Beth Thomas

Spectroscopic observations of opacity in JET He discharges

K. Lawson, I. Coffey, M. Groth, A. Meigs et autres

Abstract An understanding of the occurrence of opacity is important for modelling the power exhaust of magnetic confinement fusion plasmas. The absorption and reemission of radiation alters the magnitude and distribution of radiation within the divertor of the fusion machines, the plasma …

gb, fi (code pays fourni par la source)

E r measurements in JET L-mode plasmas for a wide range of densities—from the low-recycling regime up to the density limit

C. Silva, M. Groth, S. Aleiferis, P. Carvalho et autres

Abstract This study investigates the dependence of the radial electric field (E r) on the line-averaged density in JET L-mode plasmas, utilizing Doppler backscattering measurements. Density ramp discharges up to the density limit are analyzed to investigate the physical processes that determine …

fi (code pays fourni par la source)

Comparison of the scrape‐off layer two‐point model for deuterium and helium plasmas in JET ITER‐like wall low‐confinement plasma conditions

David Rees, Joona Sissonen, M. Groth, Vesa‐Pekka Rikala et autres

Abstract The hydrogenic two‐point model (H‐2PM), an analytical model for the scrape‐off layer that predicts a common electron and ion temperature and density along a flux tube from a target temperature and density, is adapted to a single‐species helium (He) model, preserving …

fi, gb (code pays fourni par la source)

Tungsten Langmuir probes from JET-with the ITER-Like Wall: Assessment of mechanical properties by nano-indentation

Maciej Spychalski, E. Fortuna-Zaleśna, Joanna Zdunek, M. Rubel et autres

Abstract Tungsten Langmuir probes retrieved from the JET tokamak with the ITER-Like Wall (JET-ILW) after the second ILW campaign were examined by nano-indentation, microscopy and x-ray diffraction in order to determine changes in mechanical properties and phase composition. Not-exposed probe served as …

pl, se, gb (code pays fourni par la source)

Étude des mécanismes de déformation et d’adoucissement dynamique des aciers ferritiques Fe-Cr au cours de la déformation à chaud

R. Lombry, C. Rossard, Beth Thomas