Observation of Spontaneous Toroidal Rotation Inversion in Ohmically Heated Tokamak Plasmas

Bulk plasma toroidal rotation is observed to invert spontaneously from counter to cocurrent direction in TCV (Tokamak à Configuration Variable) Ohmically heated discharges, in low confinement mode, without momentum input. The inversion occurs in high current discharges, when the plasma electron density exceeds a well-defined threshold. The transition between the two rotational regimes has been studied by means of density ramps. The results provide evidence of a change of the balance of nondiffusive momentum fluxes in the core of a plasma without an external drive.


Published in:
Physical Review Letters, 97, 235003
Year:
2006
Publisher:
American Physical Society
ISSN:
0031-9007
Keywords:
Laboratories:
SPC
CRPP




 Record created 2009-03-26, last modified 2018-12-03

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