Title | Experimental investigation of neon seeding in the snowflake configuration in TCV |
Publication Type | Journal Article |
Year of Publication | 2015 |
Authors | H. Reimerdes, G.P. Canal, B.P Duval, B. Labit, T. Lunt, F. Nespoli, W.AJ Vijvers, G. De Temmerman, C. Lowry, T.W Morgan, B. Tal, M. Wischmeier |
Journal | Journal of Nuclear Materials |
Volume | 463 |
Issue | Aug |
Pagination | 1196 - 1199 |
Abstract | 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. |
DOI | 10.1016/j.jnucmat.2014.10.076 |
Division | PSI |
Department | PSI-E |
PID | 63b7dcb9922a6f29e3b3a312b56f7972 |
Alternate Title | J. Nucl. Mater. |
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