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UKAEA-CCFE-PR(25)3352025
The calibration of the JET x-ray spectrometer is presented. The absolute throughput, diffractor focussing and instrument function of the spectrometer is presented and the quality of the ion temperature measurement is re-assessed, particularly at the lower end. The addition of a second diffractor enables simultaneous measurements of the spectra …
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UKAEA-CCFE-PR(25)3342025
This study aims to systematically examine various methods leveraging machine learning (ML) to assimilate data for investigating thermal systems. These measured or observed data may include temperature or thermal material properties and could be synthetically (computationally) generated or experimentally obtained. The goal of these ML-augmented meth…
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UKAEA-CCFE-PR(25)3332024
The plasma-facing components of nuclear fusion reactors are continuously subjected to high thermal loads and bombardment by hydrogenic ions, resulting in erosion of the first-wall material and sputtering of atomic and molecular species into the edge plasma. The management of reactor component lifetimes and control of sputtered plasma impurities r…
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UKAEA-CCFE-PR(25)3322025
Lithium oxide is an important candidate material for tritium breeding in fusion nuclear reactors. Here we assess the disorder created in Li2O on bombardment by high-energy neutrons, examining the mechanisms of recovery and the…
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UKAEA-CCFE-CP(25)162023
Permeation of hydrogen isotopes, especially tritium, is expected to be a major challenge for future fusion reactors due to the high temperatures expected. Countless permeation experiments have been performed with the aim to study hydrogen permeation and permeation barriers, varying in many ways: the materials used, the experimental conditions under…
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UKAEA-CCFE-PR(25)3312025
The effect of different D2 fueling locations and divertor closure in the MAST-U is studied in detail with the SOLPS-ITER code to gain insights to detachment physics in H-mode plasma experiments in conventional divertor (CD) configuration. The SOLPS-ITER simulations for MAST-U H-mode plasma reveals that changing D2 fueling location significantly i…
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UKAEA-CCFE-PR(25)3292025
Tungsten-based low-activation high-entropy alloys are possible candidates for next-generation fusion reactors due to their exceptional tolerance to irradiation, thermal loads, and stress. We develop an accurate and efficient machine-learned interatomic potential for the W–Ta–Cr–V system and use it in hybrid Monte Carlo mo…
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UKAEA-CCFE-PR(25)3302025
A phase-field model is developed to simulate intergranular corrosion of ferritic/martensitic steels exposed to liquid lithium. The chromium concentration of the material is used to track the mass transport within the metal and liquid (corrosive) phase. The framework naturally captures intergranular corrosion by enhancing the di…
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UKAEA-CCFE-PR(25)3282025
Experiments and finite element modelling have been used to explore a method for miniaturising fibre push-out testing to the scale of thin ion irradiated layers. Correlation of interfacial surface area to debond stress has been identified for short fibres, and is related to a size effect following a Weibull distribution. Weibull analysis may be us…
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UKAEA-CCFE-PR(25)3272025
High-entropy alloys (HEAs) are being explored as potential candidates for radiation-tolerant materials, with some compositions exhibiting good resistance to defect cluster formation. One such system is WTaCrV, although only a single composition has been experimentally tested under ion irradiation, where it showed phase decomposition at low temperat…
Showing 1 - 10 of 2397 UKAEA Paper Results