Advances in the modeling of chemical erosion/redeposition of carbon divertors and application to the JET tritium codeposition problem

J. N. Brooks, A. Kirschner, D. G. Whyte, D. N. Ruzic, D. A. Alman

Research output: Contribution to journalConference article

Abstract

We have improved the modeling of chemically eroded carbon transport and applied this to JET and ITER. New features are: (1) coupled REDEP and ERO-JET impurity transport code calculations for sputtered wall/divertor carbon, (2) MolDyn molecular dynamics calculations of carbon/hydrocarbon particle reflection at hydrogen-saturated carbon surfaces, (3) ADAS full collisional radiative carbon ion recombination rate coefficients. At low incident particle energies relevant to chemical-erosion (∼0.1-15 eV), we predict high reflection coefficients (∼20-100%), implying more net erosion and T/C codeposition than for full-sticking models. Calculated tritium codeposition rates for the JET MkIIA divertor, using 'reference' chemical erosion yields of order 1% - while higher than previously estimated are well short (X ∼ 1/40) of published data. Possible explanations include much higher chemical erosion yields.

Original languageEnglish (US)
Pages (from-to)424-428
Number of pages5
JournalJournal of Nuclear Materials
Volume313-316
Issue numberSUPPL.
DOIs
StatePublished - Mar 1 2003
EventPlasma - Surface Interactions in Controlled Fusion Devices - Gifu, Japan
Duration: May 26 2002May 31 2002

Fingerprint

Tritium
tritium
erosion
Erosion
Carbon
carbon
ion recombination
Hydrocarbons
particle energy
Molecular dynamics
Hydrogen
hydrocarbons
Impurities
Ions
molecular dynamics
reflectance
impurities
hydrogen
coefficients

Keywords

  • Carbon
  • Codeposition/tritium
  • Erosion/redeposition
  • ITER
  • JET
  • REDEP code

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Materials Science(all)
  • Nuclear Energy and Engineering

Cite this

Advances in the modeling of chemical erosion/redeposition of carbon divertors and application to the JET tritium codeposition problem. / Brooks, J. N.; Kirschner, A.; Whyte, D. G.; Ruzic, D. N.; Alman, D. A.

In: Journal of Nuclear Materials, Vol. 313-316, No. SUPPL., 01.03.2003, p. 424-428.

Research output: Contribution to journalConference article

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AU - Brooks, J. N.

AU - Kirschner, A.

AU - Whyte, D. G.

AU - Ruzic, D. N.

AU - Alman, D. A.

PY - 2003/3/1

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N2 - We have improved the modeling of chemically eroded carbon transport and applied this to JET and ITER. New features are: (1) coupled REDEP and ERO-JET impurity transport code calculations for sputtered wall/divertor carbon, (2) MolDyn molecular dynamics calculations of carbon/hydrocarbon particle reflection at hydrogen-saturated carbon surfaces, (3) ADAS full collisional radiative carbon ion recombination rate coefficients. At low incident particle energies relevant to chemical-erosion (∼0.1-15 eV), we predict high reflection coefficients (∼20-100%), implying more net erosion and T/C codeposition than for full-sticking models. Calculated tritium codeposition rates for the JET MkIIA divertor, using 'reference' chemical erosion yields of order 1% - while higher than previously estimated are well short (X ∼ 1/40) of published data. Possible explanations include much higher chemical erosion yields.

AB - We have improved the modeling of chemically eroded carbon transport and applied this to JET and ITER. New features are: (1) coupled REDEP and ERO-JET impurity transport code calculations for sputtered wall/divertor carbon, (2) MolDyn molecular dynamics calculations of carbon/hydrocarbon particle reflection at hydrogen-saturated carbon surfaces, (3) ADAS full collisional radiative carbon ion recombination rate coefficients. At low incident particle energies relevant to chemical-erosion (∼0.1-15 eV), we predict high reflection coefficients (∼20-100%), implying more net erosion and T/C codeposition than for full-sticking models. Calculated tritium codeposition rates for the JET MkIIA divertor, using 'reference' chemical erosion yields of order 1% - while higher than previously estimated are well short (X ∼ 1/40) of published data. Possible explanations include much higher chemical erosion yields.

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