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Characteristics of microinstabilities in electron cyclotron and ohmic heated discharges

István Pusztai (Institutionen för teknisk fysik, Nukleär teknik) ; Sara Moradi (Institutionen för teknisk fysik, Nukleär teknik) ; Tünde Fülöp (Institutionen för teknisk fysik, Nukleär teknik) ; Natalia Timchenko
Physics of plasmas (1070-664X). Vol. 18 (2011), 8, p. 082506.
[Artikel, refereegranskad vetenskaplig]

Characteristics of microinstabilities in electron cyclotron (EC) and ohmic heated (OH) discharges in the T10 tokamak have been analyzed by linear electrostatic gyrokinetic simulations with gyro [J. Candy and R. E. Waltz, J. Comput. Phys. 186, 545 (2003)] aiming to find insights into the effect of auxiliary heating on the transport. Trapped electron modes are found to be unstable in both OH and the EC heated scenarios. In the OH case the main drive is from the density gradient and in the EC case from the electron temperature gradient. The growth rates and particle fluxes exhibit qualitatively different scaling with the electron-to-ion temperature ratios in the two cases. This is mainly due to the fact that the dominant drives and the collisionalities are different. The inward flow velocity of impurities and the impurity diffusion coefficient decreases when applying EC heating, which leads to lower impurity peaking, consistently with experimental observations.

Nyckelord: fusion plasma physics, tokamak, turbulent transport

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Denna post skapades 2011-08-20. Senast ändrad 2015-07-28.
CPL Pubid: 144636


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Institutioner (Chalmers)

Institutionen för teknisk fysik, Nukleär teknik (2006-2015)


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