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Role of plasma elongation on turbulent transport in magnetically confined plasmas
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Angelino, P., Garbet, X., Villard, L., Bottino, A., Jolliet, S., Ghendrih, Ph., Grandgirard, V., McMillan, Ben F., Sarazin, Y., Dif-Pradalier, G. and Tran, T. (2009) Role of plasma elongation on turbulent transport in magnetically confined plasmas. Physical Review Letters, Vol.102 (No.19). Article: 195002. doi:10.1103/PhysRevLett.102.195002 ISSN 0031-9007.
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Official URL: http://dx.doi.org/10.1103/PhysRevLett.102.195002
Abstract
The theoretical study of plasma turbulence is of central importance to fusion research. Experimental evidence indicates that the confinement time results mainly from the turbulent transport of energy, the magnitude of which depends on the turbulent state resulting from nonlinear saturation mechanisms, in particular, the self-generation of coherent macroscopic structures and large scale flows. Plasma geometry has a strong impact on the structure and magnitude of these flows and also modifies the mode linear growth rates. Nonlinear global gyrokinetic simulations in realistic tokamak magnetohydrodynamic equilibria show how plasma shape can control the turbulent transport. Results are best described in terms of an effective temperature gradient. With increasing plasma elongation, the nonlinear critical effective gradient is not modified while the stiffness of transport is decreasing.
Item Type: | Journal Article | ||||
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Subjects: | Q Science > QC Physics | ||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
Journal or Publication Title: | Physical Review Letters | ||||
Publisher: | American Physical Society | ||||
ISSN: | 0031-9007 | ||||
Official Date: | 12 May 2009 | ||||
Dates: |
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Volume: | Vol.102 | ||||
Number: | No.19 | ||||
Page Range: | Article: 195002 | ||||
DOI: | 10.1103/PhysRevLett.102.195002 | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Access rights to Published version: | Restricted or Subscription Access |
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