D.B. King C.D. Challis E.G. Delabie D. Keeling G.F. Matthews S. Silburn JET contributors
The dependence of JET neutron deficit and energy balance on neutral beam (PINI) selection has been investigated experimentally. The discrepancy between neutrons predicted and measured during JET pulses has consistently deviated, with the measured neutrons typically being lower than expected by simulation. A number of investigations into this hav…
Preprint PublishedI Turner A J T Holmes J Zacks R McAdams
A 1D model of an RF driven ion source is presented and is based on the ionisation of thermal electrons. The RF source differs from traditional filament and arc ion sources because there are no primary electrons present, and is simply composed of an antenna region (driver) and a main plasma discharge region. However the model does still make use …
Preprint PublishedIan Chapman William Morris
Fusion power could be one of very few sustainable options to replace fossil fuels as the world’s primary energy source. Fusion offers the potential of predictable, safe power with no carbon emissions, and fuel sources lasting for millions of years. However, it is notoriously difficult to achieve in a controlled, steady-state fashion. The most pro…
Preprint PublishedA. Fernandez-Caballero M. Fedorov J.S. Wrobel P.M. Mummery D. Nguyen
Configuration entropy is believed to stabilize disordered solid solution phases in multicomponent systems at elevated temperatures over intermetallic compounds by lowering the Gibbs free energy. Traditionally the …
Preprint PublishedLee Packer P. Batistoni S. C. Bradnam S. Conroy Z. Ghani M. R. Gilbert E. Laszynska I. Lengar C.R.Nobs M. Pillon S. Popovichev P. Raj I.E. Stamatelatos T. Vasilopoulou A. Wojcik-Gargula R. Worrall JET Contributors
This paper reports new activities conducted as part of the JET technology programme under the WP-JET3 ACT sub-project collaboration. The aim of the sub-project is to take advantage of the significant 14 MeV neutron fluence expected during JET operations to irradiate samples of materials that will used in the manufacturing of main ITER tokamak compo…
Preprint PublishedLeo Ma S. L. Dudarev
Formation and migration energies, elastic dipole and relaxation volume tensors of nano-defects are the parameters that determine the rates of evolution of microstructure under irradiation and the magnitude of macroscopic elastic stresses and strains resulting from the accumulation of defects in materials. To find accurate values of these parameters…
Preprint PublishedKerry Lawson K M Aggarwal, I H Coffey, F P Keenan, M G O'Mullane
Helium is widely used as a fuel or minority gas in laboratory fusion experiments, and will be present as ash in DT thermonuclear plasmas. It is therefore essential to have a good understanding of its atomic physics. To this end He II population modelling has been undertaken for the spectroscopic levels arising from shells with principal quantum…
Preprint PublishedLlion Evans L. Margetts P.D. Lee C.A.M. Butler E. Surrey
Functional materials’ properties are influenced by microstructures which can be changed during manufacturing. Experimental characterisation is often time consuming and expensive. A technique is presented which digitises graphite foam via X-ray tomography and converts it into image-based models to determine properties in silico. By simulating a la…
Preprint Publishedyiqiang wang Bin Liu Kun Yan Minshi Wang Saurabh Kabra Yu-Lung Chiu David Dye Peter D. Lee Yong Liu Biao Cai
The deformation responses at 77 and 293 K of a FeCoNiCr high-entropy alloy, produced by a powder metallurgy route, are investigated using in situ neutron diffraction and correlative transmission electron microscopy. The strength and ductility of the alloy are significant improved at cryogenic temperatures. The true ultimate tensile strengt…
Preprint PublishedLlion Evans T. Minniti M. Fursdon M. Gorley T. Barrett F. Domptail E. Surrey W. Kockelmann A.v. Müller F. Escourbiac A. Durocher
Within a tokamak fusion energy device, the performance and lifespan of a divertor monoblock under high heat flux cycles is of particular interest. Key to this is the quality of manufacture, especially the material joining interfaces. Presented here is a comparative study between X-ray and neutron tomography to investigate the quality of manufacture…
Preprint Published