Impact of nitrogen seeding on confinement and power load control of a high-triangularity JET ELMy H-mode plasma with a metal wall

Abstract

This paper reports the impact on confinement and power load of the high-shape 2.5MA ELMy H-mode scenario at JET of a change from an 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 to their counterpart in JET with a metallic wall. An unexpected and significant change is reported on the decrease of the pedestal confinement but is partially recovered with the injection of nitrogen.

30 pages, 16 figures

References in corpus (1)

• Deuterium Balmer/Stark spectroscopy and impurity profiles: first results from mirror-link divertor spectroscopy system on the JET ITER-like wall

Cited by in corpus (5)

• Improved Confinement in JET High {beta} Plasmas with an ITER-Like Wall
• Direct Gyrokinetic Comparison of Pedestal Transport in JET with Carbon and ITER-Like Walls
• Contrasting H-mode behaviour with deuterium fuelling and nitrogen seeding in the all-carbon and metallic versions of JET
• Gas Analyses of First complete JET Cryopump Regeneration with ITER-Like Wall
• Stabilizing effect of enhanced resistivity on peeling-ballooning instabilities on EAST