@article{7984,
  author = {H. Reimerdes and G.P. Canal and B. P. Duval and B. Labit and T. Lunt and F. Nespoli and W. A. J. Vijvers and G. De Temmerman and C. Lowry and T. W. Morgan and B. Tal and M. Wischmeier},
  title = {Experimental investigation of neon seeding in the snowflake configuration in TCV},
  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.},
  year = {2015},
  journal = {Journal of Nuclear Materials},
  volume = {463},
  pages = {1196 - 1199},
  doi = {10.1016/j.jnucmat.2014.10.076},
  note = {PLASMA-SURFACE INTERACTIONS 21 Proceedings of the 21st International Conference on Plasma-Surface Interactions in Controlled Fusion Devices Kanazawa, Japan May 26-30, 2014},
  language = {eng},
}