Showing 741 - 750 of 1892 UKAEA Paper Results
2017
CCFE-PR(17)45
X. Yi K. Arakawa D. Nguyen-Manh F. Ferroni P. Liu W. Han F. Wan S. G. Roberts
Helium bubble production in tungsten has been studied combining transmission electron microscopy and in situ irradiations with 10 keV He+ ions. The irradiations were carried out at four temperatures (773 K, 1073 K, 1273 K, 1473 K), and were held at intervals of (0.45; 0.9; 1.2; 1.5) × 1020 He+/m2 for each temperature. Based on detailed analyses of…
Preprint Published2017
CCFE-PR(17)55
I. Toda-Caraballo Jan S. Wróbel Duc Nguyen-Manh Pablo Pérez P. E. J. Rivera-Díaz-del-Castillo
High Entropy Alloys (HEAs) is a fascinating field of research, with an increasing number of new alloys discovered. This would hardly be conceivable without the aid of materials modeling and the computational alloy design to investigate the immense compositional space. The simplicity of the microstructure achieved contrasts with the enormous complex…
Preprint Purchase2016
CCFE-PR(16)81
I. Balboa S. Silburn P. Drewelow V. Huber A. Huber D. Kinna M. Price G. F. Matthews S. Collins J. Fessey M. Rack P. Trimble K.D. Zastrow
Recent improvements in software tools and methodology have allowed us to perform a more comprehensive in-vessel calibration for all mid-infrared camera systems at JET. A comparison of experimental methods to calculate the non-uniformity correction is described as well as the linearity for the different camera systems. Measurements of the temperatur…
Preprint Published2016
CCFE-PR(16)84
J. Lovell G. Naylor A. Field P. Drewelow R. Sharples JET Contributors
A new resistive bolometer system has been developed for MAST-Upgrade. It will measure radiated power in the new Super-X divertor, with millisecond time resolution, along 16 vertical and 16 horizontal lines of sight. The system uses a Xilinx Zynq-7000 series Field-Programmable Gate Array (FPGA) in the D-TACQ ACQ2106 carrier to perform real time data…
Preprint Published2016
CCFE-PR(16)25
Y. Liu S.A. Sabbagh I.T. Chapman S. Gerasimov Y. Gribov T.C. Hender V. Igochine M. Maraschek G. Matsunag M. Okabayashi E.J. Strait
The high-frequency noise measured by magnetic sensors, at levels above the typical frequency of resistive wall modes, is analyzed across a range of present tokamak devices including DIII-D, JET, MAST, ASDEX Upgrade, JT-60U, and NSTX. A high-pass filter enables identification of the noise component with Gaussian-like statistics that shares certain c…
Preprint Purchase2016
CCFE-PR(16)12
M. Fitzgerald S.E. Sharapov P. Rodrigues D. Borba
We use the HAGIS code to compute the nonlinear stability of the Q=10 ITER baseline scenario to toroidal Alfveneigenmodes (TAE) and the subsequent effects of these modes on fusion alpha-particle redistribution. Our calculations build upon an earlier linear stability survey [Rodrigues, P. et al. (2015). Nuclear Fusion, 55(8), 083003] which provides a…
Preprint Published2016
CCFE-PR(16)14
F. Militello J.T. Omotani
A theoretical framework is developed to link the density profiles in the Scrape Off Layer (SOL) with the fluctuations (filaments) that generate them. The framework is based on the dynamics of independent filaments and their statistical behaviour and can be used to rigorously understand the mechanisms that lead to attending and broadening of the SOL…
Preprint Published2016
CCFE-PR(16)82
S.C. Chapman R.O. Dendy P.T. Lang N.W. Watkins F.A. Calderon
We focus on JET plasmas in which ELMs are triggered by pellets in the presence of ELMs which occur naturally. We perform direct time domain analysis of signals from fast radial field coils and toroidal full flux azimuthal loops. These toroidally integrating signals provide simultaneous high time resolution measurements of global plasma dynamics and…
Preprint Published2016
CCFE-PR(16)79
S. Schmuck J. Fessey J. E. Boom L. Meneses P. Abreu E. Belonohy I. Lupelli
At the tokamak Joint European Torus (JET), the electron cyclotron emission spectra in O-mode and X-mode polarisations are diagnosed simultaneous in absolute terms for several harmonics with two Martin-Puplett interferometers. From the second harmonic range in X-mode polarisation, the electron temperature profile can be deduced for the outboard side…
Preprint Published2016
CCFE-PR(16)39