UKAEA Journals

Showing 1 - 10 of 16 Journals Results
2020
UKAEA-CCFE-PR(20)81
"Deformation heterogeneity in laser-welded Eurofer"

Allan HarteHuw DawsonDavid BowdenSimon KirkMike Gorley

The suitability of post-weld heat treatments are often measured in terms of reducing residual stress and/or ensuring hardness homogeneity. Here we use detailed digital image correlation to quantify the localised deformation behaviour of laser welded Eurofer-97 both with and without a normalising and tempering treatment. This is coupled with detaile…

Preprint Published
The published version of this paper is currently under embargo and will be available on 26/09/2022
2019
UKAEA-CCFE-PR(20)02
"Slip band characteristics in the presence of grain boundaries in nickel-based superalloy"

Ryan Sperry David T Fullwood Allan Harte Joao Quinta da Fonseca Eric R Homer Robert H Wagoner

Shear strain profiles along slip bands in a modified Rolls-Royce nickel superalloy (RR1000) were analyzed for tensile sample deformed by 2%. The strain increased with distance away from a grain boundary (GB), with maximum shear strain towards the center of the grain, indicating that dislocation nucleation generally occurred in the grain interior. T…

Preprint Purchase
2019
UKAEA-CCFE-PR(20)01
"Novel Methods for Recording Stress-Strain Curves in Proton Irradiated Material"

Albert D. Smith Jack M. Donoghue Alistair J.W. Garner David Lunt Allan Harte Keith Wilford Philip J. Withers Michael Preuss

Proton irradiation is often used as a proxy for neutron irradiation but the irradiated layer is typically

Preprint
2019
UKAEA-CCFE-PR(19)19
"Quantum and Classical Monte Carlo Study of Lithium Oxide"

Mikhail Lavrentiev N.L. Allan C. Wragg

Extensive Monte Carlo simulations of lithium oxide, Li2O, an important material for fusion applications over a wide range of temperatures have been performed. In the low temperature range 1 – 500 K, quantum corrections to the enthalpy and unit cell size were determined. We show that the classical Monte Carlo underestimates both these q…

Preprint Published
2016
CCFE-PR(16)27
"Ion Temperature Measurements of L-mode Filaments in MAST by Retarding Field Energy Analyser"

S.Y. Allan S. Elmore G. Fishpool B. Dudson The MAST Team The EUROFusion MST1 Team

Retarding field energy analysers (RFEAs) have been used to compare the ion temperature ( T i ) of large plasma filaments with the background plasma (composed of small scale filaments) at the midplane and divertor target in L mode discharges in the Mega Amp Spherical Tokamak (MAST). At low densities, at the midplane and divertor, at distances from 2…

Preprint Published
2016
CCFE-PR(16)30
"Scrape-off Layer Ion Temperature Measurements at the Divertor Target During Type III and Type I ELMs in MAST Measured by RFEA"

S. Elmore S.Y. Allan G. Fishpool A. Kirk A.J. Thornton N.R. Walkden J.R. Harrison The MAST Team

In future nuclear fusion reactors high heat load events, such as edge-localised modes (ELMs), can potentially damage divertor materials and release impurities into the main plasma, limiting plasma performance. The most difficult to handle are type I ELMs since they carry the largest fraction of energy from the plasma and therefore deposit the large…

Preprint Published
2015
"Perovskite solid solutions -– a Monte Carlo study of the deep Earth analogue (K, Na)MgF3"

C. Tealdi M.Y. Lavrentiev C.E. Mohn N.L. Allan

Understanding the behaviour of solid solutions over wide ranges of temperature and pressure remains a major challenge to both theory and experiment. Here we report a detailed exchange Monte Carlo study using a classical ionic model of the model perovskite parascandolaite-neighborite (K,Na)MgF3 solid solution and its end-members for temperatures in …

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2015
CCFE-PR(15)52
"SOLPS Analysis of the MAST-U Divertor with the Effect of Heating Power and Pumping on the Access to Detachment in the Super-X Configuration"

E. Havlíčková J. Harrison B. Lipschultz G. Fishpool A. Kirk A. Thornton M. Wischmeier S. Elmore S. Allan

SOLPS simulations of MAST-U have been carried out to identify in more detail the physics and operational properties of novel divertor configurations such as Super-X divertor (SXD), in particular the physics of detachment. A well diagnosed L-mode discharge from MAST has been utilised to determine L-mode transport coefficients representative for MAST…

Preprint Published
2015
CCFE-PR(15)20
"Scrape-off Layer Ion Temperature Measurements at the Divertor Target During Type III ELMs in MAST Measured by RFEA"

S. Elmore S.Y. Allan G. Fishpool A. Kirk M. Kocan P. Tamain A.J. Thornton The MAST Team

Edge-localised modes (ELMs) can carry significant fractions of their energy as far as main chamber plasma-facing components in divertor tokamaks. Since in future devices (e.g. ITER, DEMO) these energies could cause issues for material lifetime and impurity production, the energy and temperature of ions in ELMs needs to be investigated. In MAST, nov…

Preprint Published
2015
CCFE-PR(15)125
"Profile measurements in the plasma edge of mega amp spherical tokamak using a ball pen probe"

N.R. Walkden J. Adamek S. Allan B. D. Dudson S. Elmore G. Fishpool J. Harrison A. Kirk M. Komm

The ball pen probe (BPP) technique is used successfully to make profile measurements of plasma potential, electron temperature, and radial electric field on the Mega Amp Spherical Tokamak. The potential profile measured by the BPP is shown to significantly differ from the floating potential both in polarity and profile shape. By combining the BPP p…

Preprint Published