Observations of core toroidal rotation reversals in Alcator C-Mod ohmic L-mode plasmas
書誌事項
- 公開日
- 2011-06-29
- 権利情報
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- https://iopscience.iop.org/page/copyright
- https://iopscience.iop.org/info/page/text-and-data-mining
- DOI
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- 10.1088/0029-5515/51/8/083005
- 公開者
- IOP Publishing
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説明
<jats:p>Direction reversals of intrinsic toroidal rotation have been observed in Alcator C-Mod ohmic L-mode plasmas following modest electron density or toroidal magnetic field ramps. The reversal process occurs in the plasma interior, inside of the <jats:italic>q</jats:italic> = 3/2 surface. For low density plasmas, the rotation is in the co-current direction, and can reverse to the counter-current direction following an increase in the electron density above a certain threshold. Reversals from the co- to counter-current direction are correlated with a sharp decrease in density fluctuations with <jats:italic>k</jats:italic> <jats:sub> <jats:italic>R</jats:italic> </jats:sub> ⩾ 2 cm<jats:sup>−1</jats:sup> and with frequencies above 70 kHz. The density at which the rotation reverses increases linearly with plasma current, and decreases with increasing magnetic field. There is a strong correlation between the reversal density and the density at which the global ohmic L-mode energy confinement changes from the linear to the saturated regime.</jats:p>
収録刊行物
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- Nuclear Fusion
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Nuclear Fusion 51 (8), 083005-, 2011-06-29
IOP Publishing