Determination of tungsten sources in the JET-ILW divertor by spectroscopic imaging in the presence of a strong plasma continuum
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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Date
2019-01-01
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Language
en
Pages
7
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Nuclear Materials and Energy, Volume 18, pp. 118-124
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.Description
| openaire: EC/H2020/633053/EU//EUROfusion
Keywords
JET-ILW, PFC, PSI, Tungsten erosion, Tungsten imaging spectroscopy, W Divertor
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Citation
Huber, A, Brezinsek, S, Kirschner, A, Ström, P, Sergienko, G, Huber, V, Borodkina, I, Douai, D, Jachmich, S, Linsmeier, C H, Lomanowski, B, Matthews, G F, Mertens, P H & JET Contributors 2019, ' Determination of tungsten sources in the JET-ILW divertor by spectroscopic imaging in the presence of a strong plasma continuum ', Nuclear Materials and Energy, vol. 18, pp. 118-124 . https://doi.org/10.1016/j.nme.2018.12.009