Interpretations of the impact of cross-field drifts on divertor flows in DIII-D with UEDGE

A. E. Järvinen; S. L. Allen; M. Groth; A. G. McLean; T. D. Rognlien; C. M. Samuell; A. Briesemeister; M. Fenstermacher; D. N. Hill; A. W. Leonard; G. D. Porter

doi:10.1016/j.nme.2016.11.014

Interpretations of the impact of cross-field drifts on divertor flows in DIII-D with UEDGE

A. E. Järvinen^*
, S. L. Allen
, M. Groth
, A. G. McLean
, T. D. Rognlien
, C. M. Samuell
, A. Briesemeister
, M. Fenstermacher
, D. N. Hill
, A. W. Leonard
, G. D. Porter

^*Corresponding author for this work

Not published at VTT

Research output: Contribution to journal › Article › Scientific › peer-review

25 Citations (Scopus)

Abstract

Simulations using the multi-fluid code UEDGE indicates that, in low confinement (L-mode) plasmas in DIII-D, poloidal projection of the ionization driven flows dominate poloidal particle flows in the divertor near the divertor plates, whereas E × B drift flows dominate the radial particle flows. In contrast, in high confinement (H-mode) conditions E × B drift flows dominate both poloidal and radial particle flows in the divertor in the vicinity of the strong gradient region near the separatrix. UEDGE indicates that the toroidal C²⁺ flow velocities in the divertor plasmas are mainly entrained within 30% to the background deuterium flow in both L- and H-mode plasmas in the plasma region where the CIII 465 nm emission is measured. Therefore, UEDGE indicates that the Doppler Coherence Imaging Spectroscopy (CIS), measuring the toroidal velocity of the C²⁺ ions, can provide insight to the deuterium flows in the divertor. Parallel-to-B velocity dominates the toroidal divertor flow; direct drift impact being less than 1%. Toroidal divertor flow is predicted to reverse when the magnetic field is reversed. This is explained by the parallel-B flow towards the nearest divertor plate corresponding to opposite toroidal directions in opposite toroidal field configurations.

Original language	English
Pages (from-to)	1136-1140
Number of pages	5
Journal	Nuclear Materials and Energy
Volume	12
DOIs	https://doi.org/10.1016/j.nme.2016.11.014
Publication status	Published - Aug 2017
MoE publication type	A1 Journal article-refereed

Funding

This work was supported in part under the auspices of the US Department of Energy (DOE) by LLNL under DE-AC52-07NA27344 and by the US DOE under DE-FC02-04ER54698 , DE-FG02-07ER54917 , DE-AC05-00OR22725 , and DE-AC04-94AL85000 . DIII-D data shown in this paper can be obtained in digital format by following the links at https://fusion.gat.com/global/D3D_DMP .

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

SDG 7 Affordable and Clean Energy

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10.1016/j.nme.2016.11.014

Cite this

@article{4429a5096e90491e9181720ae7c642f5,

title = "Interpretations of the impact of cross-field drifts on divertor flows in DIII-D with UEDGE",

abstract = "Simulations using the multi-fluid code UEDGE indicates that, in low confinement (L-mode) plasmas in DIII-D, poloidal projection of the ionization driven flows dominate poloidal particle flows in the divertor near the divertor plates, whereas E × B drift flows dominate the radial particle flows. In contrast, in high confinement (H-mode) conditions E × B drift flows dominate both poloidal and radial particle flows in the divertor in the vicinity of the strong gradient region near the separatrix. UEDGE indicates that the toroidal C2+ flow velocities in the divertor plasmas are mainly entrained within 30\% to the background deuterium flow in both L- and H-mode plasmas in the plasma region where the CIII 465 nm emission is measured. Therefore, UEDGE indicates that the Doppler Coherence Imaging Spectroscopy (CIS), measuring the toroidal velocity of the C2+ ions, can provide insight to the deuterium flows in the divertor. Parallel-to-B velocity dominates the toroidal divertor flow; direct drift impact being less than 1\%. Toroidal divertor flow is predicted to reverse when the magnetic field is reversed. This is explained by the parallel-B flow towards the nearest divertor plate corresponding to opposite toroidal directions in opposite toroidal field configurations.",

author = "J{\"a}rvinen, \{A. E.\} and Allen, \{S. L.\} and M. Groth and McLean, \{A. G.\} and Rognlien, \{T. D.\} and Samuell, \{C. M.\} and A. Briesemeister and M. Fenstermacher and Hill, \{D. N.\} and Leonard, \{A. W.\} and Porter, \{G. D.\}",

