Design and physics basis for the upcoming DIII-D SAS-VW campaign to quantify tungsten leakage and transport in a new slot divertor geometry

Abrams, Tyler; Sinclair, Greg; Nichols, Jake H.; Unterberg, Ezekial A.; Donovan, David C.; Duran, Jonah; Elder, J. D.; Glass, Fenton; Grierson, B. A.; Guo, H. Y.; Hall, T.; Ma, Xinxing; Maurizio, Roberto; McLean, A. G.; Murphy, Christopher; Nguyen, R.; Rudakov, D. L.; Stangeby, Peter C.; Thomas, D. M.; Zamperini, Shawn A.

doi:10.1088/1402-4896/ac3c5f

Title: Design and physics basis for the upcoming DIII-D SAS-VW campaign to quantify tungsten leakage and transport in a new slot divertor geometry

Abstract

A set of experiments are planned to exploit the high SOL collisionality enabled by a tightly baffled slot divertor geometry to suppress tungsten leakage in DIII-D. A toroidal row of graphite tiles from the Small Angle Slot (SAS) divertor is being coated with 10–15 μm of tungsten. New spectroscopic viewing chords with in-vacuo optics will measure the W gross erosion source from the divertor surface with high spatial and temporal resolution. In parallel, the bottom of the SAS divertor is changed from a flat to a ‘V’ shape. New SOLPS-ITER/DIVIMP simulations conducted with drifts using the planned ‘V’ shape predict a substantial reduction in W sourcing and SOL accumulation in either B × ∇B direction relative to either the old SAS divertor shape or the open, lower divertor. Dedicated studies are planned to carefully characterize the level of W sourcing, leakage, and scrape-off-layer (SOL) accumulation in DIII-D over a wide range of plasma scenarios. Various actuators will be assessed for their efficacy in further reducing high-Z impurity sources and leakage from the slot divertor geometry. Finally, this coupled code-experiment validation effort will be used to stress-test physics models and build confidence in extrapolations to advanced, high-Z divertor geometries for next-stepmore » devices.« less

Authors:

^[1];

^[1]; Nichols, Jake H. ^[2];

^[3];

^[4];

^[5]; Elder, J. D. ^[6];

^[1];

^[7]; Guo, H. Y. ^[1]; Hall, T. ^[1];

^[8];

^[8]; McLean, A. G. ^[9]; Murphy, Christopher ^[1]; Nguyen, R. ^[1];

^[10]; Stangeby, Peter C. ^[6]; Thomas, D. M. ^[1];

^[1]

General Atomics, San Diego, CA (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Univ. of Tennessee, Knoxville, TN (United States)
Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Univ. of Toronto, ON (Canada)
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Oak Ridge Associated Universities (ORAU), Oak Ridge, TN
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Univ. of California, San Diego, CA (United States)

Publication Date:: Wed Dec 08 00:00:00 EST 2021

Research Org.:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Org.:: USDOE Office of Science (SC), Fusion Energy Sciences (FES)

OSTI Identifier:: 1890286

Grant/Contract Number:: AC05-00OR22725; FC02-04ER54698; SC0019256; AC02-09CH11466; AC52- 07NA27344; FG02-07ER54917

Resource Type:: Accepted Manuscript

Journal Name:: Physica Scripta

Additional Journal Information:: Journal Volume: 96; Journal Issue: 12; Journal ID: ISSN 0031-8949

Publisher:: IOP Publishing

Country of Publication:: United States

Language:: English

Subject:: 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; tungsten; DIII-D; divertors; SOLPS; DIVIMP; spectroscopy; tokamaks

Citation Formats


                    Abrams, Tyler, Sinclair, Greg, Nichols, Jake H., Unterberg, Ezekial A., Donovan, David C., Duran, Jonah, Elder, J. D., Glass, Fenton, Grierson, B. A., Guo, H. Y., Hall, T., Ma, Xinxing, Maurizio, Roberto, McLean, A. G., Murphy, Christopher, Nguyen, R., Rudakov, D. L., Stangeby, Peter C., Thomas, D. M., and Zamperini, Shawn A. Design and physics basis for the upcoming DIII-D SAS-VW campaign to quantify tungsten leakage and transport in a new slot divertor geometry.  United States: N. p., 2021. 
Web.  doi:10.1088/1402-4896/ac3c5f.

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                    Abrams, Tyler, Sinclair, Greg, Nichols, Jake H., Unterberg, Ezekial A., Donovan, David C., Duran, Jonah, Elder, J. D., Glass, Fenton, Grierson, B. A., Guo, H. Y., Hall, T., Ma, Xinxing, Maurizio, Roberto, McLean, A. G., Murphy, Christopher, Nguyen, R., Rudakov, D. L., Stangeby, Peter C., Thomas, D. M., & Zamperini, Shawn A. Design and physics basis for the upcoming DIII-D SAS-VW campaign to quantify tungsten leakage and transport in a new slot divertor geometry.  United States.  https://doi.org/10.1088/1402-4896/ac3c5f

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                    Abrams, Tyler, Sinclair, Greg, Nichols, Jake H., Unterberg, Ezekial A., Donovan, David C., Duran, Jonah, Elder, J. D., Glass, Fenton, Grierson, B. A., Guo, H. Y., Hall, T., Ma, Xinxing, Maurizio, Roberto, McLean, A. G., Murphy, Christopher, Nguyen, R., Rudakov, D. L., Stangeby, Peter C., Thomas, D. M., and Zamperini, Shawn A. Wed .  
"Design and physics basis for the upcoming DIII-D SAS-VW campaign to quantify tungsten leakage and transport in a new slot divertor geometry".  United States.  https://doi.org/10.1088/1402-4896/ac3c5f.  https://www.osti.gov/servlets/purl/1890286.

