Guoqiang Liu D. Nguyen-Manh Bang-Gui Liu D. G. Pettifor
The tight-binding Stoner model of band magnetism is generalized to account for local charge neutrality by working within the tight-binding-bond s TBB d representation of the binding energy. We show that the analytic forces within this TBB Stoner model take a very simple form because neither the renormalization in the on-site energies due to local c…
PublishedD. A. Pankhurst Z. Yuan D. Nguyen-Manh M.-L. Abel G. Shao J. F. Watts D. G. Pettifor P. Tsakiropoulos
We have investigated the electronic structure of MoSi2, Mo5Si3, Mo3Si, and Mo(Si1−xAlx)2 alloys at a range of x values using a combination of valence-band x-ray photoelectron spectroscopy sVBXPSd and densityfunctional theory. We find good agreement between the experimental spectra and the calculated total densities of states. The observed differe…
PublishedR. Pampin P. J. Karditsas
The HERCULES code was designed and developed to assist in the safety and environmental analysis tasks of the European Power Plant Conceptual Study (PPCS). However, its capabilities extend beyond this kind of analysis: coupling of the different computational tools and nuclear databases to the same geometry and material compositions, automation of in…
PublishedR.K. Galloway A.L. Mackinnon E.P. Kontar P. Helander
Finite thermal velocity modifications to electron slowing-down rates may be important for the deduction of solar flare total electron energy. Here we treat both slowing-down and velocity diffusion of electrons in the corona at flare temperatures, for the case of a simple, spatially homogeneous source. Including velocity diffusion yields a consisten…
PublishedF.B. Rosemej R. Stamm S. Fritzsche N. Yamamoto T. Kato M. Goto H. Capes M. Koubiti V.S. Lisitsa A. Meigs N. Ohno S. Takamura D. Nishijima U.I. Safronova E. Lindroth
The analysis of equilibrium conditions might be irrelevant to determine the importance of a certain set of atomic data. We show, that in non-equilibrium and optically thick plasmas intercombination transitions between highly excited states as well as higher order dielectronic satellite transitions are of extraordinary importance for diagnostics. In…
PublishedR. A. Forrest P. Bém J. Kopecky U. Von Möllendorff M. Pillon et al.
The European Activation File is the source of nuclear data for fusion activation calculations that has been developed in Europe. In order to trust the calculations made with the data, validation is essential. A key part of this is the comparison of the EAF data with integral experiments made in fusion relevant neutron spectra on a wide range of mat…
PublishedR. A. Forrest
The current version of the European Activation File is EAF-2003. This contains various libraries of nuclear data required for activation calculations. An important component is the neutron-induced cross-section library. Plans to expose fusion components to high neutron fluxes include the IFMIF materials testing facility. This accelerator-based devi…
PublishedU. Fischer P. Batistoni E. Cheng R. A. Forrest T. Nishitani
The current status of nuclear data evaluations for fusion technologies is reviewed. Well-qualified data are available for neutronics and activation calculations of fusion power reactors and the next-step device ITER, the International Thermonuclear Experimental Reactor. Major challenges for the further development of fusion nuclear data arise from …
PublishedC. Silva B. Gonçalves C. Hidalgo M. A. Pedrosa K. Erents G. Matthews R. A. Pitts
A multi-probe system has been developed to investigate the importance of electron temperature fluctuations turbulent transport in the Joint European Torus boundary plasma. The compact five-pin triple probe has been designed to reduce the phase delay of fluctuations due to the finite pin separation in the standard triple probe technique, while still…
PublishedD. R. Mccarthy C. N. Lashmore-Davies A. Thyagaraja
The generalized Charney-Hasegawa-Mima equation is unstable to a four wave modulational instability whereby a coherent, monochromatic drift wave can drive a band of modes and associated zonal flows unstable. Although initially the fastest growing modes dominate, a secondary nonlinear instability later drives the longest wavelength zonal flow and its…
Published