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.
| Original language | English |
|---|---|
| Pages (from-to) | 118-124 |
| Number of pages | 7 |
| Journal | Nuclear Materials and Energy |
| Volume | 18 |
| DOIs | |
| Publication status | Published - Jan 2019 |
Keywords
- JET-ILW
- PFC
- PSI
- Tungsten erosion
- Tungsten imaging spectroscopy
- W Divertor