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Collisionality scaling of main-ion toroidal and poloidal rotation in low torque DIII-D plasmas.

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Title: Collisionality scaling of main-ion toroidal and poloidal rotation in low torque DIII-D plasmas.
Authors: Grierson, B. A.1 bgriers@pppl.gov, Burrell, K. H.2, Solomon, W. M.1, Budny, R. V.1, Candy, J.2
Source: Nuclear Fusion. 2013, Vol. 53 Issue 6, p1-9. 9p.
Subjects: Toroidal plasma, Collisions (Nuclear physics), Torque, Rotational motion, Tokamaks, Electric fields
Abstract: In tokamak plasmas with low levels of toroidal rotation, the radial electric field Er is a combination of pressure gradient and toroidal and poloidal rotation components, all having similar magnitudes. In order to assess the validity of neoclassical poloidal rotation theory for determining the poloidal rotation contribution to Er, Dα emission from neutral beam heated tokamak discharges in DIII-D (Luxon 2002 Nucl. Fusion 42 614) has been evaluated in a sequence of low torque (electron cyclotron resonance heating and balanced diagnostic neutral beam pulse) discharges to determine the local deuterium toroidal rotation velocity. By invoking the radial force balance relation the deuterium poloidal rotation can be inferred. It is found that the deuterium poloidal flow exceeds the neoclassical value in plasmas with collisionality v* < 0.1, being more ion diamagnetic, and with a stronger dependence on collisionality than neoclassical theory predicts. At low toroidal rotation, the poloidal rotation contribution to the radial electric field and its shear is significant. The effect of anomalous levels of poloidal rotation on the radial electric field and cross-field heat transport is investigated for ITER parameters. [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
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  Data: Collisionality scaling of main-ion toroidal and poloidal rotation in low torque DIII-D plasmas.
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  Data: &lt;searchLink fieldCode=&quot;JN&quot; term=&quot;%22Nuclear+Fusion%22&quot;&gt;Nuclear Fusion&lt;/searchLink&gt;. 2013, Vol. 53 Issue 6, p1-9. 9p.
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  Data: In tokamak plasmas with low levels of toroidal rotation, the radial electric field Er is a combination of pressure gradient and toroidal and poloidal rotation components, all having similar magnitudes. In order to assess the validity of neoclassical poloidal rotation theory for determining the poloidal rotation contribution to Er, Dα emission from neutral beam heated tokamak discharges in DIII-D (Luxon 2002 Nucl. Fusion 42 614) has been evaluated in a sequence of low torque (electron cyclotron resonance heating and balanced diagnostic neutral beam pulse) discharges to determine the local deuterium toroidal rotation velocity. By invoking the radial force balance relation the deuterium poloidal rotation can be inferred. It is found that the deuterium poloidal flow exceeds the neoclassical value in plasmas with collisionality v* &lt; 0.1, being more ion diamagnetic, and with a stronger dependence on collisionality than neoclassical theory predicts. At low toroidal rotation, the poloidal rotation contribution to the radial electric field and its shear is significant. The effect of anomalous levels of poloidal rotation on the radial electric field and cross-field heat transport is investigated for ITER parameters. [ABSTRACT FROM AUTHOR]
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  Data: &lt;i&gt;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&#39;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.&lt;/i&gt; (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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        Value: 10.1088/0029-5515/53/6/063010
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      – Code: eng
        Text: English
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      Pagination:
        PageCount: 9
        StartPage: 1
    Subjects:
      – SubjectFull: Toroidal plasma
        Type: general
      – SubjectFull: Collisions (Nuclear physics)
        Type: general
      – SubjectFull: Torque
        Type: general
      – SubjectFull: Rotational motion
        Type: general
      – SubjectFull: Tokamaks
        Type: general
      – SubjectFull: Electric fields
        Type: general
    Titles:
      – TitleFull: Collisionality scaling of main-ion toroidal and poloidal rotation in low torque DIII-D plasmas.
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            NameFull: Grierson, B. A.
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            NameFull: Burrell, K. H.
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            NameFull: Solomon, W. M.
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              M: 06
              Text: 2013
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              Y: 2013
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              Value: 53
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