Abstract
Several parametric scans have been performed to study
momentum transport on JET. NBI modulation technique has
been applied to separating the diffusive and convective
momentum transport terms. The magnitude of the inward
momentum pinch depends strongly on the inverse density
gradient length, with an experimental scaling for the
pinch number being $-Rv_{pinch}/\chi\phi = 1.2R/L_n +
1.4$. There is no dependence of the pinch number on
collisionality. The Prandtl number was not found to
depend either on R/Ln, collisionality or on q. The
gyrokinetic simulations show qualitatively similar
dependence of the pinch number on R/Ln, but the
dependence is weaker in the simulations. Gyro-kinetic
simulations do not find any clear parametric dependence
in the Prandtl number, in agreement with experiments, but
the experimental values are larger than the simulated
ones. The extrapolation of these results to ITER
illustrates that at R/Ln>2 the pinch number becomes large
enough (> 3-4) to make the rotation profile peaked
provided that the edge rotation is non-zero. And this
rotation peaking can be achieved with small or even with
no core torque source. The absolute value of the core
rotation is still very challenging to predict partly due
to the lack of the present knowledge of the rotation at
the plasma edge, partly due to insufficient understanding
of 3D effects like braking and partly due to the
uncertainties in the extrapolation of the present
momentum transport results to a larger device.
Original language | English |
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Title of host publication | Proceedings |
Subtitle of host publication | 38th EPS Conference on Plasma Physics, EPS 2011 |
Editors | A. Becoulet |
Publisher | European Physical Society |
Pages | 605-608 |
Volume | 1 |
ISBN (Print) | 2-914771-68-1, 978-1-6183-9593-1 |
Publication status | Published - 2011 |
MoE publication type | A4 Article in a conference publication |
Event | 38th EPS Conference on Plasma Physics - Strasbourg, France Duration: 27 Jun 2011 → 1 Jul 2011 |
Conference
Conference | 38th EPS Conference on Plasma Physics |
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Abbreviated title | EPS 2011 |
Country/Territory | France |
City | Strasbourg |
Period | 27/06/11 → 1/07/11 |
Keywords
- plasma physics