Comparison of 2D simulations of detached divertor plasmas with divertor Thomson measurements in the DIII-D tokamak
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Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Date
2017
Department
Major/Subject
Mcode
Degree programme
Language
en
Pages
7
Series
Nuclear Materials and Energy
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.Description
Keywords
00-01, 99-00, DIII-D, Divertor modeling, UEDGE
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Citation
Rognlien, T D, McLean, A G, Fenstermacher, M E, Groth, M, Jaervinen, 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, vol. 12, pp. 44-50 . https://doi.org/10.1016/j.nme.2016.12.002
