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8–13 Oct 2012
US/Pacific timezone

EX/P3-08: Magnetic Fluctuation-Driven Intrinsic Flow in a Toroidal Plasma

10 Oct 2012, 08:30
4h
Poster Room (Area F-B)

Poster Room (Area F-B)

Poster EXC - Magnetic Confinement Experiments: Confinement Poster: P3

Speaker

Mr Weixing Ding (UCLA)

Description

Magnetic fluctuations have been long observed in various magnetic confinement configurations. These perturbations may arise naturally from plasma instabilities such as tearing modes and energetic particle driven modes, but they can also be externally imposed by error fields or external magnetic coils. It is commonly observed that large MHD modes lead to plasma locking (no rotation) due to torque produced by eddy currents on the wall , and it is predicted that stochastic field induces flow damping where the radial electric field is reduced . Flow generation is of great importance to fusion plasma research, especially low-torque devices like ITER, as it can act to improve performance. Here we describe new measurements in the MST reversed field pinch (RFP) showing that the coherent interaction of magnetic and particle density fluctuations can produce a turbulent fluctuation-induced kinetic force that acts to drive spontaneous plasma rotation. Key observations include; (1) the average kinetic force, ~ 0.5 N/m3, is comparable to the intrinsic flow acceleration, , and (2) between sawtooth crashes, the spatial distribution of the kinetic force is directed to create a sheared parallel flow profile that is consistent with the measured flow profile, suggesting the kinetic force could be responsible for intrinsic plasma rotation.

Country or International Organization of Primary Author

USA

Primary author

Mr Weixing Ding (UCLA)

Co-authors

Dr A.F. Almagri (University of Wisconsin, Madison) Dr D.J. Den Hartog (University of Wisconsin, Madison) Dr D.L. Brower (UCLA) Dr G. Fiksel (University of Rochester) Prof. J.S. Sarff (University of Wisconsin, Madison) Dr L Lin (UCLA)

Presentation materials

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