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Comparison of plasma response models for RMP effects on the divertor and scrape-off layer in KSTAR.

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Title: Comparison of plasma response models for RMP effects on the divertor and scrape-off layer in KSTAR.
Authors: Frerichs, H.1 (AUTHOR) hfrerichs@wisc.edu, Van Blarcum, J.2 (AUTHOR), Cote, T.3 (AUTHOR), Kim, S.K.4 (AUTHOR), Liu, Y.Q.3 (AUTHOR), Yang, S.M.4 (AUTHOR)
Source: Nuclear Fusion. 2026, Vol. 66 Issue 7, p1-11. 11p.
Subjects: Tokamaks, Heating load, Plasma interactions, Plasma boundary layers
Abstract: Resonant magnetic perturbations (RMPs) are beneficial for control of edge localized modes (ELMs) in tokamaks. Nevertheless, a side effect of RMPs is the appearance of helical striations in the particle and heat loads onto divertor targets. The extent and field line connection of these striations is significantly altered by the plasma response to external perturbations. For an ELM suppressed high confinement (H-mode) plasma at KSTAR, magnetic footprints are computed by FLARE based on plasma response from GPEC, MARS-F, M3D-C1 and JOREK with substantial differences in the resulting footprints (from 2 cm to 14 cm). This is reflected in EMC3-EIRENE simulations of the resulting heat loads: it is found that either the peak value or the extent of the striations appears to be overestimated compared to infrared camera measurements. Reasonable agreement can only be achieved for the smallest footprint for lower input power and lower cross-field transport, or for higher upstream density and radiative power losses. [ABSTRACT FROM AUTHOR]
Copyright of Nuclear 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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  Data: Comparison of plasma response models for RMP effects on the divertor and scrape-off layer in KSTAR.
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  Data: <searchLink fieldCode="AR" term="%22Frerichs%2C+H%2E%22">Frerichs, H.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> hfrerichs@wisc.edu</i><br /><searchLink fieldCode="AR" term="%22Van+Blarcum%2C+J%2E%22">Van Blarcum, J.</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Cote%2C+T%2E%22">Cote, T.</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Kim%2C+S%2EK%2E%22">Kim, S.K.</searchLink><relatesTo>4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Liu%2C+Y%2EQ%2E%22">Liu, Y.Q.</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Yang%2C+S%2EM%2E%22">Yang, S.M.</searchLink><relatesTo>4</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Nuclear+Fusion%22">Nuclear Fusion</searchLink>. 2026, Vol. 66 Issue 7, p1-11. 11p.
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  Data: <searchLink fieldCode="DE" term="%22Tokamaks%22">Tokamaks</searchLink><br /><searchLink fieldCode="DE" term="%22Heating+load%22">Heating load</searchLink><br /><searchLink fieldCode="DE" term="%22Plasma+interactions%22">Plasma interactions</searchLink><br /><searchLink fieldCode="DE" term="%22Plasma+boundary+layers%22">Plasma boundary layers</searchLink>
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  Data: Resonant magnetic perturbations (RMPs) are beneficial for control of edge localized modes (ELMs) in tokamaks. Nevertheless, a side effect of RMPs is the appearance of helical striations in the particle and heat loads onto divertor targets. The extent and field line connection of these striations is significantly altered by the plasma response to external perturbations. For an ELM suppressed high confinement (H-mode) plasma at KSTAR, magnetic footprints are computed by FLARE based on plasma response from GPEC, MARS-F, M3D-C1 and JOREK with substantial differences in the resulting footprints (from 2 cm to 14 cm). This is reflected in EMC3-EIRENE simulations of the resulting heat loads: it is found that either the peak value or the extent of the striations appears to be overestimated compared to infrared camera measurements. Reasonable agreement can only be achieved for the smallest footprint for lower input power and lower cross-field transport, or for higher upstream density and radiative power losses. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Nuclear 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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      – Code: eng
        Text: English
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        Type: general
      – SubjectFull: Heating load
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      – SubjectFull: Plasma interactions
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      – SubjectFull: Plasma boundary layers
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              Text: 2026
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