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Title: Modeling of inter- and intra-edge-localized mode tungsten erosion during DIII-D H-mode discharges

Abstract

The relationship between the tungsten gross erosion and the ELM characteristics is investigated for high performance (H-mode) discharges during the dedicated Metal Rings Campaign in DIII-D, using the one-dimensional ‘free-streaming’ ELM model, coupled to a simple analytical TRIM.SP sputtering model, while the OEDGE code is employed to calculate the inter-ELM impurity distribution and tungsten gross erosion. A carbon-tungsten mixed target material is used for both inter- and intra-ELM simulations. The OEDGE results reveal that the inter-ELM tungsten gross erosion rate is not sensitive to the carbon fraction on the tungsten surface layer; a wider range of carbon fractions from 0.3 to 0.6 give similar tungsten gross erosion profiles and match the diagnostic data, which is consistent with the simple analytical model. However, the intra-ELM simulation indicates that the value of surface carbon fraction can be as low as 0.3 to reproduce the measured tungsten gross erosion during ELMs, based on the effective ionizations/photon (S/XB) value of WI emissions. Finally, for both inter- and intra-ELM cases, carbon is predicted to dominate the tungsten erosion. However, in contrast to the inter-ELM tungsten erosion, which is dominated by locally redeposited C 2+, the energetic C 6+ originating from the pedestal can contribute substantialmore » tungsten erosion in the near-separatrix region during ELMs, and the width of this C 6+ dominated region exhibits a negative correlation with the heat flux density carried by ELMs.« less

Authors:
ORCiD logo [1]; ORCiD logo [2];  [3];  [3];  [4];  [5];  [3]; ORCiD logo [6];  [3];  [7]
  1. Univ. of Science and Technology of China, Hefei (China). School of Physical Science; Shenzhen Univ. (China). College of Physics and Optoelectronic Engineering
  2. Oak Ridge Associated Univ., Oak Ridge, TN (United States)
  3. General Atomics, San Diego, CA (United States)
  4. Univ. of Toronto (Canada). Inst. for Aerospace Studies
  5. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  6. General Atomics, San Diego, CA (United States); Univ. of Toronto (Canada). Inst. for Aerospace Studies
  7. Univ. of Science and Technology of China, Hefei (China). School of Physical Science
Publication Date:
Research Org.:
General Atomics, San Diego, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24)
OSTI Identifier:
1577445
Grant/Contract Number:  
FC02-04ER54698; SC0018423
Resource Type:
Accepted Manuscript
Journal Name:
Nuclear Fusion
Additional Journal Information:
Journal Volume: 59; Journal Issue: 12; Journal ID: ISSN 0029-5515
Publisher:
IOP Science
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; plasma material interaction; tungsten erosion; ELM; fusion

Citation Formats

Xu, G. L., Guterl, J., Abrams, T., Wang, H. Q., Elder, J. D., Unterberg, E. A., Thomas, D. M., Stangeby, P. C., Guo, H. Y., and Ye, M. Y. Modeling of inter- and intra-edge-localized mode tungsten erosion during DIII-D H-mode discharges. United States: N. p., 2019. Web. doi:10.1088/1741-4326/ab3e96.
Xu, G. L., Guterl, J., Abrams, T., Wang, H. Q., Elder, J. D., Unterberg, E. A., Thomas, D. M., Stangeby, P. C., Guo, H. Y., & Ye, M. Y. Modeling of inter- and intra-edge-localized mode tungsten erosion during DIII-D H-mode discharges. United States. doi:10.1088/1741-4326/ab3e96.
Xu, G. L., Guterl, J., Abrams, T., Wang, H. Q., Elder, J. D., Unterberg, E. A., Thomas, D. M., Stangeby, P. C., Guo, H. Y., and Ye, M. Y. Fri . "Modeling of inter- and intra-edge-localized mode tungsten erosion during DIII-D H-mode discharges". United States. doi:10.1088/1741-4326/ab3e96.
@article{osti_1577445,
title = {Modeling of inter- and intra-edge-localized mode tungsten erosion during DIII-D H-mode discharges},
author = {Xu, G. L. and Guterl, J. and Abrams, T. and Wang, H. Q. and Elder, J. D. and Unterberg, E. A. and Thomas, D. M. and Stangeby, P. C. and Guo, H. Y. and Ye, M. Y.},
abstractNote = {The relationship between the tungsten gross erosion and the ELM characteristics is investigated for high performance (H-mode) discharges during the dedicated Metal Rings Campaign in DIII-D, using the one-dimensional ‘free-streaming’ ELM model, coupled to a simple analytical TRIM.SP sputtering model, while the OEDGE code is employed to calculate the inter-ELM impurity distribution and tungsten gross erosion. A carbon-tungsten mixed target material is used for both inter- and intra-ELM simulations. The OEDGE results reveal that the inter-ELM tungsten gross erosion rate is not sensitive to the carbon fraction on the tungsten surface layer; a wider range of carbon fractions from 0.3 to 0.6 give similar tungsten gross erosion profiles and match the diagnostic data, which is consistent with the simple analytical model. However, the intra-ELM simulation indicates that the value of surface carbon fraction can be as low as 0.3 to reproduce the measured tungsten gross erosion during ELMs, based on the effective ionizations/photon (S/XB) value of WI emissions. Finally, for both inter- and intra-ELM cases, carbon is predicted to dominate the tungsten erosion. However, in contrast to the inter-ELM tungsten erosion, which is dominated by locally redeposited C2+, the energetic C6+ originating from the pedestal can contribute substantial tungsten erosion in the near-separatrix region during ELMs, and the width of this C6+ dominated region exhibits a negative correlation with the heat flux density carried by ELMs.},
doi = {10.1088/1741-4326/ab3e96},
journal = {Nuclear Fusion},
number = 12,
volume = 59,
place = {United States},
year = {2019},
month = {10}
}

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