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

Rognlien, Thomas D.; McLean, Adam G.; Fenstermacher, Max E.; Groth, Mathias; Jaervinen, Aaro E.; Joseph, I.; Lasnier, Charles J.; Meyer, William; Moser, Auna; Porter, Gary D.; Umansky, Maxim V.

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

Journal Article · Fri Jan 27 00:00:00 EST 2017 · Nuclear Materials and Energy

DOI:https://doi.org/10.1016/j.nme.2016.12.002· OSTI ID:1372467

Rognlien, Thomas D. ^[1]; McLean, Adam G. ^[2]; Fenstermacher, Max E. ^[2]; Groth, Mathias ^[3]; Jaervinen, Aaro E. ^[2]; ^[2]; Lasnier, Charles J. ^[2]; ^[2]; Moser, Auna ^[4]; Porter, Gary D. ^[2]; Umansky, Maxim V. ^[2]

Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); General Atomics
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Aalto Univ., Espoo (Finland)
General Atomics, San Diego, CA (United States)

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 H-mode regime. The data set, which spans a range of plasmas densities for both forward and reverse toroidal magnetic field (B_t) over a range of plasma densities, 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 calculations show the same features of in/out 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. Furthermore, these 2D UEDGE transport simulations are enabled for steep-gradient H-mode conditions by newly implemented algorithms to control isolated grid-scale irregularities.

View Accepted Manuscript (DOE)

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

Sponsoring Organization:: USDOE

Grant/Contract Number:: FC02-04ER54698

OSTI ID:: 1372467

Alternate ID(s):: OSTI ID: 1426071
OSTI ID: 22834570

Journal Information:: Nuclear Materials and Energy, Journal Name: Nuclear Materials and Energy Vol. 12; ISSN 2352-1791

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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2D imaging of helium ion velocity in the DIII-D divertor Samuell, C. M.; Porter, G. D.; Meyer, W. H. Physics of Plasmas, Vol. 25, Issue 5 https://doi.org/10.1063/1.5017999	journal	May 2018
Neutral density estimation in the ASDEX upgrade divertor from deuterium emissivity measurements during detachment and shoulder formation Agostini, M.; Vianello, N.; Carraro, L. Plasma Physics and Controlled Fusion, Vol. 61, Issue 11 https://doi.org/10.1088/1361-6587/ab4122	journal	September 2019
First experimental tests of a new small angle slot divertor on DIII-D Guo, H. Y.; Wang, H. Q.; Watkins, J. G. Nuclear Fusion, Vol. 59, Issue 8 https://doi.org/10.1088/1741-4326/ab26ee	journal	July 2019

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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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