Published in Nuclear Fusion
The influence of upstream ion temperature in the scrape-off layer (SOL) on the tungsten (W) sputtering in the divertor is studied in the WEST tokamak. For an almost constant power into the SOL, the upstream ion temperature and its ratio over the electron temperature gradually increase with the decrease of electron density in the SOL. This increment...
Published in Nuclear Fusion
The formation of the radial electric field, Er in the scrape-off layer (SOL) has been experimentally studied for attached divertor conditions in stellarator W7-X. The main objective of this study is to test the validity in a complex three-dimensional (3D) island divertor of simple models, typically developed in tokamaks, relating Er in the SOL to t...
For an energy mix, the mastery of nuclear fusion offers the opportunity for a abundant and renewable source of energy. The tokamaks showed the best performance for confining a fusion plasma using magnetic fields and were chosen as the next generation of machines for research in fusion (ITER). The evacuation of heat flows and the increase in the tim...
Published in Nuclear Fusion
A new gas puff imaging diagnostic has been installed on the TCV tokamak, providing two-dimensional insights into scrape-off-layer (SOL) turbulence dynamics above, at and below the magnetic X-point. A detailed study in L-mode, attached, lower single-null discharges shows that statistical properties have little poloidal variations, while vast differe...
Published in Plasma Physics and Controlled Fusion
The Kinetic Code for Plasma Periphery (KIPP) models parallel (along magnetic field lines) propagation of charged particles in the scrape-off layer (SOL) and divertor of tokamaks. An iterative coupling between KIPP and a 2D edge fluid code EDGE2D, which in turn is coupled to the Monte-Carlo solver EIRENE for neutrals, was used to achieve a converged...
Published in Nuclear Fusion
As tokamak research moves to reactor conditions, the control of a stable, optimally-detached divertor plasma has become increasingly relevant. Simple predictions of such detachment control have been performed previously using the detachment location sensitivity (DLS) model (Lipschultz et al 2016 Nucl. Fusion 56 056007). In this study the DLS model ...
The main aim of this work is to assess the realistic heat loads on the first wall of the JT-60SA vessel. To achieve this scope, for the first time the entire vessel and the subdivertor region is modeled by the fluid transport code SOLEDGE-EIRENE . Whereas the full scenario modeling was reported elsewhere here we focus on the initial phase of scenar...
Les digues et barrages comprennent souvent des éléments en sols fins (argile et/ou limon) qui sont sensibles à l’environnement hydrique atmosphérique de l’ouvrage. Suivant la teneur en eau initiale et la densité sèche initiale, des fissures de retrait peuvent apparaitre en période sèche en climat tempéré. Leur profondeur est limitée, sachant que l’...
Durability of lime-treated earthen structures is governed by the hydromechanical performances of the soil. However, fewer studies address the influence of pore solution's chemistry on the mechanism governing the hydraulic and microstructural evolution of the materials. The hydraulic and leaching performances of lime-treated soil, compacted by knead...
Durability of lime-treated earthen structures is governed by the hydromechanical performances of the soil. However, fewer studies address the influence of pore solution's chemistry on the mechanism governing the hydraulic and microstructural evolution of the materials. The hydraulic and leaching performances of lime-treated soil, compacted by knead...