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@article{osti_1890286,

  title        = {Design and physics basis for the upcoming DIII-D SAS-VW campaign to quantify tungsten leakage and transport in a new slot divertor geometry},

  author       = {Abrams, Tyler and Sinclair, Greg and Nichols, Jake H. and Unterberg, Ezekial A. and Donovan, David C. and Duran, Jonah and Elder, J. D. and Glass, Fenton and Grierson, B. A. and Guo, H. Y. and Hall, T. and Ma, Xinxing and Maurizio, Roberto and McLean, A. G. and Murphy, Christopher and Nguyen, R. and Rudakov, D. L. and Stangeby, Peter C. and Thomas, D. M. and Zamperini, Shawn A.},

  abstractNote = {A set of experiments are planned to exploit the high SOL collisionality enabled by a tightly baffled slot divertor geometry to suppress tungsten leakage in DIII-D. A toroidal row of graphite tiles from the Small Angle Slot (SAS) divertor is being coated with 10–15 μm of tungsten. New spectroscopic viewing chords with in-vacuo optics will measure the W gross erosion source from the divertor surface with high spatial and temporal resolution. In parallel, the bottom of the SAS divertor is changed from a flat to a ‘V’ shape. New SOLPS-ITER/DIVIMP simulations conducted with drifts using the planned ‘V’ shape predict a substantial reduction in W sourcing and SOL accumulation in either B × ∇B direction relative to either the old SAS divertor shape or the open, lower divertor. Dedicated studies are planned to carefully characterize the level of W sourcing, leakage, and scrape-off-layer (SOL) accumulation in DIII-D over a wide range of plasma scenarios. Various actuators will be assessed for their efficacy in further reducing high-Z impurity sources and leakage from the slot divertor geometry. Finally, this coupled code-experiment validation effort will be used to stress-test physics models and build confidence in extrapolations to advanced, high-Z divertor geometries for next-step devices.},

  doi          = {10.1088/1402-4896/ac3c5f},

  journal      = {Physica Scripta},

  number       = 12,

  volume       = 96,

  place        = {United States},

  year         = {Wed Dec 08 00:00:00 EST 2021},

  month        = {Wed Dec 08 00:00:00 EST 2021}

}

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Title: Design and physics basis for the upcoming DIII-D SAS-VW campaign to quantify tungsten leakage and transport in a new slot divertor geometry

Abstract

Citation Formats

Tungsten coatings deposited on CFC tiles by the combined magnetron sputtering and ion implantation technique journal, March 2007

Localized divertor leakage measurements using isotopic tungsten sources during edge-localized mode-y H-mode discharges on DIII-D journal, November 2019

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Evaluation of the impact of divertor closure on high-Z material transport and leakage in small angle slot divertor with toroidal tungsten rings in DIII-D journal, January 2020

Impact of ELM control techniques on tungsten sputtering in the DIII-D divertor and extrapolations to ITER journal, June 2019

Dynamic control of low-Z material deposition and tungsten erosion by strike point sweeping on DIII-D journal, August 2017

Divertor materials evaluation system at DIII-D journal, December 1992

Progress of the CFETR design journal, June 2019

Determination of the tolerable impurity concentrations in a fusion reactor using a consistent set of cooling factors journal, March 2019

Physics basis for the first ITER tungsten divertor journal, August 2019

A solid tungsten divertor for ASDEX Upgrade journal, December 2011

JET ITER-like wall—overview and experimental programme journal, December 2011

Utilization of outer-midplane collector probes with isotopically enriched tungsten tracer particles for impurity transport studies in the scrape-off layer of DIII-D (invited) journal, October 2018

Evidence of near-SOL tungsten accumulation using a far-SOL collector probe array and OEDGE modelling in the DIII-D metal rings L-mode discharges journal, May 2019

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Localized divertor leakage measurements using isotopic tungsten sources during edge-localized mode-y H-mode discharges on DIII-D
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Development of Surface Eroding Thermocouples in Small Angle Slot Divertor in DIII-D
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Evaluation of the impact of divertor closure on high-Z material transport and leakage in small angle slot divertor with toroidal tungsten rings in DIII-D
journal, January 2020

Impact of ELM control techniques on tungsten sputtering in the DIII-D divertor and extrapolations to ITER
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Dynamic control of low-Z material deposition and tungsten erosion by strike point sweeping on DIII-D
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Divertor materials evaluation system at DIII-D
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Progress of the CFETR design
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