Hauptseite > Publikationsdatenbank > Plasma-surface interaction in the Be/W environment: Conclusions drawn from the JET-ILW for ITER > print

001     202205
005     20240711113734.0
024 7 _ |a 10.1016/j.jnucmat.2014.12.007
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037 _ _ |a FZJ-2015-04494
082 _ _ |a 530
100 1 _ |a Brezinsek, Sebastijan
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245 _ _ |a Plasma-surface interaction in the Be/W environment: Conclusions drawn from the JET-ILW for ITER
260 _ _ |a Amsterdam [u.a.]
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336 7 _ |a Journal Article
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520 _ _ |a The JET ITER-Like Wall experiment (JET-ILW) provides an ideal test bed to investigate plasma-surface interaction (PSI) and plasma operation with the ITER plasma-facing material selection employing beryllium in the main chamber and tungsten in the divertor. The main PSI processes: material erosion and migration, (b) fuel recycling and retention, (c) impurity concentration and radiation have be1en studied and compared between JET-C and JET-ILW. The current physics understanding of these key processes in the JET-ILW revealed that both interpretation of previously obtained carbon results (JET-C) and predictions to ITER need to be revisited. The impact of the first-wall material on the plasma was underestimated.Main observations are: (a) low primary erosion source in H-mode plasmas and reduction of the material migration from the main chamber to the divertor (View the MathML sourcefactor7) as well as within the divertor from plasma-facing to remote areas (View the MathML sourcefactor30-50). The energetic threshold for beryllium sputtering minimises the primary erosion source and inhibits multi-step re-erosion in the divertor. The physical sputtering yield of tungsten is low as 10-510-5 and determined by beryllium ions. (b) Reduction of the long-term fuel retention (View the MathML sourcefactor10-20) in JET-ILW with respect to JET-C. The remaining retention is caused by implantation and co-deposition with beryllium and residual impurities. Outgassing has gained importance and impacts on the recycling properties of beryllium and tungsten. (c) The low effective plasma charge (Zeff=1.2Zeff=1.2) and low radiation capability of beryllium reveal the bare deuterium plasma physics. Moderate nitrogen seeding, reaching Zeff=1.6Zeff=1.6, restores in particular the confinement and the L-H threshold behaviour. ITER-compatible divertor conditions with stable semi-detachment were obtained owing to a higher density limit with ILW. Overall JET demonstrated successful plasma operation in the Be/W material combination and confirms its advantageous PSI behaviour and gives strong support to the ITER material selection.
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