DIFFER
DIFFER Publication

Thermographic determination of the sheath heat transmission coefficient in a high density plasma

Author
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 of Publication
2013
Journal
Journal of Nuclear Materials
Volume
438, Supplement
Number of Pages
S431 - S434
DOI
10.1016/j.jnucmat.2013.01.087
PId
c26fccd9f49a81e3a3445130800d5f94
Alternate Journal
J. Nucl. Mater.
Label
OA
Attachment
Journal Article
Download citation