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DIFFER Publication

Integration of a radiative divertor for heat load control into JET high triangularity ELMy H-mode plasmas

Author
Abstract

Experiments on JET with a carbon-fibre composite wall have explored the reduction of steady-state power load in an ELMy H-mode scenario at high Greenwald fraction similar to 0.8, constant power and close to the L to H transition. This paper reports a systematic study of power load reduction due to the effect of fuelling in combination with seeding over a wide range of pedestal density ((4-8) x 10(19) m(-3)) with detailed documentation of divertor, pedestal and main plasma conditions, as well as a comparative study of two extrinsic impurity nitrogen and neon. It also reports the impact of steady-state power load reduction on the overall plasma behaviour, as well as possible control parameters to increase fuel purity. Conditions from attached to fully detached divertor were obtained during this study. These experiments provide reference plasmas for comparison with a future JET Be first wall and an all W divertor where the power load reduction is mandatory for operation.

Year of Publication
2012
Journal
Nuclear Fusion
Volume
52
Issue
6
Number of Pages
063022
Date Published
Jun
Type of Article
Article
ISBN Number
0029-5515
URL
http://iopscience.iop.org/0029-5515/52/6/063022/
DOI
10.1088/0029-5515/52/6/063022
PId
d05d3dd00b98af60313f317264c197dc
Alternate Journal
Nucl. Fusion
Journal Article
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