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

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

Impact of nitrogen seeding on confinement and power load control of high triangularity JET ELMy H-mode plasma with a metal wall 150 150 Mathew

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

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.

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01/11/2013