Self-shielding of a plasma-exposed surface during extreme transient heatloads

J.J. Zielinski; H.J. Meiden, van der; T.W. Morgan; M.H.J. 't Hoen; D.C. Schram; G.C. De Temmerman

doi:10.1063/1.4869486

Self-shielding of a plasma-exposed surface during extreme transient heatloads

J.J. Zielinski, H.J. Meiden, van der, T.W. Morgan, M.H.J. 't Hoen, D.C. Schram, G.C. De Temmerman

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Abstract

The power deposition on a tungsten surface exposed to combined pulsed/continuous high power plasma is studied. A study of the correlation between the plasma parameters and the power deposition on the surface demonstrates the effect of particle recycling in the strongly coupled regime. Upon increasing the input power to the plasma source, the energy density to the target first increases then decreases. We suggest that the sudden outgassing of hydrogen particles from the target and their subsequent ionization causes this. This back-flow of neutrals impedes the power transfer to the target, providing a shielding of the metal surface from the intense plasma flux.

Original language	English
Article number	124102
Number of pages	5
Journal	Applied Physics Letters
Volume	104
DOIs	https://doi.org/10.1063/1.4869486
Publication status	Published - 2014

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title = "Self-shielding of a plasma-exposed surface during extreme transient heatloads",

abstract = "The power deposition on a tungsten surface exposed to combined pulsed/continuous high power plasma is studied. A study of the correlation between the plasma parameters and the power deposition on the surface demonstrates the effect of particle recycling in the strongly coupled regime. Upon increasing the input power to the plasma source, the energy density to the target first increases then decreases. We suggest that the sudden outgassing of hydrogen particles from the target and their subsequent ionization causes this. This back-flow of neutrals impedes the power transfer to the target, providing a shielding of the metal surface from the intense plasma flux.",

author = "J.J. Zielinski and {Meiden, van der}, H.J. and T.W. Morgan and {'t Hoen}, M.H.J. and D.C. Schram and {De Temmerman}, G.C.",

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AU - Zielinski, J.J.

AU - Meiden, van der, H.J.

AU - Morgan, T.W.

AU - 't Hoen, M.H.J.

AU - Schram, D.C.

AU - De Temmerman, G.C.

PY - 2014

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N2 - The power deposition on a tungsten surface exposed to combined pulsed/continuous high power plasma is studied. A study of the correlation between the plasma parameters and the power deposition on the surface demonstrates the effect of particle recycling in the strongly coupled regime. Upon increasing the input power to the plasma source, the energy density to the target first increases then decreases. We suggest that the sudden outgassing of hydrogen particles from the target and their subsequent ionization causes this. This back-flow of neutrals impedes the power transfer to the target, providing a shielding of the metal surface from the intense plasma flux.

AB - The power deposition on a tungsten surface exposed to combined pulsed/continuous high power plasma is studied. A study of the correlation between the plasma parameters and the power deposition on the surface demonstrates the effect of particle recycling in the strongly coupled regime. Upon increasing the input power to the plasma source, the energy density to the target first increases then decreases. We suggest that the sudden outgassing of hydrogen particles from the target and their subsequent ionization causes this. This back-flow of neutrals impedes the power transfer to the target, providing a shielding of the metal surface from the intense plasma flux.

U2 - 10.1063/1.4869486

DO - 10.1063/1.4869486

M3 - Article

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JO - Applied Physics Letters

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