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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]

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 TZM 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. As a result, 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:
Report Number(s):
SAND-2017-11522J
Journal ID: ISSN 0029-5515
Grant/Contract Number:
FC02-04ER54698; AC04-94AL85000
Type:
Accepted Manuscript
Journal Name:
Nuclear Fusion
Additional Journal Information:
Journal Volume: 57; Journal Issue: 5; Journal ID: ISSN 0029-5515
Publisher:
IOP Science
Research Org:
General Atomics, San Diego, CA (United States); Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org:
USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; DIII-D; DiMES; tungsten; erosion; sputtering; ERO modeling
OSTI Identifier:
1373580
Alternate Identifier(s):
OSTI ID: 1406371

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., Web. doi: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. doi: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.. 2017. "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. doi: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 TZM 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 (ne) 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. As a result, 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}
}