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Asymmetric amplitude–frequency behavior of rotating MHD instabilities during acceleration and deceleration phases in tokamak and helical plasmas.

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Title: Asymmetric amplitude–frequency behavior of rotating MHD instabilities during acceleration and deceleration phases in tokamak and helical plasmas.
Authors: Takemura, Y.1,2 (AUTHOR) takemura.yuki@nifs.ac.jp, Watanabe, K.Y.1,3 (AUTHOR) watanabe.kiyomasa@nifs.ac.jp, Isayama, A.4 (AUTHOR) isayama.akihiko@qst.go.jp, Matsunaga, G.4 (AUTHOR) matsunaga.go@qst.go.jp, Shibata, Y.5 (AUTHOR) shibata.yoshihide@gifu-nct.ac.jp
Source: Nuclear Fusion. 2026, Vol. 66 Issue 7, p1-9. 9p.
Subjects: Magnetohydrodynamic instabilities, Tokamaks, Magnetohydrodynamics, Plasma confinement, Frequencies of oscillating systems, Torque, Plasma instabilities, Toroidal plasma
Abstract: Magnetohydrodynamic (MHD) instabilities accompanied by magnetic islands in toroidal confinement devices are a major cause of energy confinement degradation and plasma disruptions. Since the amplitude of magnetic fluctuations increases as the mode rotation frequency decreases, clarification and control of rotational dynamics of MHD instabilities are of critical importance. Conventionally, these dynamics have been interpreted using torque balance models based on the competition between electromagnetic torques induced by external magnetic perturbations and driving torques in the plasma. However, recent experiments in JT-60U and LHD have revealed a characteristic evolution in which the rotation frequency of an MHD instability decelerates and subsequently accelerates. This behavior cannot be explained within the framework of a single torque balance model. The present work describes the features of this newly observed phenomenon. [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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DbLabel: Engineering Source
An: 194261844
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PubTypeId: academicJournal
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  Label: Title
  Group: Ti
  Data: Asymmetric amplitude–frequency behavior of rotating MHD instabilities during acceleration and deceleration phases in tokamak and helical plasmas.
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  Data: <searchLink fieldCode="AR" term="%22Takemura%2C+Y%2E%22">Takemura, Y.</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> takemura.yuki@nifs.ac.jp</i><br /><searchLink fieldCode="AR" term="%22Watanabe%2C+K%2EY%2E%22">Watanabe, K.Y.</searchLink><relatesTo>1,3</relatesTo> (AUTHOR)<i> watanabe.kiyomasa@nifs.ac.jp</i><br /><searchLink fieldCode="AR" term="%22Isayama%2C+A%2E%22">Isayama, A.</searchLink><relatesTo>4</relatesTo> (AUTHOR)<i> isayama.akihiko@qst.go.jp</i><br /><searchLink fieldCode="AR" term="%22Matsunaga%2C+G%2E%22">Matsunaga, G.</searchLink><relatesTo>4</relatesTo> (AUTHOR)<i> matsunaga.go@qst.go.jp</i><br /><searchLink fieldCode="AR" term="%22Shibata%2C+Y%2E%22">Shibata, Y.</searchLink><relatesTo>5</relatesTo> (AUTHOR)<i> shibata.yoshihide@gifu-nct.ac.jp</i>
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  Data: <searchLink fieldCode="JN" term="%22Nuclear+Fusion%22">Nuclear Fusion</searchLink>. 2026, Vol. 66 Issue 7, p1-9. 9p.
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  Data: <searchLink fieldCode="DE" term="%22Magnetohydrodynamic+instabilities%22">Magnetohydrodynamic instabilities</searchLink><br /><searchLink fieldCode="DE" term="%22Tokamaks%22">Tokamaks</searchLink><br /><searchLink fieldCode="DE" term="%22Magnetohydrodynamics%22">Magnetohydrodynamics</searchLink><br /><searchLink fieldCode="DE" term="%22Plasma+confinement%22">Plasma confinement</searchLink><br /><searchLink fieldCode="DE" term="%22Frequencies+of+oscillating+systems%22">Frequencies of oscillating systems</searchLink><br /><searchLink fieldCode="DE" term="%22Torque%22">Torque</searchLink><br /><searchLink fieldCode="DE" term="%22Plasma+instabilities%22">Plasma instabilities</searchLink><br /><searchLink fieldCode="DE" term="%22Toroidal+plasma%22">Toroidal plasma</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Magnetohydrodynamic (MHD) instabilities accompanied by magnetic islands in toroidal confinement devices are a major cause of energy confinement degradation and plasma disruptions. Since the amplitude of magnetic fluctuations increases as the mode rotation frequency decreases, clarification and control of rotational dynamics of MHD instabilities are of critical importance. Conventionally, these dynamics have been interpreted using torque balance models based on the competition between electromagnetic torques induced by external magnetic perturbations and driving torques in the plasma. However, recent experiments in JT-60U and LHD have revealed a characteristic evolution in which the rotation frequency of an MHD instability decelerates and subsequently accelerates. This behavior cannot be explained within the framework of a single torque balance model. The present work describes the features of this newly observed phenomenon. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  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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RecordInfo BibRecord:
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      – Type: doi
        Value: 10.1088/1741-4326/ae6f32
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      – Code: eng
        Text: English
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        PageCount: 9
        StartPage: 1
    Subjects:
      – SubjectFull: Magnetohydrodynamic instabilities
        Type: general
      – SubjectFull: Tokamaks
        Type: general
      – SubjectFull: Magnetohydrodynamics
        Type: general
      – SubjectFull: Plasma confinement
        Type: general
      – SubjectFull: Frequencies of oscillating systems
        Type: general
      – SubjectFull: Torque
        Type: general
      – SubjectFull: Plasma instabilities
        Type: general
      – SubjectFull: Toroidal plasma
        Type: general
    Titles:
      – TitleFull: Asymmetric amplitude–frequency behavior of rotating MHD instabilities during acceleration and deceleration phases in tokamak and helical plasmas.
        Type: main
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            NameFull: Takemura, Y.
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            NameFull: Watanabe, K.Y.
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            NameFull: Isayama, A.
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            – D: 01
              M: 07
              Text: 2026
              Type: published
              Y: 2026
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              Value: 66
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              Value: 7
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