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REBCO coated conductors: enabling the next generation of tokamak reactors
Superconductor Science and TechnologyAbstract The discovery of rare-earth barium copper oxide (REBCO) materials with high critical temperatures, and the continued advancements in the fabrication of REBCO coated conductors with extremely high critical current densities, has enabled the developm…
Runaway electron beam formation, vertical motion, termination and wall loads in EU-DEMO
arXivRunaway electron loads onto material structures are a major concern for future large tokamaks due to the efficient avalanching at high plasma currents. Here, we perform predictive studies using the JOREK code for a plausible plasma configuration in the Euro…
Verification of global gyrokinetic simulation of low frequency mode excited by thermal plasma in spherical tokamak
Nuclear FusionAbstract A low frequency Alfven eigenmode in the ST40 spherical tokamak (ST) is found to be resonantly excited by thermal ions from global gyrokinetic GTC simulations. The analyses of phase-space resonances and wave-particle energy exchanges show that the B…
CIEMAT-QI4X: a reactor-relevant quasi-isodynamic stellarator configuration compatible with an island divertor
arXivA four-field-period quasi-isodynamic stellarator configuration is presented that exhibits small neoclassical and electrostatic turbulent transport, good fast-ion confinement over a wide range of $β$ values, small bootstrap current and an edge island structu…
A neutron spectrometer based on recoil proton track imaging for high-yield inertial confinement fusion primary deuterium–tritium neutrons
Review of Scientific InstrumentsThe energy spectra of primary deuterium-tritium (DT) neutrons provide essential information about the implosion performance in inertial confinement fusion (ICF) experiments. Recoil proton track imaging is a recently developed technique for measuring neutron…
First measurements of velocity-space resolved intra-ELM fast-ion losses on the TCV tokamak
Nuclear FusionAbstract Edge Localised Modes (ELMs) induced fast-ion losses have been characterised in the energy, E , and pitch, λ = v ∥ / v , space using a unique Fast Ion Loss Detector (FILD) on the tokamak à configuration variable. The FILD is equipped with a 128 Aval…
Accessing the density-free regime with ECRH-assisted ohmic start-up on EAST
Science AdvancesHigh plasma density operation is crucial for a tokamak to achieve energy breakeven and burning plasma. However, there is often an empirical upper limit of electron density in tokamak operation, namely, the Greenwald density limit [Formula: see text], above…
Surrogate models for particle and power exhaust in divertor tokamak simulations
JuSER (Forschungszentrum Jülich)The heat exhaust constitutes one of the most critical operational limits in tokamak fusion reactors. Unmitigated, the expected heat fluxes in future reactors will exceed what is sustainable for known materials. The scrape-off layer connects the plasma and r…
The properties of resistive MHD modes and unstable spectra in advanced tokamak regimes
arXivAbstract Advanced tokamak regimes, featuring extended regions of low magnetic shear, are promising candidates for future fusion reactors but are also more prone to specific kinds of MHD instabilities. The proximity to a rational surface in a very low shear…
Gas puff imaging of plasma turbulence in the magnetic island scrape-off layer of W7-X
Nuclear Materials and Energy• Gas puff imaging of plasma turbulence in the magnetic island scrape-off layer on W7-X. • Observation of a radial profile of sheared poloidal flows and its relationships to the connection length profile. • Negligible level of radial transport in the confin…
Investigation of a gallium alloy liquid metal mirror for application in inertial fusion energy systems
Optical Materials ExpressThe final optic in future inertial fusion energy plants must maintain high performance and survivability under gigashot laser irradiation while exposed to fusion byproducts. Although no practical solution has been demonstrated, a self-healing final turning…
The high-field tokamak physics basis for the ARC fusion power plant
Journal of Plasma PhysicsAn abstract is not available for this content. As you have access to this content, full HTML content is provided on this page. A PDF of this content is also available in through the ‘Save PDF’ action button.
