Modification of the magneto-hydrodynamic equilibrium by the lower-hybrid wave driven fast electrons on the TST-2 spherical tokamak

N. Tsujii; Y. Takase; A. Ejiri; O. Watanabe; H. Yamazaki; Y. Peng; K. Iwasaki; Y. Aoi; Y. Ko; K. Matsuzaki; J. H.P. Rice; Y. Osawa; C. P. Moeller; Y. Yoshimura

doi:10.1088/1741-4326/ac217d

Modification of the magneto-hydrodynamic equilibrium by the lower-hybrid wave driven fast electrons on the TST-2 spherical tokamak

N. Tsujii^*, Y. Takase, A. Ejiri, O. Watanabe, H. Yamazaki, Y. Peng, K. Iwasaki, Y. Aoi, Y. Ko, K. Matsuzaki, J. H.P. Rice, Y. Osawa, C. P. Moeller, Y. Yoshimura

^*Corresponding author for this work

Biochemistry and Molecular Genetics

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Abstract

Presence of a large population of fast particles may qualitatively modify the tokamak equilibrium from the one that can be described by standard magneto-hydrodynamics (MHD). The kinetic modification of the MHD equilibrium was studied for a lower-hybrid (LH) wave driven plasma on the TST-2 spherical tokamak. The analysis was performed using an equilibrium reconstruction method based on an extended MHD model that considers a two-component plasma of bulk MHD fluid and kinetic fast electrons. Scrape-off-layer current appeared naturally in the extended MHD analysis because of the finite electron orbit excursion from the flux surfaces. This reduced the bulk pressure contribution to the toroidal current substantially. The resulting poloidal flux profile was more consistent with that inferred from the Thomson scattering measurement.

Original language	English (US)
Article number	116047
Journal	Nuclear Fusion
Volume	61
Issue number	11
DOIs	https://doi.org/10.1088/1741-4326/ac217d
State	Published - Nov 2021

ASJC Scopus subject areas

Nuclear and High Energy Physics
Condensed Matter Physics

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10.1088/1741-4326/ac217d

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Tsujii, N., Takase, Y., Ejiri, A., Watanabe, O., Yamazaki, H., Peng, Y., Iwasaki, K., Aoi, Y., Ko, Y., Matsuzaki, K., Rice, J. H. P., Osawa, Y., Moeller, C. P., & Yoshimura, Y. (2021). Modification of the magneto-hydrodynamic equilibrium by the lower-hybrid wave driven fast electrons on the TST-2 spherical tokamak. Nuclear Fusion, 61(11), Article 116047. https://doi.org/10.1088/1741-4326/ac217d

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title = "Modification of the magneto-hydrodynamic equilibrium by the lower-hybrid wave driven fast electrons on the TST-2 spherical tokamak",

abstract = "Presence of a large population of fast particles may qualitatively modify the tokamak equilibrium from the one that can be described by standard magneto-hydrodynamics (MHD). The kinetic modification of the MHD equilibrium was studied for a lower-hybrid (LH) wave driven plasma on the TST-2 spherical tokamak. The analysis was performed using an equilibrium reconstruction method based on an extended MHD model that considers a two-component plasma of bulk MHD fluid and kinetic fast electrons. Scrape-off-layer current appeared naturally in the extended MHD analysis because of the finite electron orbit excursion from the flux surfaces. This reduced the bulk pressure contribution to the toroidal current substantially. The resulting poloidal flux profile was more consistent with that inferred from the Thomson scattering measurement.",

author = "N. Tsujii and Y. Takase and A. Ejiri and O. Watanabe and H. Yamazaki and Y. Peng and K. Iwasaki and Y. Aoi and Y. Ko and K. Matsuzaki and Rice, {J. H.P.} and Y. Osawa and Moeller, {C. P.} and Y. Yoshimura",

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Tsujii, N, Takase, Y, Ejiri, A, Watanabe, O, Yamazaki, H, Peng, Y, Iwasaki, K, Aoi, Y, Ko, Y, Matsuzaki, K, Rice, JHP, Osawa, Y, Moeller, CP & Yoshimura, Y 2021, 'Modification of the magneto-hydrodynamic equilibrium by the lower-hybrid wave driven fast electrons on the TST-2 spherical tokamak', Nuclear Fusion, vol. 61, no. 11, 116047. https://doi.org/10.1088/1741-4326/ac217d

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AU - Tsujii, N.

AU - Takase, Y.

AU - Ejiri, A.

AU - Watanabe, O.

AU - Yamazaki, H.

AU - Peng, Y.

AU - Iwasaki, K.

AU - Aoi, Y.

AU - Ko, Y.

AU - Matsuzaki, K.

AU - Rice, J. H.P.

AU - Osawa, Y.

AU - Moeller, C. P.

AU - Yoshimura, Y.

PY - 2021/11

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N2 - Presence of a large population of fast particles may qualitatively modify the tokamak equilibrium from the one that can be described by standard magneto-hydrodynamics (MHD). The kinetic modification of the MHD equilibrium was studied for a lower-hybrid (LH) wave driven plasma on the TST-2 spherical tokamak. The analysis was performed using an equilibrium reconstruction method based on an extended MHD model that considers a two-component plasma of bulk MHD fluid and kinetic fast electrons. Scrape-off-layer current appeared naturally in the extended MHD analysis because of the finite electron orbit excursion from the flux surfaces. This reduced the bulk pressure contribution to the toroidal current substantially. The resulting poloidal flux profile was more consistent with that inferred from the Thomson scattering measurement.

AB - Presence of a large population of fast particles may qualitatively modify the tokamak equilibrium from the one that can be described by standard magneto-hydrodynamics (MHD). The kinetic modification of the MHD equilibrium was studied for a lower-hybrid (LH) wave driven plasma on the TST-2 spherical tokamak. The analysis was performed using an equilibrium reconstruction method based on an extended MHD model that considers a two-component plasma of bulk MHD fluid and kinetic fast electrons. Scrape-off-layer current appeared naturally in the extended MHD analysis because of the finite electron orbit excursion from the flux surfaces. This reduced the bulk pressure contribution to the toroidal current substantially. The resulting poloidal flux profile was more consistent with that inferred from the Thomson scattering measurement.

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Modification of the magneto-hydrodynamic equilibrium by the lower-hybrid wave driven fast electrons on the TST-2 spherical tokamak

Abstract

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