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  4. Non-diffusive suprathermal ion transport associated with blobs in TORPEX plasmas
 
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Non-diffusive suprathermal ion transport associated with blobs in TORPEX plasmas

Bovet, Alexandre Dominique
•
Avino, Fabio  
•
Fasoli, Ambrogio
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2014
56th Annual Meeting of the APS Division of Plasma Physics Volume 59, Number 15

We present unprecedented space and time-resolved measurements of the transport of a suprathermal ion beam injected in the toroidal device TORPEX. Experiments are performed in turbulence dominated by an ideal-interchange mode using a Li6+ ion source and a set of energy analyzers. Depending on the suprathermal ion energy, the transport exhibits subdiffusive or superdiffusive behaviors. The fast ion current fluctuations are quasi-Gaussian in the former regime and strongly intermittent in the latter. In the superdiffusive case, using conditional sampling, we show that the transport is associated with intermittent field-aligned blobs. In the subdiffusive case, supra-thermal ions average the turbulent structures during their gyro-motion and their vertical drift. These results complement our investigations of the supra-thermal ion transport using 3D time-averaged measurements, which are in agreement with numerical simulations. Numerical modeling is performed by computing the trajectories of tracers in a turbulent electrostatic field generated by a 2D global fluid model. Gyro- and drift-averaging reduce the transport. The evolution of the radial distribution of fast ions can be modeled by a fractional diffusion equation describing fractional Lévy motion.

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Type
conference presentation
Author(s)
Bovet, Alexandre Dominique
•
Avino, Fabio  
•
Fasoli, Ambrogio
•
Furno, Ivo
•
Gustafson, Kyle
•
Ricci, Paolo  
Date Issued

2014

URL

URL

http://meeting.aps.org/Meeting/DPP14/Session/GO7.6
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OTHER

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Event nameEvent placeEvent date
56th Annual Meeting of the APS Division of Plasma Physics Volume 59, Number 15

New Orleans, Louisiana, USA

October 27–31, 2014

Available on Infoscience
December 8, 2014
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/109277
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