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

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

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 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.

Authors:

Rognlien, Thomas D. ^[1]; McLean, Adam G. ^[1]; Fenstermacher, Max E. ^[1]; Groth, Mathias ^[2]; Jaervinen, Aaro E. ^[1];

^[1]; Lasnier, Charles J. ^[1];

^[1]; Moser, Auna ^[3]; Porter, Gary D. ^[1]; Umansky, Maxim V. ^[1]

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

Publication Date:: Fri Jan 27 00:00:00 EST 2017

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

Sponsoring Org.:: USDOE

OSTI Identifier:: 1372467

Grant/Contract Number:: FC02-04ER54698

Resource Type:: Accepted Manuscript

Journal Name:: Nuclear Materials and Energy

Additional Journal Information:: Journal Volume: 12; Journal ID: ISSN 2352-1791

Publisher:: Elsevier

Country of Publication:: United States

Language:: English

Subject:: 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; divertor modeling; UEDGE; DIII-D

Citation Formats


                    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., and Umansky, Maxim V. Comparison of 2D simulations of detached divertor plasmas with divertor Thomson measurements in the DIII-D tokamak.  United States: N. p., 2017. 
Web.  doi:10.1016/j.nme.2016.12.002.

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                    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. Comparison of 2D simulations of detached divertor plasmas with divertor Thomson measurements in the DIII-D tokamak.  United States.  https://doi.org/10.1016/j.nme.2016.12.002

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                    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., and Umansky, Maxim V. Fri .  
"Comparison of 2D simulations of detached divertor plasmas with divertor Thomson measurements in the DIII-D tokamak".  United States.  https://doi.org/10.1016/j.nme.2016.12.002.  https://www.osti.gov/servlets/purl/1372467.

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@article{osti_1372467,

  title        = {Comparison of 2D simulations of detached divertor plasmas with divertor Thomson measurements in the DIII-D tokamak},

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

  abstractNote = {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 (Bt) 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 (Te) and density (ne) 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 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. Furthermore, these 2D UEDGE transport simulations are enabled for steep-gradient H-mode conditions by newly implemented algorithms to control isolated grid-scale irregularities.},

  doi          = {10.1016/j.nme.2016.12.002},

  journal      = {Nuclear Materials and Energy},

  number       = ,

  volume       = 12,

  place        = {United States},

  year         = {Fri Jan 27 00:00:00 EST 2017},

  month        = {Fri Jan 27 00:00:00 EST 2017}

}

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Works referenced in this record:

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Asakura, Nobuyuki; Shimizu, Katsuhiro; Hoshino, Kazuo
Nuclear Fusion, Vol. 53, Issue 12
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Poloidal distribution of recycling sources and core plasma fueling in DIII-D, ASDEX-Upgrade and JET L-mode plasmas
journal, November 2011

Groth, M.; Porter, G. D.; Rognlien, T. D.
Plasma Physics and Controlled Fusion, Vol. 53, Issue 12
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Influence of the E × B drift in high recycling divertors on target asymmetries
journal, July 2015

Chankin, A. V.; Corrigan, G.; Groth, M.
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Works referencing / citing this record:

First experimental tests of a new small angle slot divertor on DIII-D
journal, July 2019

Guo, H. Y.; Wang, H. Q.; Watkins, J. G.
Nuclear Fusion, Vol. 59, Issue 8
DOI: 10.1088/1741-4326/ab26ee

Neutral density estimation in the ASDEX upgrade divertor from deuterium emissivity measurements during detachment and shoulder formation
journal, September 2019

Agostini, M.; Vianello, N.; Carraro, L.
Plasma Physics and Controlled Fusion, Vol. 61, Issue 11
DOI: 10.1088/1361-6587/ab4122

2D imaging of helium ion velocity in the DIII-D divertor
journal, May 2018

Samuell, C. M.; Porter, G. D.; Meyer, W. H.
Physics of Plasmas, Vol. 25, Issue 5
DOI: 10.1063/1.5017999

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

Abstract

Citation Formats

A simulation study of large power handling in the divertor for a Demo reactor journal, November 2013

Plasma Heat-Flux Dispersal for ACT1 Divertor Configurations journal, January 2015

