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Modelling dust transport in DIII-D with DTOKS-Upgrade.

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Title: Modelling dust transport in DIII-D with DTOKS-Upgrade.
Authors: Simons, L (AUTHOR) ls5115@ic.ac.uk, Cowley, C (AUTHOR), Fuller, P (AUTHOR), Bykov, I (AUTHOR), Rudakov, D (AUTHOR), Andrew, Y (AUTHOR), Coppins, M (AUTHOR)
Source: Plasma Physics & Controlled Fusion. Apr2021, Vol. 63 Issue 4, p1-13. 13p.
Subjects: Fusion reactor divertors, Dust, Carbon offsetting, Dust measurement, Thermal expansion, Tokamaks, Stochastic models
Abstract: Comprehensive upgrades to the dust transport code Dust in TOKamaks (DTOKS) that extend the plasma-dust interaction model are presented and compared with recent measurements of dust transport in DIII-D. Simulations incorporating variation in physical properties of graphite dust with temperature and size in a stationary plasma background suggest a substantial decrease in lifetimes due principally to thermal expansion. The trajectories of 53 dust grains identified from analysis of visible camera data taken across two similar shots were used to measure the dust particle velocity distributions. Dust tracks terminated mostly at the outer divertor strike point having a mean observation time of 2.1 ± 0.4 ms. Stochastic modelling of 200 graphite dust particles in the DIII-D tokamak performed with DTOKS-U using plasma simulations generated by OEDGE found similar behaviour, with particles ablating rapidly after acquiring a positive charge in the region close to the outer strike point, creating an acute source of neutral carbon atoms. The simulated mean lifetime, 11 ± 2 ms, showed approximate agreement with experimental observation when corrected by accounting for dust visibility and ignoring the longest trajectories 1.5 ± 0.2 ms. Synthetic diagnostic data generated from coupling the results of DTOKS-U with the visualisation software Calcam offers a powerful new tool for validation of simulations and predictive calculations of dust dynamics. [ABSTRACT FROM AUTHOR]
Copyright of Plasma Physics & Controlled Fusion is the property of IOP Publishing and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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DbLabel: Engineering Source
An: 149806658
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PubTypeId: academicJournal
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  Data: Modelling dust transport in DIII-D with DTOKS-Upgrade.
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  Data: <searchLink fieldCode="AR" term="%22Simons%2C+L%22">Simons, L</searchLink> (AUTHOR)<i> ls5115@ic.ac.uk</i><br /><searchLink fieldCode="AR" term="%22Cowley%2C+C%22">Cowley, C</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Fuller%2C+P%22">Fuller, P</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Bykov%2C+I%22">Bykov, I</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Rudakov%2C+D%22">Rudakov, D</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Andrew%2C+Y%22">Andrew, Y</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Coppins%2C+M%22">Coppins, M</searchLink> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Plasma+Physics+%26+Controlled+Fusion%22">Plasma Physics & Controlled Fusion</searchLink>. Apr2021, Vol. 63 Issue 4, p1-13. 13p.
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  Data: <searchLink fieldCode="DE" term="%22Fusion+reactor+divertors%22">Fusion reactor divertors</searchLink><br /><searchLink fieldCode="DE" term="%22Dust%22">Dust</searchLink><br /><searchLink fieldCode="DE" term="%22Carbon+offsetting%22">Carbon offsetting</searchLink><br /><searchLink fieldCode="DE" term="%22Dust+measurement%22">Dust measurement</searchLink><br /><searchLink fieldCode="DE" term="%22Thermal+expansion%22">Thermal expansion</searchLink><br /><searchLink fieldCode="DE" term="%22Tokamaks%22">Tokamaks</searchLink><br /><searchLink fieldCode="DE" term="%22Stochastic+models%22">Stochastic models</searchLink>
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  Label: Abstract
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  Data: Comprehensive upgrades to the dust transport code Dust in TOKamaks (DTOKS) that extend the plasma-dust interaction model are presented and compared with recent measurements of dust transport in DIII-D. Simulations incorporating variation in physical properties of graphite dust with temperature and size in a stationary plasma background suggest a substantial decrease in lifetimes due principally to thermal expansion. The trajectories of 53 dust grains identified from analysis of visible camera data taken across two similar shots were used to measure the dust particle velocity distributions. Dust tracks terminated mostly at the outer divertor strike point having a mean observation time of 2.1 ± 0.4 ms. Stochastic modelling of 200 graphite dust particles in the DIII-D tokamak performed with DTOKS-U using plasma simulations generated by OEDGE found similar behaviour, with particles ablating rapidly after acquiring a positive charge in the region close to the outer strike point, creating an acute source of neutral carbon atoms. The simulated mean lifetime, 11 ± 2 ms, showed approximate agreement with experimental observation when corrected by accounting for dust visibility and ignoring the longest trajectories 1.5 ± 0.2 ms. Synthetic diagnostic data generated from coupling the results of DTOKS-U with the visualisation software Calcam offers a powerful new tool for validation of simulations and predictive calculations of dust dynamics. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
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  Data: <i>Copyright of Plasma Physics & Controlled Fusion is the property of IOP Publishing and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1088/1361-6587/abdb8b
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      – Code: eng
        Text: English
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        PageCount: 13
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    Subjects:
      – SubjectFull: Fusion reactor divertors
        Type: general
      – SubjectFull: Dust
        Type: general
      – SubjectFull: Carbon offsetting
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      – SubjectFull: Dust measurement
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      – SubjectFull: Thermal expansion
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      – SubjectFull: Tokamaks
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      – SubjectFull: Stochastic models
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      – TitleFull: Modelling dust transport in DIII-D with DTOKS-Upgrade.
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              Text: Apr2021
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              Y: 2021
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              Value: 63
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