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Intermittent helicity injection for field-reversed configurations control: shear-driven tilt suppression and ion heating.

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Title: Intermittent helicity injection for field-reversed configurations control: shear-driven tilt suppression and ion heating.
Authors: Ahmadi, T.1 (AUTHOR) tara@ts.t.u-tokyo.ac.jp, Ono, Y.1 (AUTHOR), Tanabe, H.1 (AUTHOR)
Source: Nuclear Fusion. 2026, Vol. 66 Issue 1, p1-8. 8p.
Subjects: Spheromaks, Plasma heating, Magnetohydrodynamics, Magnetic control, Magnetic reconnection, Magnetohydrodynamic instabilities
Abstract: The sustainment of field-reversed configurations through controlled magnetic merging is investigated using three-dimensional Hall magnetohydrodynamic simulations. Motivated by experimental demonstrations of tilt-stable field-reversed configuration (FRC) formation via counter-helicity merging, this study explores the impact of intermittent injection of spheromak and FRC-type plasmas into a pre-formed FRC core. Two merging strategies are considered: (i) the injection of compact spheromaks and (ii) the merging of externally generated FRCs. The results indicate that spheromak-FRC merging produces localized reconnection and strong bi-directional toroidal shear flows, which effectively suppress the n = 1 tilt mode and generate significant ion heating. In contrast, FRC–FRC merging yields weaker reconnection-driven flows and reduced thermalization, resulting in lower ion temperature increments and incomplete suppression of global MHD instabilities. A parametric study of the injection (compression) speed reveals a trade-off between energy deposition and stability, with optimal performance observed at intermediate velocities. [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: 189014176
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  Data: Intermittent helicity injection for field-reversed configurations control: shear-driven tilt suppression and ion heating.
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  Data: <searchLink fieldCode="AR" term="%22Ahmadi%2C+T%2E%22">Ahmadi, T.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> tara@ts.t.u-tokyo.ac.jp</i><br /><searchLink fieldCode="AR" term="%22Ono%2C+Y%2E%22">Ono, Y.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Tanabe%2C+H%2E%22">Tanabe, H.</searchLink><relatesTo>1</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Nuclear+Fusion%22">Nuclear Fusion</searchLink>. 2026, Vol. 66 Issue 1, p1-8. 8p.
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  Data: <searchLink fieldCode="DE" term="%22Spheromaks%22">Spheromaks</searchLink><br /><searchLink fieldCode="DE" term="%22Plasma+heating%22">Plasma heating</searchLink><br /><searchLink fieldCode="DE" term="%22Magnetohydrodynamics%22">Magnetohydrodynamics</searchLink><br /><searchLink fieldCode="DE" term="%22Magnetic+control%22">Magnetic control</searchLink><br /><searchLink fieldCode="DE" term="%22Magnetic+reconnection%22">Magnetic reconnection</searchLink><br /><searchLink fieldCode="DE" term="%22Magnetohydrodynamic+instabilities%22">Magnetohydrodynamic instabilities</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: The sustainment of field-reversed configurations through controlled magnetic merging is investigated using three-dimensional Hall magnetohydrodynamic simulations. Motivated by experimental demonstrations of tilt-stable field-reversed configuration (FRC) formation via counter-helicity merging, this study explores the impact of intermittent injection of spheromak and FRC-type plasmas into a pre-formed FRC core. Two merging strategies are considered: (i) the injection of compact spheromaks and (ii) the merging of externally generated FRCs. The results indicate that spheromak-FRC merging produces localized reconnection and strong bi-directional toroidal shear flows, which effectively suppress the n = 1 tilt mode and generate significant ion heating. In contrast, FRC–FRC merging yields weaker reconnection-driven flows and reduced thermalization, resulting in lower ion temperature increments and incomplete suppression of global MHD instabilities. A parametric study of the injection (compression) speed reveals a trade-off between energy deposition and stability, with optimal performance observed at intermediate velocities. [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/ae11c7
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      – Code: eng
        Text: English
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        PageCount: 8
        StartPage: 1
    Subjects:
      – SubjectFull: Spheromaks
        Type: general
      – SubjectFull: Plasma heating
        Type: general
      – SubjectFull: Magnetohydrodynamics
        Type: general
      – SubjectFull: Magnetic control
        Type: general
      – SubjectFull: Magnetic reconnection
        Type: general
      – SubjectFull: Magnetohydrodynamic instabilities
        Type: general
    Titles:
      – TitleFull: Intermittent helicity injection for field-reversed configurations control: shear-driven tilt suppression and ion heating.
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            NameFull: Ahmadi, T.
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            NameFull: Ono, Y.
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            NameFull: Tanabe, H.
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            – D: 01
              M: 01
              Text: 2026
              Type: published
              Y: 2026
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              Value: 66
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          Titles:
            – TitleFull: Nuclear Fusion
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