Localized 3D control of energetic electron-driven toroidal Alfven eigenmode using resonant magnetic perturbations in the EAST tokamak
Nuclear FusionAbstract The formation of a static 3D helically localized perturbation structure of the toroidal Alfvén eigenmode (TAE) is observed for the first time under static magnetic islands induced by resonant magnetic perturbations (RMPs) in tokamak plasmas. Before…
Testing tungsten plasma facing components in WEST and AUG tokamaks
Nuclear FusionAbstract Next step fusion devices will face unprecedented heat loads and particle fluence with thousands of hours of plasma exposure on plasma-facing components (PFCs) cumulated over the entire lifetime of the device. These components must guarantee an acce…
Accuracy assessment of the calorimetric system for measurement of ITER’s fusion energy output
Nuclear FusionAbstract The calorimetric system of ITER is designed to measure the time-integrated fusion power output of the tokamak by analysing thermal flows and calculating the energy balance. While too slow for real-time control, its high accuracy is essential for cr…
A quasi-isodynamic stellarator configuration towards a fusion power plant
Journal of Plasma PhysicsThis work demonstrates that magnetohydrodynamic (MHD) stable, quasi-isodynamic (QI) stellarator equilibria with reduced turbulence can be generated with an optimised coilset. We present one such equilibrium which, when being generated by coils, maintains th…
Health Physics Aspects of an Inertial Confinement Fusion Power Facility
QeiosRecent advances at the National Ignition Facility resulted in the achievement of fusion ignition using inertial confinement. This milestone event provided positive evidence for the potential viability of an inertial confinement power facility. Although thes…
The physics of ELM-free regimes in EUROfusion tokamaks
arXiv (Cornell University)The development of operational scenarios without large Type-I ELMs is of utmost importance for the stable operation and longevity of future tokamaks. The EUROfusion tokamak exploitation program has therefore made the understanding of ELM-free regimes a majo…
On the drive of n_φ = 0 modes by ICRF accelerated ions in a tokamak
Nuclear FusionAbstract Energetic ions have the potential to drive instabilities with toroidal mode number of n_φ = 0 in tokamak fusion plasmas. A necessary condition is that their distribution function is either anisotropic or exhibits a region of phase space with a posi…
A machine learning case study in nuclear fusion: Assessment of the absolute deuterium-tritium fusion power of ITER with gamma-ray spectroscopy
Energy and AINuclear fusion holds great potential as a carbon-neutral means of electricity production. However, technical aspects of its implementation remain challenging. The real-time measurement of the fusion power released during Deuterium-Tritium (DT) fusion is one…
Effect of CT fuel deposition on the plasma density profile in the HL-3 tokamak
Plasma Physics and Controlled FusionAbstract Direct fuelling of the core region of a tokamak by compact torus (CT) injection plays a crucial role for fuelling and burning efficiency in a fusion reactor. However, the penetration and deposition processes of CT in fusion devices involve complex…
Preliminary engineering design of the first wall and X-point divertor of the Helios planar coil stellarator
Fusion Engineering and Design“Helios” is a two-field-period, quasi-axisymmetric (“QA”) planar coil stellarator power plant that features a novel, toroidally-continuous, non-resonant X-point divertor isomorphic to that of a tokamak with resonant magnetic perturbations. This work describ…
Design of high-gain laser fusion with heatwave-driven fast ignition scheme for inertial fusion energy
Nuclear FusionAbstract We design a high-gain laser fusion employing a fast ignition scheme for inertial fusion energy with a total laser energy less than 1 megajoule. A solid-sphere target which is robust to hydro instabilities is utilized instead of a fragile shell targ…
Milestone in predicting core plasma turbulence: successful multi-channel validation of the gyrokinetic code GENE
Nature CommunicationsOn the basis of several recent breakthroughs in fusion research, many activities have been launched around the world to develop fusion power plants on the fastest possible time scale. In this context, high-fidelity simulations of the plasma behavior on larg…