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Spatio-temporal evolutions of ion heat flux and radial electric field during internal transport barrier formation on JT-60U.

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Title: Spatio-temporal evolutions of ion heat flux and radial electric field during internal transport barrier formation on JT-60U.
Authors: Kin, F (AUTHOR) kin.fumiyoshi@qst.go.jp, Itoh, K (AUTHOR), Yoshida, M (AUTHOR), Honda, M (AUTHOR), Kamada, Y (AUTHOR), Kamiya, K (AUTHOR), Narita, E (AUTHOR), Bando, T (AUTHOR)
Source: Plasma Physics & Controlled Fusion. Mar2021, Vol. 63 Issue 3, p1-9. 9p.
Subjects: Electric flux, Heat flux, Electric fields, Shear flow, Ionic structure
Abstract: Spatio-temporal structures of ion heat flux and radial electric field are investigated on JT-60U to understand a mechanism of the internal transport barrier (ITB) formation. Contrary to the conventional argument that the ITB formation is due to the flow shear suppressions on turbulence, we observe that the shearing rate during the ITB formation is not enough for turbulence suppressions with ∼ 1. Another finding is that the ITB is formed simultaneously with abrupt decreases of ion heat flux in the global region (like the report in Neudatchine et al 1999 Plasma Phys. Control. Fusion 41 L39), and the gradient–flux relations are non-diffusively developed step by step. These observations suggest the importance of the change in the long-radial fluctuations, which is previously observed in JT-60U (Nazikian et al 2005 Phys. Rev. Lett. 94 135002). Therefore, the model of effects by non-uniformity of the radial electric field, under the condition where the scale separation is violated, is employed to explain such fluctuation quenching. Consistent results are obtained showing that the non-uniformity of the radial electric field effectively works on the fluctuations with long-radial wavelength and increases the temperature gradient. It seems natural that the suppression of the long-radial fluctuations drives the global transport improvement to form the ITB. [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: 149416815
AccessLevel: 6
PubType: Academic Journal
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  Label: Title
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  Data: Spatio-temporal evolutions of ion heat flux and radial electric field during internal transport barrier formation on JT-60U.
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  Data: <searchLink fieldCode="AR" term="%22Kin%2C+F%22">Kin, F</searchLink> (AUTHOR)<i> kin.fumiyoshi@qst.go.jp</i><br /><searchLink fieldCode="AR" term="%22Itoh%2C+K%22">Itoh, K</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Yoshida%2C+M%22">Yoshida, M</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Honda%2C+M%22">Honda, M</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Kamada%2C+Y%22">Kamada, Y</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Kamiya%2C+K%22">Kamiya, K</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Narita%2C+E%22">Narita, E</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Bando%2C+T%22">Bando, T</searchLink> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Plasma+Physics+%26+Controlled+Fusion%22">Plasma Physics & Controlled Fusion</searchLink>. Mar2021, Vol. 63 Issue 3, p1-9. 9p.
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  Data: <searchLink fieldCode="DE" term="%22Electric+flux%22">Electric flux</searchLink><br /><searchLink fieldCode="DE" term="%22Heat+flux%22">Heat flux</searchLink><br /><searchLink fieldCode="DE" term="%22Electric+fields%22">Electric fields</searchLink><br /><searchLink fieldCode="DE" term="%22Shear+flow%22">Shear flow</searchLink><br /><searchLink fieldCode="DE" term="%22Ionic+structure%22">Ionic structure</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Spatio-temporal structures of ion heat flux and radial electric field are investigated on JT-60U to understand a mechanism of the internal transport barrier (ITB) formation. Contrary to the conventional argument that the ITB formation is due to the flow shear suppressions on turbulence, we observe that the shearing rate during the ITB formation is not enough for turbulence suppressions with ∼ 1. Another finding is that the ITB is formed simultaneously with abrupt decreases of ion heat flux in the global region (like the report in Neudatchine et al 1999 Plasma Phys. Control. Fusion 41 L39), and the gradient–flux relations are non-diffusively developed step by step. These observations suggest the importance of the change in the long-radial fluctuations, which is previously observed in JT-60U (Nazikian et al 2005 Phys. Rev. Lett. 94 135002). Therefore, the model of effects by non-uniformity of the radial electric field, under the condition where the scale separation is violated, is employed to explain such fluctuation quenching. Consistent results are obtained showing that the non-uniformity of the radial electric field effectively works on the fluctuations with long-radial wavelength and increases the temperature gradient. It seems natural that the suppression of the long-radial fluctuations drives the global transport improvement to form the ITB. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  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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              Text: Mar2021
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