Angioni, C., Candy, J., Fable, E., Maslov, M., Peeters, A. G., Waltz, R. E. and Weisen, H. (2009) Particle pinch and collisionality in gyrokinetic simulations of tokamak plasma turbulence. Physics of Plasmas, Vol.16 (No.6). Article no. 060702. doi:10.1063/1.3155498 ISSN 1070-664X.

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Abstract

The generic problem of how, in a turbulent plasma, the experimentally relevant conditions of a particle flux very close to the null are achieved, despite the presence of strong heat fluxes, is addressed. Nonlinear gyrokinetic simulations of plasma turbulence in tokamaks reveal a complex dependence of the particle flux as a function of the turbulent spatial scale and of the velocity space as collisionality is increased. At experimental values of collisionality, the particle flux is found close to the null, in agreement with the experiment, due to the balance between inward and outward contributions at small and large scales, respectively. These simulations provide full theoretical support to the prediction of a peaked density profile in a future nuclear fusion reactor.

Item Type:	Journal Article
Subjects:	Q Science > QC Physics
Divisions:	Faculty of Science, Engineering and Medicine > Science > Physics
Journal or Publication Title:	Physics of Plasmas
Publisher:	American Institute of Physics
ISSN:	1070-664X
Official Date:	June 2009
Dates:	Date Event June 2009 Published
Volume:	Vol.16
Number:	No.6
Number of Pages:	4
Page Range:	Article no. 060702
DOI:	10.1063/1.3155498
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access

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