Journal
JOURNAL OF NUCLEAR MATERIALS
Volume 463, Issue -, Pages 1196-1199Publisher
ELSEVIER
DOI: 10.1016/j.jnucmat.2014.10.076
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Funding
- Fonds National Suisse de la Recherche Scientifique
- EURATOM
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Recent TCV experiments have examined the effect of the poloidal field strength in the vicinity of the x-point of diverted configurations on their ability to radiate a large fraction of the exhaust power. A larger region of low poloidal field is a key characteristic of the snowflake configuration, which has been proposed as an alternative divertor solution that decreases the power flux to the targets in a DEMO-size tokamak. In the investigated Ohmic discharges, increasing the plasma density and seeding neon both increased the radiated exhaust fraction up to 60-70%. In all cases, the highest radiation fraction was determined by the onset of MHD rather than a radiation instability. The experiments indicate that, while the conventional single-null configuration leads to more radiation (+10%) at higher densities, the snowflake configuration radiates more when seeding neon impurities (+15%). Extrapolation of these modest, but systematic, dependencies on the divertor geometry to reactor-relevant higher heating power and larger device size must be based on a physics model. (C) 2014 Elsevier B.V. All rights reserved.
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