note = "Funding Information: This work was supported in part under the auspices of the US Department of Energy (DOE) by LLNL under DE-AC52-07NA27344 and by the US DOE under DE-FC02-04ER54698 , DE-FG02-07ER54917 , DE-AC05-00OR22725 , and DE-AC04-94AL85000 . DIII-D data shown in this paper can be obtained in digital format by following the links at https://fusion.gat.com/global/D3D\_DMP . Publisher Copyright: {\textcopyright} 2017 Elsevier Ltd",

year = "2017",

month = aug,

doi = "10.1016/j.nme.2016.11.014",

language = "English",

volume = "12",

pages = "1136--1140",

journal = "Nuclear Materials and Energy",

issn = "2352-1791",

publisher = "Elsevier",

}

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T1 - Interpretations of the impact of cross-field drifts on divertor flows in DIII-D with UEDGE

AU - Järvinen, A. E.

AU - Allen, S. L.

AU - Groth, M.

AU - McLean, A. G.

AU - Rognlien, T. D.

AU - Samuell, C. M.

AU - Briesemeister, A.

AU - Fenstermacher, M.

AU - Hill, D. N.

AU - Leonard, A. W.

AU - Porter, G. D.

N1 - Funding Information: This work was supported in part under the auspices of the US Department of Energy (DOE) by LLNL under DE-AC52-07NA27344 and by the US DOE under DE-FC02-04ER54698 , DE-FG02-07ER54917 , DE-AC05-00OR22725 , and DE-AC04-94AL85000 . DIII-D data shown in this paper can be obtained in digital format by following the links at https://fusion.gat.com/global/D3D_DMP . Publisher Copyright: © 2017 Elsevier Ltd

PY - 2017/8

Y1 - 2017/8

N2 - Simulations using the multi-fluid code UEDGE indicates that, in low confinement (L-mode) plasmas in DIII-D, poloidal projection of the ionization driven flows dominate poloidal particle flows in the divertor near the divertor plates, whereas E × B drift flows dominate the radial particle flows. In contrast, in high confinement (H-mode) conditions E × B drift flows dominate both poloidal and radial particle flows in the divertor in the vicinity of the strong gradient region near the separatrix. UEDGE indicates that the toroidal C2+ flow velocities in the divertor plasmas are mainly entrained within 30% to the background deuterium flow in both L- and H-mode plasmas in the plasma region where the CIII 465 nm emission is measured. Therefore, UEDGE indicates that the Doppler Coherence Imaging Spectroscopy (CIS), measuring the toroidal velocity of the C2+ ions, can provide insight to the deuterium flows in the divertor. Parallel-to-B velocity dominates the toroidal divertor flow; direct drift impact being less than 1%. Toroidal divertor flow is predicted to reverse when the magnetic field is reversed. This is explained by the parallel-B flow towards the nearest divertor plate corresponding to opposite toroidal directions in opposite toroidal field configurations.

AB - Simulations using the multi-fluid code UEDGE indicates that, in low confinement (L-mode) plasmas in DIII-D, poloidal projection of the ionization driven flows dominate poloidal particle flows in the divertor near the divertor plates, whereas E × B drift flows dominate the radial particle flows. In contrast, in high confinement (H-mode) conditions E × B drift flows dominate both poloidal and radial particle flows in the divertor in the vicinity of the strong gradient region near the separatrix. UEDGE indicates that the toroidal C2+ flow velocities in the divertor plasmas are mainly entrained within 30% to the background deuterium flow in both L- and H-mode plasmas in the plasma region where the CIII 465 nm emission is measured. Therefore, UEDGE indicates that the Doppler Coherence Imaging Spectroscopy (CIS), measuring the toroidal velocity of the C2+ ions, can provide insight to the deuterium flows in the divertor. Parallel-to-B velocity dominates the toroidal divertor flow; direct drift impact being less than 1%. Toroidal divertor flow is predicted to reverse when the magnetic field is reversed. This is explained by the parallel-B flow towards the nearest divertor plate corresponding to opposite toroidal directions in opposite toroidal field configurations.

UR - https://www.scopus.com/pages/publications/85010908244

U2 - 10.1016/j.nme.2016.11.014

DO - 10.1016/j.nme.2016.11.014

M3 - Article

AN - SCOPUS:85010908244

SN - 2352-1791

VL - 12

SP - 1136

EP - 1140

JO - Nuclear Materials and Energy

JF - Nuclear Materials and Energy

ER -

Interpretations of the impact of cross-field drifts on divertor flows in DIII-D with UEDGE

Abstract

Funding

UN SDGs

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