Electron temperature gradient turbulence

The first toroidal, gyrokinetic, electromagnetic simulations of small scale plasma turbulence are presented. The turbulence considered is driven by gr adients in the electron temperature. It is found that electron temperature gradient (ETG) turbulence can induce experimentally relevant thermal losses in magnetic confinement fusion devices. For typical tokamak parameters, th e transport is essentially electrostatic in character. The simulation resul ts are qualitatively consistent with a model that balances linear and secon dary mode growth rates. Significant streamer-dominated transport at long wa velengths occurs because the secondary modes that produce saturation become weak in the ETG limit.