UKAEA Papers

"Characterisation of MX Precipitate Density and Irradiation Hardening in Advanced Reduced-Activation Ferritic-Martensitic Fusion Steels"

• James S.K-L. Gibson
• Alex Carruthers
• Benjamin R. S. Evans
• Jack Haley
• Slava Kuksenko
• Kay Song
• Luke Hewitt
• Stephen Jones
• Shahin Mehraban
• Nicholas Lavery
• David Bowden

Reduced activation ferritic-martensitic (RAFM) steels are a recent class of radiation-resistant steels designed for the structural components of power-producing fusion reactors. In this work an advanced (A)RAFM steel has been developed with superior radiation hardening resistance with respect to the EUROFER-97 upon which it was based. 4D-STEM (s…

"Stiff‑PDEs and Physics‑Informed Neural Networks"

• Prakhar Sharma
• Llion Evans
• Michelle Tindall
• Perumal Nithiarasu

In recent years, physics-informed neural networks (PINN) have been used to solve stiff-PDEs mostly in the 1D and 2D spatial domain. PINNs still experience issues solving 3D problems, especially, problems with conflicting boundary conditions at adjacent edges and corners. These problems have discontinuous solutions at edges and corners that are di…

"Structural integrity of DEMO divertor target assessed by neutron tomography"

• Triestino Minniti
• Frank Schoofs
• Llion Marc Evans
• Winfried Kockelmann
• J.H. You
• Heather Lewtas

The divertor target plates are the most exposed in-vessel components to high heat flux loads in a fusion reactor due to a combination of plasma bombardment, radiation and nuclear heating. Reliable exhaust systems of such a huge thermal power required a robust and durable divertor target with a sufficiently large heat removal capability and lifetime…

"Light scattering by plasmas"

• TJM Boyd
• DE Evans
• J Katzenstein

"Asymmetric co-operative scattered light spectrum in a thetatron plasma"

• DE Evans
• MJ Forrest
• J Katzenstein

"Co-operative scattering of laser light by a thetatron plasma"

• DE Evans
• MJ Forrest
• J Katzenstein

"Observation of thomson and co-operative scattering of ruby laser light by a plasma"

• AW DeSilva
• DE Evans
• MJ Forrest

"Virtual qualification of novel heat exchanger components with the image-based finite element method"

• Llion M. Evans
• T. Minniti
• T. Barrett
• A. von Muller
• L. Margetts

This paper presents the application of the image-based finite element method (IBFEM) to quantify the impact of micro-structure caused by manufacturing processes on the performance of fusion energy heat exchangers. The components, containing tungsten, were imaged with high-power lab-based X-ray CT and neutron CT. Volume data was converted into part-…

"Image based in silico characterisation of the effective thermal properties of a graphite foam"

• Llion 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…

"Comparison of X-ray and neutron tomographic imaging to qualify manufacturing of a fusion divertor tungsten monoblock"

• Llion 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…