A. G. Meigs

Abstract: This paper reports the impact on confinement and power load of the high-shape 2.5 MA ELMy H-mode scenario at JET of a change from all carbon plasma-facing components to an all metal wall. In preparation to this change, systematic studies of power load reduction and impact on confinement as a result of fuelling in combination with nitrogen seeding were carried out in JET-C and are compared with their counterpart in JET with a metallic wall. An unexpected and significant change is reported on the decrease in the pedestal confinement but is partially recovered with the injection of nitrogen.

TL;DR: In this paper, a detailed analysis of the plasma-facing components of the day-one tungsten divertor in ITER-like wall has been carried out, showing that the pattern of deposition within the divertor has changed significantly with respect to the JET carbon wall campaigns due to the absence of thermally activated chemical erosion of beryllium in contrast to carbon.

TL;DR: In this paper, a new technique has been developed to produce plasmas with improved confinement relative to the H-98,H-y2 scaling law on the JET tokamak.

TL;DR: In this article, the authors present the development of a region of high electron density, being one order of magnitude larger than the separatrix density, in the inner divertor of ASDEX upgrade (AUG) and JET.

TL;DR: In this paper, the authors describe a novel technique to determine the transport of impurities with different atomic numbers independently in the same discharge while minimizing the systematic errors in the spectroscopic measurements.