Showing 21 - 30 of 1656 Journals Results
2021
UKAEA-CCFE-PR(21)24
F. Schoofs S. King A. Cackett M. Leyland C. Hardie
Small Angle Neutron Scattering (SANS) is performed to analyse the microstructural state of reference CuCrZr material with carefully controlled heat treatments, small-scale manufacturing mock-ups of assemblies and high-heat-flux exposed mock-ups. The information derived from the SANS data corresponds well to existing literature data based on microsc…
Preprint2020
C. Cowley P. Fuller Y. Andrew L. James L. Simons M. Sertoli S. Silburn A. Widdowson JET contributors
A robust impurity detection and tracking code, able to generate large sets of dust tracks from tokamak camera footage, is presented. This machine learning–based code is tested with cameras from the Joint European Torus, Doublet-III-D, and Magnum-PSI and is able to generate dust tracks with a 65–100% classification accuracy. Moreover, the number…
Published2021
UKAEA-CCFE-PR(21)23
K G McClements J Young L Garzotti O M Jones C A Michael
The work reported in this paper has already been presented internally by placement student Jacob Young at a MAST Physics and Technology meeting on December 17 2020. Therefore it does not require a paper review presentation. Please also note that the paper is proposed for inclusion in a special issue of Plasma Research Express linked to the recent I…
Preprint2021
UKAEA-CCFE-PR(21)22
M. J. Lloyd E. Martinez L. Messina D. Nguyen-Manh
In this study, radiation-induced precipitation of transmutation products is addressed via the development of a new solute and vacancy concentration dependant Ising model for the W-Re-Os system. This new model includes interactions between both Os and Re atoms, thus facilitating more representative simulations of transmutation in fusion reactor …
Preprint2021
UKAEA-CCFE-PR(21)21
M. Fitzgerald S. E. Sharapov P. Siren E. Tholerus M. Dreval G. Szepesi P. Olivares T. Jonsson N. Fil J. Ferreira P. Rodrigues A. Figueiredo D. Borba R. Coelho F. Nabais J. Mailloux H.J.C. Oliver C. Di Troia F. Napoli Z. Stancar R. Dumont D. Keeling
In this work, we use reduced and perturbative models to examine the stability of TAEs during the ITB afterglow in JET experiments designed for the observation of alpha driven TAEs. We demonstrate that in JET-like conditions, it is sufficient to use an incompressible cold plasma model for the TAE to reproduce the experimental adiabatic features su…
Preprint2021
UKAEA-CCFE-PR(21)20
Ipek Caliskanelli Matthew Goodliffe Craig Whiffin Michail Xymitoulias Edward Whittaker Swapnil Verma Craig Hickman Chen Minghao Robert Skilton
In the worlds of nuclear energy, mining, petrochemical processing, and sub-sea, robots are being used for an increasing number and range of tasks. This is resulting in ever more complex robotics installations being deployed, maintained, and extended over long periods of time. Additionally, the unstructured, experimental, or unknown operational c…
Preprint Purchase2018
W. Suttrop A. Kirk V. Bobkov M. Cavedon M. Dunne R.M. McDermott H. Meyer R. Nazikian C. Paz-Soldan D.A. Ryan E. Viezzer M. Willensdorfer The ASDEX Upgrade MST1 Teams
Access conditions for full suppression of edge localised modes (ELMs) by magnetic perturbations (MP) in low density high confinement mode (H-mode) plasmas are studied in the ASDEX Upgrade tokamak. The main empirical requirements for full ELM suppression in our experiments are: 1. The poloidal spectrum of the MP must be aligned for best plasma respo…
Published2018
UKAEA-RACE-PR(21)05
S. Kirk K. Keogh
The maintenance and decommissioning of nuclear reactors requires the rapid cutting and welding of thick-walled pipework, to which laser processing is highly suited. However, the large size and stand-off of current laser heads precludes their use in space constrained areas and incorporation into in-bore processing tools. To address this, novel minia…
Preprint Published2019
I. Jepu G.F. Matthews A. Widdowson M. Rubel E. Fortuna-Zaleśna J. Zdunek P. Petersson V. Thompson P. Dinca C. Porosnicu P. Coad K. Heinola N. Catarino O.G. Pompilian C. P. Lungu JET Contributors
Data on erosion and melting of beryllium upper limiter tiles, so-called dump plates (DP), are presented for all three campaigns in the JET tokamak with the ITER-like wall. High-resolution images of the upper wall of JET show clear signs of flash melting on the ridge of the roof-shaped tiles. The melt layers move in the poloidal direction from the i…
Published2021
UKAEA-CCFE-PR(21)19