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Title: OEDGE modeling for the planned tungsten ring experiment on DIII-D

Abstract

The OEDGE code is used to model tungsten erosion and transport for DIII-D experiments with toroidal rings of high-Z metal tiles. Such modeling is needed for both experimental and diagnostic design to have estimates of the expected core and edge tungsten density and to understand the various factors contributing to the uncertainties in these calculations. OEDGE simulations are performed using the planned experimental magnetic geometries and plasma conditions typical of both L-mode and inter-ELM H-mode discharges in DIII-D. OEDGE plasma reconstruction based on specific representative discharges for similar geometries is used to determine the plasma conditions applied to tungsten plasma impurity simulations. We developed a new model for tungsten erosion in OEDGE which imports charge-state resolved carbon impurity fluxes and impact energies from a separate OEDGE run which models the carbon production, transport and deposition for the same plasma conditions as the tungsten simulations. Furthermore, these values are then used to calculate the gross tungsten physical sputtering due to carbon plasma impurities which is then added to any sputtering by deuterium ions; tungsten self-sputtering is also included. The code results are found to be dependent on the following factors: divertor geometry and closure, the choice of cross-field anomalous transport coefficients,more » divertor plasma conditions (affecting both tungsten source strength and transport), the choice of tungsten atomic physics data used in the model (in particular sviz(Te) for W-atoms), and the model of the carbon flux and energy used for 2 calculating the tungsten source due to sputtering. The core tungsten density is found to be of order 1015 m-3 (excluding effects of any core transport barrier and with significant variability depending on the other factors mentioned) with density decaying into the scrape off layer.« less

Authors:
; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
General Atomics, San Diego, CA (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Nuclear Energy (NE); USDOE Office of Science (SC), Fusion Energy Sciences (FES); USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1471775
Alternate Identifier(s):
OSTI ID: 1374999; OSTI ID: 1474376; OSTI ID: 1530090
Report Number(s):
LLNL-JRNL-752152
Journal ID: ISSN 2352-1791; S2352179116301983; PII: S2352179116301983
Grant/Contract Number:  
AC05-06OR23100; FC02-04ER54698; AC52007NA27344; FG02-07ER54917; AC05-00OR22725; AC04-94AL85000; AC52-07NA27344; AC52-007NA27344
Resource Type:
Published Article
Journal Name:
Nuclear Materials and Energy
Additional Journal Information:
Journal Name: Nuclear Materials and Energy Journal Volume: 12 Journal Issue: C; Journal ID: ISSN 2352-1791
Publisher:
Elsevier
Country of Publication:
Netherlands
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; Physics - Plasma physics

