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research article

Scrape-off-layer current loops and floating potential in limited tokamak plasmas

Loizu, J.
•
Morales, J. A.
•
Halpern, F. D.
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2017
Journal of Plasma Physics

We investigate the question of how plasma currents circulate and close in the scrape-off-layer (SOL) of convection-limited tokamak plasmas. A simplified two-fluid model describes how currents must evacuate charge at the sheaths due to cross-field currents that are not divergence-free. These include turbulence-driven polarization currents and poloidally asymmetric equilibrium diamagnetic currents. The theory provides an estimate for the radial profile of the floating potential, which reveals a dipolar structure like the one observed experimentally. Simulations with a fluid turbulence code provide evidence for the predicted behaviour of currents and floating potential.

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Type
research article
DOI
10.1017/S0022377817000927
Web of Science ID

WOS:000417674400011

Author(s)
Loizu, J.
Morales, J. A.
Halpern, F. D.
Ricci, P.
Paruta, P.
Date Issued

2017

Publisher

Cambridge University Press

Published in
Journal of Plasma Physics
Volume

83

Issue

6

Article Number

575830601

Subjects

CRPP_EDGE

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
SPC  
Available on Infoscience
January 9, 2018
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/143668
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