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UKAEA-CCFE-PR(26)4502024
In magnetic fusion devices, undesired non-axisymmetric magnetic field perturbations, typically called error fields (EF), have been observed to have a detrimental effect on plasma stability and confinement and can lead to a brute plasma termination, i.e. plasma disruption events (Buttery et al 1999, Nuc. Fus. 39, 1827). The main strategies that c…
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UKAEA-CCFE-CP(26)452024
A real-time plasma magnetic equilibrium controller has been developed to aid in the precise control of advanced configurations such as double-null, super-X, X-point target and X-divertor for the first time on the MAST Upgrade (MAST-U) tokamak. Successful real-time magnetic equilibrium control of different plasma shape control variables during th…
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UKAEA-CCFE-PR(26)4492024
This paper reports the use of combined microscopy and small angle neutron scattering (SANS) to probe into the compositional and size evolution of the primary carbides and nanoparticles (defined by a size threshold of 100 nm) in an additively manufactured high-alloy steel before and after heat treatment. The primary carbides show a marginal chang…
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UKAEA-CCFE-PR(26)4482025
Fluid activation is of critical importance to fusion power plant design, as it can impact dose rates to maintenance personnel, heating in sensitive components, and radionuclide inventories with implications for accident scenarios and waste. The levels of fluid activation in a system are dependent on the neutron flux spectrum and the exposure time o…
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UKAEA-CCFE-PR(26)4462023
This work investigated the impact of electron beam (EB) welding, and in particular varying the transverse speed of the electron beam (i.e. 1200-2200 mm/min), on the resultant microstructure of PM2000 ODS steel, using analytical electron microscopy and microhardness. The resultant range of heat inputs during welding explored in this study (72-39 J/m…
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UKAEA-CCFE-PR(26)4472024
The DEMOnstrative power plant (DEMO) project is currently leading the research endeavours within the fusion field with the goal of developing a next generation practical fusion reactor. Given the challenging nature of the application, it is essential to establish methodologies that can provide convenient and reliable characterisation of the chos…
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UKAEA-CCFE-PR(26)4442023
Abnormal (deviating from target) variations in the plasma current Ip and vertical position Z constitute common cross-shot/device elements of a disruption, a phenomenon that is to be avoided (or ultimately mitigated) in future reactor-relevant tokamaks. Those abnormalities constitute important instances within disruptive chain of events (e.g. spi…
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UKAEA-CCFE-PR(26)4432023
This work presents the results following the first irradiation of ITER materials samples in a tokamak D–T plasma environment operating at significant fusion power. The materials exposed to this nuclear environment at the Joint European Torus include representative ITER samples from various components such as poloidal field (PF) coil jacket…
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UKAEA-STEP-PR(26)032023
Introduction of cross-field drifts in SOLPS-ITER simulations of connected double-null plasmas in STEP with the ion ∇B × B drift towards the upper divertors was found to enhance the detachment of the inner divertors with decreased target densities and ion and heat fluxes, while simultaneously complicating the access to detachment in the outer low…
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UKAEA-RACE-CP(26)022023
When using mobile robots to perform data collection about the surroundings, the performance might be dissatisfying since the environments could be unknown and challenging. This situation will pose challenges for mobile robot navigation and exploration. To tackle this issue, we propose a consensus-based deep reinforcement learning (DRL) algorithm…
Showing 31 - 40 of 2581 UKAEA Paper Results