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Particle Transport in a Stochastic Magnetic Field
 

Plasma particle transport in a stochastic magnetic field is a key process in many environments ranging from laboratory plasmas, where it can destroy confinement, to clusters of galaxies, where it determines heat transport. Particle transport associated with magnetic tearing has now been measured in the reversed field pinch laboratory plasma MST. Multiple tearing modes appear, causing the magnetic field to become stochastic. Advanced laser interferometry was used to measure the correlations between density fluctuations and magnetic field fluctuations to determine the radial particle flux. This fluctuation induced particle transport is sufficient to account for the observed particle flux, as shown in the figure below. The dashed line is the measured particle flux; the solid line is the flux computed from a theory of transport induced by fluctuations. The two agree quite well. Surprisingly, the flux is larger than expected for well-established test particle expectations, suggesting that a more complete theory is needed.

 

 

Particle Flux

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