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Title: The inter-ELM tungsten erosion profile in DIII-D H-mode discharges and benchmarking with ERO+OEDGE modeling [The inter-ELM W erosion profile in DIII-D H-mode discharges and benchmarking with OEDGE+ERO modeling]

Abstract

It is important to develop a predictive capability for the tungsten source rate near the strike points during H-mode operation in ITER and beyond. H-mode deuterium plasma exposures were performed on W-coated graphite and molybdenum substrates in the DIII-D divertor using DiMES. The W-I 400.9 nm spectral line was monitored by fast filtered diagnostics cross calibrated via a high-resolution spectrometer to resolve inter-ELM W erosion. The effective ionization/photon (S/XB) was calibrated using a unique method developed on DIII-D based on surface analysis. Inferred S/XB values agree with an existing empirical scaling at low electron density (n e) but diverge at higher densities, consistent with recent ADAS atomic physics modeling results. Edge modeling of the inter-ELM phase is conducted via OEDGE utilizing the new capability for charge-state resolved carbon impurity fluxes. ERO modeling is performed with the calculated main ion and impurity plasma background from OEDGE. ERO results demonstrate the importance a mixed-material surface model in the interpretation of W sourcing measurements. It is demonstrated that measured inter-ELM W erosion rates can be well explained by C→W sputtering only if a realistic mixed material model is incorporated.

Authors:
 [1];  [2];  [1];  [1];  [3];  [3];  [4];  [5];  [5];  [6];  [6];  [7];  [8]
  1. General Atomics, San Diego, CA (United States)
  2. Oak Ridge Associated Univ., Oak Ridge, TN (United States)
  3. Univ. of California San Diego, San Diego, CA (United States)
  4. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  5. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  6. Univ. of Toronto Institute for Aerospace Studies, Toronto (Canada)
  7. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
  8. Sandia National Lab. (SNL-CA), Livermore, CA (United States)
Publication Date:
Research Org.:
General Atomics, San Diego, CA (United States); Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Fusion Energy Sciences (FES)
OSTI Identifier:
1373580
Alternate Identifier(s):
OSTI ID: 1406371; OSTI ID: 1530093
Report Number(s):
SAND-2017-11522J
Journal ID: ISSN 0029-5515
Grant/Contract Number:  
FC02-04ER54698; AC04-94AL85000; AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Nuclear Fusion
Additional Journal Information:
Journal Volume: 57; Journal Issue: 5; Journal ID: ISSN 0029-5515
Publisher:
IOP Science
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; DIII-D; DiMES; tungsten; erosion; sputtering; ERO modeling

Citation Formats

Abrams, Tyler, Ding, Rui, Guo, Houyang Y., Thomas, Dan M., Chrobak, Christopher P., Rudakov, Dmitry L., McLean, Adam G., Unterberg, Ezekial A., Briesemeister, Alexis R., Stangeby, Peter C., Elder, J. D., Wampler, W. R., and Watkins, Jonathan G. The inter-ELM tungsten erosion profile in DIII-D H-mode discharges and benchmarking with ERO+OEDGE modeling [The inter-ELM W erosion profile in DIII-D H-mode discharges and benchmarking with OEDGE+ERO modeling]. United States: N. p., 2017. Web. https://doi.org/10.1088/1741-4326/aa66b2.
Abrams, Tyler, Ding, Rui, Guo, Houyang Y., Thomas, Dan M., Chrobak, Christopher P., Rudakov, Dmitry L., McLean, Adam G., Unterberg, Ezekial A., Briesemeister, Alexis R., Stangeby, Peter C., Elder, J. D., Wampler, W. R., & Watkins, Jonathan G. The inter-ELM tungsten erosion profile in DIII-D H-mode discharges and benchmarking with ERO+OEDGE modeling [The inter-ELM W erosion profile in DIII-D H-mode discharges and benchmarking with OEDGE+ERO modeling]. United States. https://doi.org/10.1088/1741-4326/aa66b2
Abrams, Tyler, Ding, Rui, Guo, Houyang Y., Thomas, Dan M., Chrobak, Christopher P., Rudakov, Dmitry L., McLean, Adam G., Unterberg, Ezekial A., Briesemeister, Alexis R., Stangeby, Peter C., Elder, J. D., Wampler, W. R., and Watkins, Jonathan G. Mon . "The inter-ELM tungsten erosion profile in DIII-D H-mode discharges and benchmarking with ERO+OEDGE modeling [The inter-ELM W erosion profile in DIII-D H-mode discharges and benchmarking with OEDGE+ERO modeling]". United States. https://doi.org/10.1088/1741-4326/aa66b2. https://www.osti.gov/servlets/purl/1373580.
@article{osti_1373580,
title = {The inter-ELM tungsten erosion profile in DIII-D H-mode discharges and benchmarking with ERO+OEDGE modeling [The inter-ELM W erosion profile in DIII-D H-mode discharges and benchmarking with OEDGE+ERO modeling]},
author = {Abrams, Tyler and Ding, Rui and Guo, Houyang Y. and Thomas, Dan M. and Chrobak, Christopher P. and Rudakov, Dmitry L. and McLean, Adam G. and Unterberg, Ezekial A. and Briesemeister, Alexis R. and Stangeby, Peter C. and Elder, J. D. and Wampler, W. R. and Watkins, Jonathan G.},
abstractNote = {It is important to develop a predictive capability for the tungsten source rate near the strike points during H-mode operation in ITER and beyond. H-mode deuterium plasma exposures were performed on W-coated graphite and molybdenum substrates in the DIII-D divertor using DiMES. The W-I 400.9 nm spectral line was monitored by fast filtered diagnostics cross calibrated via a high-resolution spectrometer to resolve inter-ELM W erosion. The effective ionization/photon (S/XB) was calibrated using a unique method developed on DIII-D based on surface analysis. Inferred S/XB values agree with an existing empirical scaling at low electron density (n e) but diverge at higher densities, consistent with recent ADAS atomic physics modeling results. Edge modeling of the inter-ELM phase is conducted via OEDGE utilizing the new capability for charge-state resolved carbon impurity fluxes. ERO modeling is performed with the calculated main ion and impurity plasma background from OEDGE. ERO results demonstrate the importance a mixed-material surface model in the interpretation of W sourcing measurements. It is demonstrated that measured inter-ELM W erosion rates can be well explained by C→W sputtering only if a realistic mixed material model is incorporated.},
doi = {10.1088/1741-4326/aa66b2},
journal = {Nuclear Fusion},
number = 5,
volume = 57,
place = {United States},
year = {2017},
month = {4}
}

