T. Ahlgren
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View article: Solubility of Hydrogen in a WMoTaNbV High-Entropy Alloy
Solubility of Hydrogen in a WMoTaNbV High-Entropy Alloy Open
The WMoTaNbV alloy has shown promise for applications as a solid state hydrogen storage material. It absorbs significant quantities of H directly from the atmosphere, trapping it with high energy. In this work, the dynamics of the absorpti…
View article: Deuterium retention in tungsten studied by sequential implantations at ELM-relevant energies
Deuterium retention in tungsten studied by sequential implantations at ELM-relevant energies Open
Plasma edge-localized modes (ELMs) can cause considerable fuel retention in fusion reactor vessel walls by implanting plasma particles with high energies and fluxes. The effect of deuterium ions implanted into tungsten with ELM-relevant en…
View article: Irradiation Damage Independent Deuterium Retention in WMoTaNbV
Irradiation Damage Independent Deuterium Retention in WMoTaNbV Open
High entropy alloys are a promising new class of metal alloys with outstanding radiation resistance and thermal stability. The interaction with hydrogen might, however, have desired (H storage) or undesired effects, such as hydrogen-induce…
View article: Overview of JET results for optimising ITER operation
Overview of JET results for optimising ITER operation Open
The JET 2019–2020 scientific and technological programme exploited the results of years of concerted scientific and engineering work, including the ITER-like wall (ILW: Be wall and W divertor) installed in 2010, improved diagnostic capabil…
View article: Molecular dynamics simulations of hydrogen isotope exchange in tungsten vacancies
Molecular dynamics simulations of hydrogen isotope exchange in tungsten vacancies Open
Solute hydrogen can cause many damaging processes in the lattices of metals, such as deformation of the material, which can take place in large scales through blistering and embrittlement. Especially in nuclear fusion applications, the tra…
View article: Hydrogen isotope exchange mechanism in tungsten studied by ERDA
Hydrogen isotope exchange mechanism in tungsten studied by ERDA Open
Future fusion reactors use a D–T plasma mixture as fuel. A fraction of hydrogen species can escape the plasma confinement and hit the first wall. Hydrogen isotope exchange, a process in which trapped T atoms are replaced with lighter hydro…
View article: Ion beam analysis of fusion plasma-facing materials and components: facilities and research challenges
Ion beam analysis of fusion plasma-facing materials and components: facilities and research challenges Open
Following the IAEA Technical Meeting on 'Advanced Methodologies for the Analysis of Materials in Energy Applications Using Ion Beam Accelerators', this paper reviews the current status of ion beam analysis (IBA) techniques and some aspects…
View article: Overview of the JET preparation for deuterium–tritium operation with the ITER like-wall
Overview of the JET preparation for deuterium–tritium operation with the ITER like-wall Open
For the past several years, the JET scientific programme (Pamela et al 2007 Fusion Eng. Des . 82 590) has been engaged in a multi-campaign effort, including experiments in D, H and T, leading up to 2020 and the first experiments with 50%/5…
View article: Direct observation of mono-vacancy and self-interstitial recovery in tungsten
Direct observation of mono-vacancy and self-interstitial recovery in tungsten Open
Reliable and accurate knowledge of the physical properties of elementary point defects is crucial for predictive modeling of the evolution of radiation damage in materials employed in harsh conditions. We have applied positron annihilation…
View article: Hydrogen isotope exchange in tungsten during annealing in hydrogen atmosphere
Hydrogen isotope exchange in tungsten during annealing in hydrogen atmosphere Open
The radiological safety of the future thermonuclear fusion devices depends critically on the total tritium inventory in the plasma-facing components. The planned method to remove tritium from the ITER reactor tungsten divertor is to perfor…
View article: On the stability and mobility of di-vacancies in tungsten
On the stability and mobility of di-vacancies in tungsten Open
Properties of small vacancy clusters in tungsten were studied with first-principles calculations. The binding and formation energies of the vacancy clusters increase with the cluster size. Dynamic characteristics of a di-vacancy were speci…
View article: Overview of the JET results in support to ITER
Overview of the JET results in support to ITER Open
The 2014-2016 JET results are reviewed in the light of their significance for optimising the ITER research plan for the active and non-active operation. More than 60 h of plasma operation with ITER first wall materials successfully took pl…
View article: Plasma–wall interaction studies within the EUROfusion consortium: progress on plasma-facing components development and qualification
Plasma–wall interaction studies within the EUROfusion consortium: progress on plasma-facing components development and qualification Open
The provision of a particle and power exhaust solution which is compatible with first-wall components and edge-plasma conditions is a key area of present-day fusion research and mandatory for a successful operation of ITER and DEMO. The wo…
View article: Long-term fuel retention and release in JET ITER-Like Wall at ITER-relevant baking temperatures
Long-term fuel retention and release in JET ITER-Like Wall at ITER-relevant baking temperatures Open
The fuel outgassing efficiency from plasma-facing components exposed in JET-ILW has been studied at ITER-relevant baking temperatures. Samples retrieved from the W divertor and Be main chamber were annealed at 350 and 240 degrees C, respec…
View article: Thermodynamics of impurity-enhanced vacancy formation in metals
Thermodynamics of impurity-enhanced vacancy formation in metals Open
Hydrogen induced vacancy formation in metals and metal alloys has been of great interest during the past couple of decades. The main reason for this phenomenon, often referred to as the superabundant vacancy formation, is the lowering of v…