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Turbulent transport in tokamak plasmas with rotational shear.

Abstract:

Nonlinear gyrokinetic simulations are conducted to investigate turbulent transport in tokamak plasmas with rotational shear. At sufficiently large flow shears, linear instabilities are suppressed, but transiently growing modes drive subcritical turbulence whose amplitude increases with flow shear. This leads to a local minimum in the heat flux, indicating an optimal E×B shear value for plasma confinement. Local maxima in the momentum fluxes are observed, implying the possibility of bifurcatio...

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Publication status:
Published

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Authors


Highcock, EG More by this author
Schekochihin, AA More by this author
Cowley, SC More by this author
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Journal:
Physical review letters
Volume:
106
Issue:
17
Pages:
175004
Publication date:
2011-04-05
DOI:
EISSN:
1079-7114
ISSN:
0031-9007
URN:
uuid:5796f551-5e53-4d91-bee8-6f07174b7c74
Source identifiers:
170308
Local pid:
pubs:170308
Language:
English
Keywords:

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