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    Works referencing / citing this record:

    Dynamic divertor control using resonant mixed toroidal harmonic magnetic fields during ELM suppression in DIII-D
    journal, May 2018

    • Jia, M.; Sun, Y.; Paz-Soldan, C.
    • Physics of Plasmas, Vol. 25, Issue 5
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    Effects of carbon impurities on the power radiation and tungsten target erosion in EAST
    journal, July 2018

    • Sang, Chaofeng; Ding, Rui; Bonnin, Xavier
    • Physics of Plasmas, Vol. 25, Issue 7
    • DOI: 10.1063/1.5038848

    Impact of ELM control techniques on tungsten sputtering in the DIII-D divertor and extrapolations to ITER
    journal, June 2019

    • Abrams, T.; Unterberg, E. A.; Rudakov, D. L.
    • Physics of Plasmas, Vol. 26, Issue 6
    • DOI: 10.1063/1.5089895

    Simulations on W impurity transport in the edge of EAST H-mode plasmas
    journal, October 2018

    • Wang, Fuqiong; Zha, X. J.; Duan, Y. M.
    • Plasma Physics and Controlled Fusion, Vol. 60, Issue 12
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    Advances in neutral tungsten ultraviolet spectroscopy for the potential benefit to gross erosion diagnosis
    journal, August 2019

    • Johnson, C. A.; Ennis, D. A.; Loch, S. D.
    • Plasma Physics and Controlled Fusion, Vol. 61, Issue 9
    • DOI: 10.1088/1361-6587/ab2b25

    Effect of carbon and tungsten plasma-facing materials on the divertor and pedestal plasma in EAST
    journal, October 2019

    • Zhang, Chen; Sang, Chaofeng; Wang, Liang
    • Plasma Physics and Controlled Fusion, Vol. 61, Issue 11
    • DOI: 10.1088/1361-6587/ab45de

    Reduced model of high-Z impurity redeposition and erosion in tokamak divertor and its application to DIII-D experiments
    journal, November 2019

    • Guterl, J.; Wampler, W. R.; Rudakov, D.
    • Plasma Physics and Controlled Fusion, Vol. 61, Issue 12
    • DOI: 10.1088/1361-6587/ab5144

    Tungsten erosion by unipolar arcing in DIII-D
    journal, October 2017


    Measurement and modeling of aluminum sputtering and ionization in the DIII-D divertor including magnetic pre-sheath effects
    journal, August 2018


    Erosion, screening, and migration of tungsten in the JET divertor
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    Modeling of inter- and intra-edge-localized mode tungsten erosion during DIII-D H-mode discharges
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    ERO modeling and analysis of tungsten erosion and migration from a toroidally symmetric source in the DIII-D divertor
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