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

doi:10.1016/S0022-3115(02)01405-8

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 journal › Conference article › peer-review

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 language	English (US)
Pages (from-to)	424-428
Number of pages	5
Journal	Journal of Nuclear Materials
Volume	313-316
Issue number	SUPPL.
DOIs	https://doi.org/10.1016/S0022-3115(02)01405-8
State	Published - Mar 2003
Event	Plasma - Surface Interactions in Controlled Fusion Devices - Gifu, Japan Duration: May 26 2002 → May 31 2002

Keywords

Carbon
Codeposition/tritium
Erosion/redeposition
ITER
JET
REDEP code

ASJC Scopus subject areas

Nuclear and High Energy Physics
General Materials Science
Nuclear Energy and Engineering

Online availability

10.1016/S0022-3115(02)01405-8

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

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.",

keywords = "Carbon, Codeposition/tritium, Erosion/redeposition, ITER, JET, REDEP code",

author = "Brooks, {J. N.} and A. Kirschner and Whyte, {D. G.} and Ruzic, {D. N.} and Alman, {D. A.}",

note = "Funding Information: US work supported by the US Department of Energy, Office of Fusion Energy.; Plasma - Surface Interactions in Controlled Fusion Devices ; Conference date: 26-05-2002 Through 31-05-2002",

year = "2003",

month = mar,

doi = "10.1016/S0022-3115(02)01405-8",

language = "English (US)",

volume = "313-316",

pages = "424--428",

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issn = "0022-3115",

publisher = "Elsevier",

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TY - JOUR

T1 - Advances in the modeling of chemical erosion/redeposition of carbon divertors and application to the JET tritium codeposition problem

AU - Brooks, J. N.

AU - Kirschner, A.

AU - Whyte, D. G.

AU - Ruzic, D. N.

AU - Alman, D. A.

N1 - Funding Information: US work supported by the US Department of Energy, Office of Fusion Energy.

PY - 2003/3

Y1 - 2003/3

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.

KW - Carbon

KW - Codeposition/tritium

KW - Erosion/redeposition

KW - ITER

KW - JET

KW - REDEP code

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SN - 0022-3115

VL - 313-316

SP - 424

EP - 428

JO - Journal of Nuclear Materials

JF - Journal of Nuclear Materials

IS - SUPPL.

T2 - Plasma - Surface Interactions in Controlled Fusion Devices

Y2 - 26 May 2002 through 31 May 2002

ER -

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

Abstract

Keywords

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