Comparison of 2D simulations of detached divertor plasmas with divertor Thomson measurements in the DIII-D tokamak

T. D. Rognlien; A. G. McLean; M. E. Fenstermacher; M. Groth; A. E. Järvinen; I. Joseph; C. J. Lasnier; W. Meyer; A. Moser; G. D. Porter; M. V. Umansky

doi:10.1016/j.nme.2016.12.002

Comparison of 2D simulations of detached divertor plasmas with divertor Thomson measurements in the DIII-D tokamak

T. D. Rognlien, A. G. McLean, M. E. Fenstermacher, M. Groth, A. E. Järvinen, I. Joseph, C. J. Lasnier, W. Meyer, A. Moser, G. D. Porter, M. V. Umansky

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Abstract

A modeling study is reported using new 2D data from DIII-D tokamak divertor plasmas and improved 2D transport model that includes large cross-field drifts for the numerically difficult low anomalous transport regime associated with the H-mode. The data set, which spans a range of plasma densities for both forward and reverse toroidal magnetic field (B_t), is provided by divertor Thomson scattering (DTS). Measurements utilizing X-point sweeping give corresponding 2D profiles of electron temperature (T_e) and density (n_e) across both divertor legs for individual discharges. The simulations focus on the open magnetic field-line regions, though they also include a small region of closed field lines. The calculations show the same features of in/out divertor plasma asymmetries as measured in the experiment, with the normal B_t direction (ion ∇B drift toward the X-point) having higher n_e and lower T_e in the inner divertor leg than outer. Corresponding emission data for total radiated power shows a strong inner-divertor/outer-divertor asymmetry that is reproduced by the simulations. These 2D UEDGE transport simulations are enabled for steep-gradient H-mode conditions by newly implemented algorithms to control isolated grid-scale irregularities.

Original language	English
Pages (from-to)	44-50
Number of pages	7
Journal	Nuclear Materials and Energy
Volume	12
DOIs	https://doi.org/10.1016/j.nme.2016.12.002
Publication status	Published - Aug 2017
MoE publication type	A1 Journal article-refereed

Keywords

DIII-D
Divertor modeling
UEDGE

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10.1016/j.nme.2016.12.002

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Rognlien, T. D., McLean, A. G., Fenstermacher, M. E., Groth, M., Järvinen, A. E., Joseph, I., Lasnier, C. J., Meyer, W., Moser, A., Porter, G. D., & Umansky, M. V. (2017). Comparison of 2D simulations of detached divertor plasmas with divertor Thomson measurements in the DIII-D tokamak. Nuclear Materials and Energy, 12, 44-50. https://doi.org/10.1016/j.nme.2016.12.002

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abstract = "A modeling study is reported using new 2D data from DIII-D tokamak divertor plasmas and improved 2D transport model that includes large cross-field drifts for the numerically difficult low anomalous transport regime associated with the H-mode. The data set, which spans a range of plasma densities for both forward and reverse toroidal magnetic field (Bt), is provided by divertor Thomson scattering (DTS). Measurements utilizing X-point sweeping give corresponding 2D profiles of electron temperature (Te) and density (ne) across both divertor legs for individual discharges. The simulations focus on the open magnetic field-line regions, though they also include a small region of closed field lines. The calculations show the same features of in/out divertor plasma asymmetries as measured in the experiment, with the normal Bt direction (ion ∇B drift toward the X-point) having higher ne and lower Te in the inner divertor leg than outer. Corresponding emission data for total radiated power shows a strong inner-divertor/outer-divertor asymmetry that is reproduced by the simulations. These 2D UEDGE transport simulations are enabled for steep-gradient H-mode conditions by newly implemented algorithms to control isolated grid-scale irregularities.",

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doi = "10.1016/j.nme.2016.12.002",

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AU - Rognlien, T. D.

AU - McLean, A. G.

AU - Fenstermacher, M. E.

AU - Groth, M.

AU - Järvinen, A. E.

AU - Joseph, I.

AU - Lasnier, C. J.

AU - Meyer, W.

AU - Moser, A.

AU - Porter, G. D.

AU - Umansky, M. V.

PY - 2017/8

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N2 - A modeling study is reported using new 2D data from DIII-D tokamak divertor plasmas and improved 2D transport model that includes large cross-field drifts for the numerically difficult low anomalous transport regime associated with the H-mode. The data set, which spans a range of plasma densities for both forward and reverse toroidal magnetic field (Bt), is provided by divertor Thomson scattering (DTS). Measurements utilizing X-point sweeping give corresponding 2D profiles of electron temperature (Te) and density (ne) across both divertor legs for individual discharges. The simulations focus on the open magnetic field-line regions, though they also include a small region of closed field lines. The calculations show the same features of in/out divertor plasma asymmetries as measured in the experiment, with the normal Bt direction (ion ∇B drift toward the X-point) having higher ne and lower Te in the inner divertor leg than outer. Corresponding emission data for total radiated power shows a strong inner-divertor/outer-divertor asymmetry that is reproduced by the simulations. These 2D UEDGE transport simulations are enabled for steep-gradient H-mode conditions by newly implemented algorithms to control isolated grid-scale irregularities.

AB - A modeling study is reported using new 2D data from DIII-D tokamak divertor plasmas and improved 2D transport model that includes large cross-field drifts for the numerically difficult low anomalous transport regime associated with the H-mode. The data set, which spans a range of plasma densities for both forward and reverse toroidal magnetic field (Bt), is provided by divertor Thomson scattering (DTS). Measurements utilizing X-point sweeping give corresponding 2D profiles of electron temperature (Te) and density (ne) across both divertor legs for individual discharges. The simulations focus on the open magnetic field-line regions, though they also include a small region of closed field lines. The calculations show the same features of in/out divertor plasma asymmetries as measured in the experiment, with the normal Bt direction (ion ∇B drift toward the X-point) having higher ne and lower Te in the inner divertor leg than outer. Corresponding emission data for total radiated power shows a strong inner-divertor/outer-divertor asymmetry that is reproduced by the simulations. These 2D UEDGE transport simulations are enabled for steep-gradient H-mode conditions by newly implemented algorithms to control isolated grid-scale irregularities.

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KW - UEDGE

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Comparison of 2D simulations of detached divertor plasmas with divertor Thomson measurements in the DIII-D tokamak

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Keywords

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