Determination of tungsten sources in the JET-ILW divertor by spectroscopic imaging in the presence of a strong plasma continuum

Huber, Alexander; Sergienko, G.; Douai, D.; Ström, P.; Borodkina, Irina; Kirschner, A.; Linsmeier, C. h.; Lomanowski, B.; Jachmich, S.; Matthews, G. F.; Brezinsek, S.; Mertens, P. h.

doi:10.1016/j.nme.2018.12.009

Journal Article

FZJ-2019-04072

Determination of tungsten sources in the JET-ILW divertor by spectroscopic imaging in the presence of a strong plasma continuum

Huber, A. (Corresponding author)FZJ* ; Brezinsek, S.FZJ* ; Kirschner, A.FZJ* ; Ström, P. ; Sergienko, G.FZJ* ; Borodkina, I. ; Douai, D. ; Jachmich, S.FZJ* ; Linsmeier, C. h.FZJ* ; Lomanowski, B.FZJ* ; Matthews, G. F. ; Mertens, P. h.FZJ*

2019
Elsevier Amsterdam [u.a.]

Nuclear materials and energy 18, 118 - 124 (2019) [10.1016/j.nme.2018.12.009]

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Please use a persistent id in citations: http://hdl.handle.net/2128/22567 doi:10.1016/j.nme.2018.12.009

Abstract: The identification of the sources of atomic tungsten and the measurement of their radiation distribution in front of all plasma-facing components has been performed in JET with the help of two digital cameras with the same two-dimensional view, equipped with interference filters of different bandwidths centred on the W I (400.88 nm) emission line. A new algorithm for the subtraction of the continuum radiation was successfully developed and is now used to evaluate the W erosion even in the inner divertor region where the strong recombination emission is dominating over the tungsten emission. Analysis of W sputtering and W redistribution in the divertor by video imaging spectroscopy with high spatial resolution for three different magnetic configurations was performed. A strong variation of the emission of the neutral tungsten in toroidal direction and corresponding W erosion has been observed. It correlates strongly with the wetted area with a maximal W erosion at the edge of the divertor tile.

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