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

M.A. Berg, van den, K.E. Bystrov, R. Pasquet, J.J. Zielinski, G.C. De Temmerman

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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 ITER 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 ¿ 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.
Original languageEnglish
Pages (from-to)S431-S434
Number of pages4
JournalJournal of Nuclear Materials
Volume438
Issue numbersuppl. July
DOIs
Publication statusPublished - 2013

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