Simulations of collisional Trapped-Electron-Mode turbulence with the global gyrokinetic δf Particle-in-Cell code ORB5

Details Simulations of collisional Trapped-Electron-Mode turbulence with the global gyrokinetic δf Particle-in-Cell code ORB5 Simulations of collisional Trapped-Electron-Mode turbulence with the global gyrokinetic δf Particle-in-Cell code ORB5

Mar 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aps..apr.k1005v&link_type=abstract

American Physical Society, APS April Meeting 2012, March 31-Apr 3, 2012, abstract #K1.005

Physics

Scientific paper

Global collisional gyrokinetic simulations of Trapped-Electron-Mode (TEM) instabilities, for which the drive is the electron temperature gradient, are presented. The numerical tool is the Particle-In-Cell code ORB5, upgraded with linearized electron collision operators. Electrons are treated according to the so-called hybrid model, considering kinetic trapped electrons and adiabatic passing electrons. The linear TEM growth rates are found to be damped by electron collisions. The effect of the ratio Te/Ti on the collisional damping is studied. The accuracy of the Lorentz model is tested against the full linearized operator predictions. The issue of *circ; effects in TEM simulations is addressed. A critical electron temperature gradient for linear TEM instabilities is established and compared to the temperature gradient dependence of the turbulence level in non-linear global simulations. Finally, the effects of the zonal flow shearing rate on TEM turbulence are investigated in both collisionless and collisional global ORB5 simulations.

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