Advanced toroidal theory

At high collisionality the neoclassical theory of transport in tokamaks predicts that the electron confinement time τe will exceed the ion confinement time τi by a factor roughly equal to the square root of the mass ratio mi/me. If the energy confinement time τE is calculated from the normalized particle confinement time τ through division by an emperical factor of three times the magnetic field strength B, then the theoretical confinement time of the ions exceeds experimental measurements by a factor of as much as three. The prediction that the electron confinement time will be two orders of magnitude larger is referred to as anomalous electron transport. We assert that the anomaly can be explained by imposing a strict requirement of quasineutrality to determine the electric potential instead of allowing it to be found from conservation of momentum. Numerical evidence for this contention is provided by performing Monte Carlo calculations based on a fast new computer code called TRAN