@article{7720,
  author = {M. A. van den Berg and K. Bystrov and R. Pasquet and J. J. Zielinski and G. De Temmerman},
  title = {Thermographic determination of the sheath heat transmission coefficient in a high density plasma},
  abstract = {Experiments were performed in the Pilot-PSI linear plasma device, to determine the sheath heat transmission coefficients in a high recycling regime under various conditions of density (1–20 × 1020 m−3) and plasma composition (H2, Ar, N2) relevant for the İTER\} divertor plasma. The 2D surface temperature profile on a tungsten surface was measured with high spatial (0.33 mm) and temporal (200 Hz) resolution using an infrared camera. The target heat flux is calculated using a 2D axis-symmetric Ansys model, the heat transfer is determined from target calorimetry. The plasma parameters are measured with a high resolution Thomson scattering system located 17 mm away from the target surface. Radial profiles of the sheath heat transmission factors can thus be determined. Preliminary results show that γ varies between 4 and 40 depending on the plasma conditions and composition. The value derived from the heat flux calculated with Ansys is significantly lower than theory predicts.
},
  year = {2013},
  journal = {Journal of Nuclear Materials},
  volume = {438, Supplement},
  pages = {S431 - S434},
  doi = {10.1016/j.jnucmat.2013.01.087},
  note = {Proceedings of the 20th International Conference on Plasma-Surface Interactions in Controlled Fusion Devices},
  language = {eng},
}