Scaling of spontaneous rotation with temperature and plasma current in tokamaks

Using theoretical arguments, a simple scaling law for the size of the intrinsic rotation observed in tokamaks in the absence of momentum injection is found: the velocity generated in the core of a tokamak must be proportional to the ion temperature difference in the core divided by the plasma curren...

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Bibliographic Details
Published in:arXiv.org 2012-03
Main Authors: Parra, F I, Nave, M F F, Schekochihin, A A, Giroud, C, de Grassie, J S, Severo, J H F, de Vries, P, K -D Zastrow, Contributors, JET-EFDA
Format: Article
Language:English
Subjects:
Ion temperature
Plasma currents
Rotating plasmas
Rotation
Scaling laws
Temperature gradients
Tokamak devices
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Summary:Using theoretical arguments, a simple scaling law for the size of the intrinsic rotation observed in tokamaks in the absence of momentum injection is found: the velocity generated in the core of a tokamak must be proportional to the ion temperature difference in the core divided by the plasma current, independent of the size of the device. The constant of proportionality is of the order of \(10\,\mathrm{km \cdot s^{-1} \cdot MA \cdot keV^{-1}}\). When the intrinsic rotation profile is hollow, i.e. it is counter-current in the core of the tokamak and co-current in the edge, the scaling law presented in this Letter fits the data remarkably well for several tokamaks of vastly different size and heated by different mechanisms.
ISSN:2331-8422
DOI:10.48550/arxiv.1108.6106