|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|
|Pagination||1196 - 1199|
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.
|Alternate Title||J. Nucl. Mater.|
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