Citation Formats

Elder, J. D., Stangeby, P. C., Abrams, T., Ding, R., Leonard, A. W., McLean, A. G., Rudakov, D. L., Unterberg, E. A., and Watkins, J. G. OEDGE modeling for the planned tungsten ring experiment on DIII-D. Netherlands: N. p., 2017. Web. doi:10.1016/j.nme.2017.03.039.
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Elder, J. D., Stangeby, P. C., Abrams, T., Ding, R., Leonard, A. W., McLean, A. G., Rudakov, D. L., Unterberg, E. A., & Watkins, J. G. OEDGE modeling for the planned tungsten ring experiment on DIII-D. Netherlands. https://doi.org/10.1016/j.nme.2017.03.039
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Elder, J. D., Stangeby, P. C., Abrams, T., Ding, R., Leonard, A. W., McLean, A. G., Rudakov, D. L., Unterberg, E. A., and Watkins, J. G. Wed . "OEDGE modeling for the planned tungsten ring experiment on DIII-D". Netherlands. https://doi.org/10.1016/j.nme.2017.03.039.
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@article{osti_1471775,
title = {OEDGE modeling for the planned tungsten ring experiment on DIII-D},
author = {Elder, J. D. and Stangeby, P. C. and Abrams, T. and Ding, R. and Leonard, A. W. and McLean, A. G. and Rudakov, D. L. and Unterberg, E. A. and Watkins, J. G.},
abstractNote = {The OEDGE code is used to model tungsten erosion and transport for DIII-D experiments with toroidal rings of high-Z metal tiles. Such modeling is needed for both experimental and diagnostic design to have estimates of the expected core and edge tungsten density and to understand the various factors contributing to the uncertainties in these calculations. OEDGE simulations are performed using the planned experimental magnetic geometries and plasma conditions typical of both L-mode and inter-ELM H-mode discharges in DIII-D. OEDGE plasma reconstruction based on specific representative discharges for similar geometries is used to determine the plasma conditions applied to tungsten plasma impurity simulations. We developed a new model for tungsten erosion in OEDGE which imports charge-state resolved carbon impurity fluxes and impact energies from a separate OEDGE run which models the carbon production, transport and deposition for the same plasma conditions as the tungsten simulations. Furthermore, these values are then used to calculate the gross tungsten physical sputtering due to carbon plasma impurities which is then added to any sputtering by deuterium ions; tungsten self-sputtering is also included. The code results are found to be dependent on the following factors: divertor geometry and closure, the choice of cross-field anomalous transport coefficients, divertor plasma conditions (affecting both tungsten source strength and transport), the choice of tungsten atomic physics data used in the model (in particular sviz(Te) for W-atoms), and the model of the carbon flux and energy used for 2 calculating the tungsten source due to sputtering. The core tungsten density is found to be of order 1015 m-3 (excluding effects of any core transport barrier and with significant variability depending on the other factors mentioned) with density decaying into the scrape off layer.},
doi = {10.1016/j.nme.2017.03.039},
journal = {Nuclear Materials and Energy},
number = C,
volume = 12,
place = {Netherlands},
year = {Wed Apr 19 00:00:00 EDT 2017},
month = {Wed Apr 19 00:00:00 EDT 2017}
}
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Journal Article:
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Publisher's Version of Record
https://doi.org/10.1016/j.nme.2017.03.039
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Figures / Tables:

Figure 2 Figure 2: Target Jsat and Te for the three different plasma conditions used.
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Works referenced in this record:

The inter-ELM tungsten erosion profile in DIII-D H-mode discharges and benchmarking with ERO+OEDGE modeling
journal, April 2017

Principal processes occurring at simultaneous bombardment of tungsten by carbon and deuterium ions
journal, October 2007

  • Bizyukov, Ivan; Krieger, Karl
  • Journal of Applied Physics, Vol. 102, Issue 7
  • DOI: 10.1063/1.2786113

Tungsten divertor erosion in all metal devices: Lessons from the ITER like wall of JET
journal, July 2013

A full tungsten divertor for ITER: Physics issues and design status
journal, July 2013

Advances in understanding of high- Z material erosion and re-deposition in low- Z wall environment in DIII-D
journal, March 2017

An integrated model of impurity migration and wall composition dynamics for tokamaks
journal, August 2011

Analysis of performance of the optimized divertor in ITER
journal, May 2009

Spectroscopic measurements of tungsten erosion in the ASDEX Upgrade divertor
journal, September 1997

Spectroscopic investigations of tungsten in the EUV region and the determination of its concentration in tokamaks
journal, July 1998

The EIRENE and B2-EIRENE Codes
journal, February 2005

  • Reiter, D.; Baelmans, M.; Börner, P.
  • Fusion Science and Technology, Vol. 47, Issue 2
  • DOI: 10.13182/FST47-172
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    Figures / Tables found in this record:

    Figure 2 (p. 3)figure
    Figure 3 (p. 3)figure
    Figure-1 (p. 3)figure
    Figure 4 (p. 4)figure
    Figure 5 (p. 4)figure
    Table 1 (p. 4)table
    Figure 6 (p. 5)figure
    Figure 7 (p. 5)figure
    Figure 8 (p. 5)figure
    Figure 9 (p. 5)figure
    Figure 10 (p. 6)figure
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