Analytical calculations for impurity seeded partially detached divertor conditions journal, February 2016

Current Flow Parallel to the Field in a Scrape-Off Layer journal, January 1988

Collisional transport near the separatrix of a tokamak and the H-mode journal, March 1989

Classical drifts in the tokamak SOL and divertor: models and experiment journal, February 1997

Influence of and ∇B drift terms in 2-D edge/SOL transport simulations journal, March 1999

Two-dimensional electric fields and drifts near the magnetic separatrix in divertor tokamaks journal, May 1999

Measurements of flows in the DIII-D divertor by Mach probes journal, March 1999

Stability of the detachment front in a tokamak divertor journal, March 1999

Modelling of the Edge Plasma with Account of Self-Consistent Electric Fields journal, September 2006

Poloidal distribution of recycling sources and core plasma fueling in DIII-D, ASDEX-Upgrade and JET L-mode plasmas journal, November 2011

Influence of the E × B drift in high recycling divertors on target asymmetries journal, July 2015

Thermal heat flux in a plasma for arbitrary collisionality journal, January 1981

Mesoscale Impacts of Explicit Numerical Diffusion in a Convection-Permitting Model journal, January 2012

On central-difference and upwind schemes journal, August 1992

New B2SOLPS5.2 transport code for H-mode regimes in tokamaks journal, January 2009

Simulation of the Alcator C-Mod Divertor with an Improved Neutral Fluid Model journal, January 1996

A design retrospective of the DIII-D tokamak journal, May 2002

2D tomography with bolometry in DIII‐D a) journal, February 1995

Time-dependent 2-D modeling of edge plasma transport with high intermittency due to blobs journal, July 2012

Divertor plasma detachment journal, May 2016

First experimental tests of a new small angle slot divertor on DIII-D journal, July 2019

Neutral density estimation in the ASDEX upgrade divertor from deuterium emissivity measurements during detachment and shoulder formation journal, September 2019

2D imaging of helium ion velocity in the DIII-D divertor journal, May 2018

A simulation study of large power handling in the divertor for a Demo reactor
journal, November 2013

Plasma Heat-Flux Dispersal for ACT1 Divertor Configurations
journal, January 2015

Analytical calculations for impurity seeded partially detached divertor conditions
journal, February 2016

Current Flow Parallel to the Field in a Scrape-Off Layer
journal, January 1988

Collisional transport near the separatrix of a tokamak and the H-mode
journal, March 1989

Classical drifts in the tokamak SOL and divertor: models and experiment
journal, February 1997

Influence of and ∇B drift terms in 2-D edge/SOL transport simulations
journal, March 1999

Two-dimensional electric fields and drifts near the magnetic separatrix in divertor tokamaks
journal, May 1999

Measurements of flows in the DIII-D divertor by Mach probes
journal, March 1999

Stability of the detachment front in a tokamak divertor
journal, March 1999

Modelling of the Edge Plasma with Account of Self-Consistent Electric Fields
journal, September 2006

Poloidal distribution of recycling sources and core plasma fueling in DIII-D, ASDEX-Upgrade and JET L-mode plasmas
journal, November 2011

Influence of the E × B drift in high recycling divertors on target asymmetries
journal, July 2015

Thermal heat flux in a plasma for arbitrary collisionality
journal, January 1981

Mesoscale Impacts of Explicit Numerical Diffusion in a Convection-Permitting Model
journal, January 2012

On central-difference and upwind schemes
journal, August 1992

New B2SOLPS5.2 transport code for H-mode regimes in tokamaks
journal, January 2009

Simulation of the Alcator C-Mod Divertor with an Improved Neutral Fluid Model
journal, January 1996

A design retrospective of the DIII-D tokamak
journal, May 2002

2D tomography with bolometry in DIII‐D ^a)
journal, February 1995

Time-dependent 2-D modeling of edge plasma transport with high intermittency due to blobs
journal, July 2012

Divertor plasma detachment
journal, May 2016

First experimental tests of a new small angle slot divertor on DIII-D
journal, July 2019

Neutral density estimation in the ASDEX upgrade divertor from deuterium emissivity measurements during detachment and shoulder formation
journal, September 2019

2D imaging of helium ion velocity in the DIII-D divertor
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