@article{7849,
  author = {K. Bystrov and L. B. van der Vegt and G. A. van Swaaij and T. Zaharia and Y. Kuang and W. J. Goedheer and G. De Temmerman},
  title = {Carbon migration during methane injection experiments under ITER divertor-relevant conditions},
  abstract = {Methane was injected into a high density low temperature hydrogen plasma beam (ne ⩽ 1021 m−3, Te ∼ 1 eV) in Pilot-PSI to study carbon transport and provide a benchmark case for modeling. Gas injection was performed through molybdenum samples that acted as collectors of redeposits. The CH A–X band emission plumes are localized near the injection hole with a typical width of ∼3 mm and a decay length of ∼1.5 mm. The geometry of the emission profile is not influenced by the electron temperature. The redeposition efficiency and codeposit structure depend on the surface temperature. Surface temperatures below 500 K promote growth of a-C:H films across the surface and lead to redeposition of up to 38% of injected carbon. Above 800 K the redeposition efficiency decreases strongly and carbon microparticles are found near the injection hole.
},
  year = {2013},
  journal = {Journal of Nuclear Materials},
  volume = {438, Supplement},
  pages = {S686 - S689},
  doi = {10.1016/j.jnucmat.2013.01.145},
  note = {Proceedings of the 20th International Conference on Plasma-Surface Interactions in Controlled Fusion Devices},
  language = {eng},
}