamak, Toroidal Field (TF) magnet has experienced fast current discharges which have induced AC losses in its winding packs (WP) and casings. Using thermo-hydraulic sensors network installed at inlet outlet TF coils, we performed enthalpy balances to estimate transient heat loads generated by losses. In parallel, modeled hysteresis coupling produced WP eddy currents casings such events. We then assess discuss consistency between these...
Superconducting magnets for fusion are subjected to large variations of heat loads due cycling operation tokamaks. The cryogenic system shall operate smoothly extract the pulsed by circulating supercritical helium into coils and structures. However value total its temporal variation not known before plasma scenario starts. A real-time load estimator is interest process control in order anticipate arrival refrigerator finally optimize system. thermal affects physical parameters loop...