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]

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.

doi:10.1088/1741-4326/aa66b2

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]

Journal Article · Mon Apr 03 00:00:00 EDT 2017 · Nuclear Fusion

DOI:https://doi.org/10.1088/1741-4326/aa66b2· OSTI ID:1373580

Abrams, Tyler ^[1]; Ding, Rui ^[2]; Guo, Houyang Y. ^[3]; Thomas, Dan M. ^[3]; Chrobak, Christopher P. ^[4]; Rudakov, Dmitry L. ^[4]; McLean, Adam G. ^[5]; Unterberg, Ezekial A. ^[6]; Briesemeister, Alexis R. ^[6]; Stangeby, Peter C. ^[7]; Elder, J. D. ^[7]; Wampler, W. R. ^[8]; Watkins, Jonathan G. ^[9]

General Atomics, San Diego, CA (United States); General Atomics
Oak Ridge Associated Univ., Oak Ridge, TN (United States)
General Atomics, San Diego, CA (United States)
Univ. of California San Diego, San Diego, CA (United States)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Univ. of Toronto Institute for Aerospace Studies, Toronto (Canada)
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sandia National Lab. (SNL-CA), Livermore, CA (United States)

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.

View Accepted Manuscript (DOE)

Research Organization:: General Atomics, San Diego, CA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: FC02-04ER54698

OSTI ID:: 1373580

Alternate ID(s):: OSTI ID: 1406371
OSTI ID: 1530093
OSTI ID: 1890819
OSTI ID: 22925711

Journal Information:: Nuclear Fusion, Journal Name: Nuclear Fusion Journal Issue: 5 Vol. 57; ISSN 0029-5515

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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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]

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