UKAEA Papers

"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-…

"Nonlinear wave interactions explain high-harmonic cyclotron emission from fusion-born protons during a KSTAR ELM crash"

• R O Dendy
• B Chapman
• S C Chapman
• K G McClements
• G S Yun
• S G Thatipamula
• M H Kim

During ELM crashes in deuterium plasmas in the KSTAR tokamak, the emitted electromagnetic radiation includes features with sharp spectral structure in the frequency range up to ~900MHz. Cases where the spectral peaks below ~500MHz correspond to proton cyclotron harmonics at the outer midplane edge are explained (B Chapman et al., Nucl.…

"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…

"Heat loads to the wall: the thermal conduction approach"

• M. Kovari

Calculations of the heat flux carried by plasma to the wall of a magnetic fusion machine often assume that power flows only along the field lines, but this cannot be true in general. Instead, we treat the plasma as an anisotropic non-linear thermally conducting medium. The model is physically relevant if parallel and cross-field transport are drive…

"Neoclassical flows in deuterium-helium plasma density pedestals"

• P.M.S. Buller
• I. Pusztai
• S.L. Newton
• J.T. Omotani

In tokamak transport barriers, the radial scale of profile variations can be comparable to a typical ion orbit width, which makes the coupling of the distribution function across flux surfaces important in the collisional dynamics. We use the radially global steady-state neoclassical f code Perfect to calculate poloidal and toroidal flows, and radi…