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Title: Erosion/redeposition analysis : status of modeling and code validation for semi-detached tokamak edge plasmas.

Abstract

We are analyzing erosion and tritium codeposition for ITER, DIII-D, and other devices with a focus on carbon divertor and metallic wall sputtering, for detached and semi-detached edge plasmas. Carbon chemical-sputtering hydrocarbon-transport is computed in detail using upgraded models for sputtering yields, species, and atomic and molecular processes. For the DIII-D analysis this includes proton impact and dissociative recombination for the full methane and higher hydrocarbon chains. Several mixed material (Si-C doping and Be/C) effects on erosion are examined. A semi-detached reactor plasma regime yields peak net wall erosion rates of {approximately}1.0 (Be), {approximately}0.3 (Fe), and {approximately}0.01 (W) cm/burn-yr, and {approximately}50 cm/burn-yr for a carbon divertor. Net carbon erosion is dominated by chemical sputtering in the {approximately}1-3 eV detached plasma zone. Tritium codeposition in divertor-sputtered redeposited carbon is high ({approximately}10-20 g-T/1000 s ). Silicon and beryllium mixing tends to reduce carbon erosion. Initial hydrocarbon transport calculations for the DIII-D DiMES-73 detached plasma experiment show a broad spectrum of redeposited molecules with {approximately}90% redeposition fraction.

Authors:
Publication Date:
Research Org.:
Argonne National Lab., IL (US)
Sponsoring Org.:
US Department of Energy (US)
OSTI Identifier:
10811
Report Number(s):
ANL/TD/CP-96490
TRN: US0103859
DOE Contract Number:  
W-31109-ENG-38
Resource Type:
Conference
Resource Relation:
Conference: 13th PSI Conference, San Diego, CA (US), 05/18/1998--05/22/1998; Other Information: PBD: 19 Jan 1999
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; BERYLLIUM; CARBON; DIVERTORS; DOUBLET-3 DEVICE; HYDROCARBONS; METHANE; PROTONS; RECOMBINATION; SILICON; SPUTTERING; TRITIUM; VALIDATION; EROSION; DEPOSITION; ITER TOKAMAK; FIRST WALL

Citation Formats

Brooks, J N. Erosion/redeposition analysis : status of modeling and code validation for semi-detached tokamak edge plasmas.. United States: N. p., 1999. Web.
Brooks, J N. Erosion/redeposition analysis : status of modeling and code validation for semi-detached tokamak edge plasmas.. United States.
Brooks, J N. 1999. "Erosion/redeposition analysis : status of modeling and code validation for semi-detached tokamak edge plasmas.". United States. https://www.osti.gov/servlets/purl/10811.
@article{osti_10811,
title = {Erosion/redeposition analysis : status of modeling and code validation for semi-detached tokamak edge plasmas.},
author = {Brooks, J N},
abstractNote = {We are analyzing erosion and tritium codeposition for ITER, DIII-D, and other devices with a focus on carbon divertor and metallic wall sputtering, for detached and semi-detached edge plasmas. Carbon chemical-sputtering hydrocarbon-transport is computed in detail using upgraded models for sputtering yields, species, and atomic and molecular processes. For the DIII-D analysis this includes proton impact and dissociative recombination for the full methane and higher hydrocarbon chains. Several mixed material (Si-C doping and Be/C) effects on erosion are examined. A semi-detached reactor plasma regime yields peak net wall erosion rates of {approximately}1.0 (Be), {approximately}0.3 (Fe), and {approximately}0.01 (W) cm/burn-yr, and {approximately}50 cm/burn-yr for a carbon divertor. Net carbon erosion is dominated by chemical sputtering in the {approximately}1-3 eV detached plasma zone. Tritium codeposition in divertor-sputtered redeposited carbon is high ({approximately}10-20 g-T/1000 s ). Silicon and beryllium mixing tends to reduce carbon erosion. Initial hydrocarbon transport calculations for the DIII-D DiMES-73 detached plasma experiment show a broad spectrum of redeposited molecules with {approximately}90% redeposition fraction.},
doi = {},
url = {https://www.osti.gov/biblio/10811}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Jan 19 00:00:00 EST 1999},
month = {Tue Jan 19 00:00:00 EST 1999}
}

Conference:
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