Home > Publications database > Advances in understanding of high- Z material erosion and re-deposition in low- Z wall environment in DIII-D > print

001     835983
005     20240711113518.0
024 7 _ |a 10.1088/1741-4326/aa6451
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041 _ _ |a English
082 _ _ |a 530
100 1 _ |a Ding, R.
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245 _ _ |a Advances in understanding of high- Z material erosion and re-deposition in low- Z wall environment in DIII-D
260 _ _ |a Vienna
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520 _ _ |a Dedicated DIII-D experiments coupled with modeling reveal that the net erosion rate of high-Z materials, i.e. Mo and W, is strongly affected by carbon concentration in the plasma and the magnetic pre-sheath properties. Different methods such as electrical biasing and local gas injection have been investigated to control high-Z material erosion. The net erosion rate of high-Z materials is significantly reduced due to the high local re-deposition ratio. The ERO modeling shows that the local re-deposition ratio is mainly controlled by the electric field and plasma density within the magnetic pre-sheath. The net erosion can be significantly suppressed by reducing the sheath potential drop. A high carbon impurity concentration in the background plasma is also found to reduce the net erosion rate of high-Z materials. Both DIII-D experiments and modeling show that local 13CH4 injection can create a carbon coating on the metal surface. The profile of 13C deposition provides quantitative information on radial transport due to E  ×  B drift and the cross-field diffusion. The deuterium gas injection upstream of the W sample can reduce W net erosion rate by plasma perturbation. In H-mode plasmas, the measured inter-ELM W erosion rates at different radial locations are well reproduced by ERO modeling taking into account charge-state-resolved carbon ion flux in the background plasma calculated using the OEDGE code.
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700 1 _ |a Rudakov, D. L.
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700 1 _ |a Stangeby, P. C.
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700 1 _ |a Wampler, W. R.
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700 1 _ |a Abrams, T.
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700 1 _ |a Brezinsek, S.
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700 1 _ |a Briesemeister, A.
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700 1 _ |a Bykov, I.
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700 1 _ |a Chan, V. S.
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700 1 _ |a Chrobak, C. P.
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700 1 _ |a Elder, J. D.
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700 1 _ |a Guo, H. Y.
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700 1 _ |a Guterl, J.
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700 1 _ |a Kirschner, A.
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700 1 _ |a Lasnier, C. J.
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700 1 _ |a Leonard, A. W.
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700 1 _ |a Makowski, M. A.
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700 1 _ |a McLean, A. G.
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700 1 _ |a Snyder, P. B.
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700 1 _ |a Thomas, D. M.
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700 1 _ |a Tskhakaya, D.
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700 1 _ |a Unterberg, E. A.
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700 1 _ |a Wang, H. Q.
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700 1 _ |a Watkins, J. G.
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773 _ _ |a 10.1088/1741-4326/aa6451
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