High-Z material erosion and its control in DIII-D carbon divertor

Ding, Rui; Rudakov, Dimitry L.; Stangeby, Peter C.; Wampler, William R.; Abrams, Tyler; Brezinsek, S.; Briesemeister, Alexis R.; Bykov, Igor; Chan, Vincent S.; Chrobak, Chris P.; Elder, J. David; Guo, Houyang Y.; Guterl, Jerome; Kirschner, A.; Lasnier, Charles J.; Leonard, Anthony W.; Makowski, Michael A.; McLean, Adam G.; Snyder, Philip B.; Thomas, Dan M.; Tskhakaya, D.; Unterberg, Ezekial A.; Wang, H. Q.; Watkins, Jerome G.

doi:10.1016/j.nme.2017.03.012

Title: High-Z material erosion and its control in DIII-D carbon divertor

Journal Article · Thu Mar 16 00:00:00 EDT 2017 · Nuclear Materials and Energy

DOI: https://doi.org/10.1016/j.nme.2017.03.012 · OSTI ID:1374815

Ding, Rui ^[1]; Rudakov, Dimitry L. ^[2]; Stangeby, Peter C. ^[3]; Wampler, William R. ^[4]; Abrams, Tyler ^[5]; Brezinsek, S. ^[6]; Briesemeister, Alexis R. ^[7]; Bykov, Igor ^[2]; Chan, Vincent S. ^[8]; Chrobak, Chris P. ^[8]; Elder, J. David ^[9]; Guo, Houyang Y. ^[8]; Guterl, Jerome ^[5]; Kirschner, A. ^[6]; Lasnier, Charles J. ^[10]; Leonard, Anthony W. ^[8]; Makowski, Michael A. ^[10]; McLean, Adam G. ^[10]; Snyder, Philip B. ^[8]; Thomas, Dan M. ^[8] more »

Oak Ridge Associated Univ., Oak Ridge, TN (United States); Chinese Academy of Sciences (CAS), Hefei (China). Inst. of Plasma Physics; General Atomics
Univ. of California, San Diego, CA (United States)
Univ. of Toronto, ON (Canada). Canadian Inst. for Aerospace Studies
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Oak Ridge Associated Univ., Oak Ridge, TN (United States)
Forschungszentrum Julich (Germany). Inst. for Energy and Climate Research (IEK), Plasma Physics
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
General Atomics, San Diego, CA (United States)
Univ. of Toronto, ON (Canada). Canadian Inst. for Aerospace Studies
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Technische Univ. Wien, Vienna (Austria). Fusion@OAW, Inst. of Applied Physics; Univ. of Innsbruck (Austria). Inst. for Theoretical Physics

It is expected that high-Z materials will be used as plasma-facing components (PFCs) in future fusion devices, making the erosion of high-Z material a key issue for high-power, long pulse operation. High-Z material erosion and redeposition have been studied using tungsten and molybdenum coated samples exposed in well-diagnosed DIII-D divertor plasma discharges. By coupling dedicated experiments and modelling using the 3D Monte Carlo code ERO, the roles of sheath potential and background carbon impurities in determining high-Z material erosion are identified. Different methods suggested by modelling have been investigated to control high-Z material erosion in DIII-D experiments. The erosion of Mo and W are found to be strongly suppressed by local injection of methane and deuterium gases. The ¹³C deposition resulting from local ¹³CH₄ injection also provides information on radial transport due to E×B drifts and cross field diffusion. Finally, D₂ gas puffing is found to cause 2 local plasma perturbation, suppressing W erosion because of the lower effective sputtering yield of W at lower plasma temperature and for higher carbon concentration in the mixed surface layer.

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

Sponsoring Organization:: USDOE Office of Nuclear Energy (NE); USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24); National Magnetic Confinement Fusion Science Program of China; National Natural Science Foundation of China

Grant/Contract Number:: FC02-04ER54698; SC0008698; AC05-06OR23100; FG02-07ER54917; AC05-00OR22725; AC04-94AL85000

OSTI ID:: 1374815

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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Reduced model of high-Z impurity redeposition and erosion in tokamak divertor and its application to DIII-D experiments Guterl, J.; Wampler, W. R.; Rudakov, D. Plasma Physics and Controlled Fusion, Vol. 61, Issue 12 https://doi.org/10.1088/1361-6587/ab5144	journal	November 2019

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