Showing 991 - 1000 of 1656 Journals Results
2012
C. Thomser V. Bailescu S. Brezinsek J. W. Coenen H. Greuner T. Hirai J. Linke C. P. Lungu H. Maier G. Matthews Ph. Mertens R. Neu V. Philipps V. Riccardo M. Rubel C. Ruset A. Schmidt I. Uytdenhouwen JET EFDA Contributors
The chosen materials for plasma facing components for the deuterium/tritium phase of ITER are beryllium and tungsten. These materials have already been widely investigated in various devices like ion beam or electron beam tests. However, the operation of this material combination in a large tokamak including plasma wall interaction, material degrad…
Published2012
Yueqiang Liu J. W. Connor S. C. Cowley C. J. Ham R. J. Hastie et al.
Within the single fluid theory for a toroidal, resistive plasma, the favorable average curvature effect [Glasser et al. , Phys. Fluids 18 , 875 (1975)], which is responsible for the strong stabilization of the classical tearing mode at finite pressure, can also introduce a strong screening effect to the externally applied resonant magnetic field. C…
Published2012
D. Dickinson C. M. Roach S. Saarelma R. Scannell A. Kirk H. R. Wilson
Plasma equilibria reconstructed from the Mega-Amp Spherical Tokamak have sufficient resolution to capture plasma evolution during the short period between edge-localized modes (ELMs). Immediately after the ELM, steep gradients in pressure, P , and density, n e , form pedestals close to the separatrix, and they then expand into the core. Local gyrok…
Published2012
M. Gherendi V. L. Zoita T. Craciunescu M. Gatu Johnson A. Pantea et al.
The neutron field parameters (fluence and energy distribution) at a specific location outside the JET Torus Hall have been measured by means of super-heated fluid detectors (or “bubble detectors”) in combination with an independent, time-of-flight, technique. The bubble detector assemblies were placed at the end of a vertical line of sight at a…
Published2012
S. Saarelma T. Casper I.T. Chapman G.T.A. Huijsmans O. Kwon J. Lee A. Loarte
A stability analysis using equilibria from CORSICA transport simulations finds that the maximum stable pedestal pressure in ITER 15 MA baseline plasma is 110 kPa corresponding to a pedestal temperature of 5.9 keV. The height of the stable pedestal is robust for the assumption of the pedestal height varying only by about 10% if the width of the pede…
Published2012
D. Alves R. Felton S. Jachmich P. Lomas P. Mccullen A. Neto D. F. Valcárcel G. Arnoux P. Card S. Devaux A. Goodyear D. Kinna A. Stephen K.-D. Zastrow
The installation of international thermonuclear experimental reactor-relevant materials for the plasma facing components (PFCs) in the Joint European Torus (JET) is expected to have a strong impact on the operation and protection of the experiment. In particular, the use of all-beryllium tiles, which deteriorate at a substantially lower temperature…
Published2012
E. G. Highcock A. A. Schekochihin S. C. Cowley M. Barnes F. I. Parra C. M. Roach W. Dorland
Sheared toroidal flows can cause bifurcations to zero-turbulent-transport states in tokamak plasmas. The maximum temperature gradients that can be reached are limited by subcritical turbulence driven by the parallel velocity gradient. Here it is shown that magnetic field pitch/inverse aspect ratio is a critical control parameter for sheared tokamak…
Published2012
M.P. Gryaznevich A. Sykes D Kingham B. Mcnamara G. Voss B.V. Kuteev A.Yu. Dnestrovskii A.A.Golikov
The new approach in advancing the use of fusion, “Fusion for Neutrons” (F4N), is proposed. The application of a small or medium size Spherical Tokamak (ST) as a powerful steady-state fusion neutron source (FNS) is discussed. An overview of various conceptual designs of such neutron sources is given and they are compared with a recently proposed…
Published2012