Integrated predictive modeling simulations of the Mega-Amp Spherical Tokamak (original) (raw)

Integrated predictive modeling simulations are carried out using the BALDUR transport code ͓Singer et al., Comput. Phys. Commun. 49, 275 ͑1982͔͒ for high confinement mode ͑H-mode͒ and low confinement mode ͑L-mode͒ discharges in the Mega-Amp Spherical Tokamak ͑MAST͒ ͓Sykes et al., Phys. Plasmas 8, 2101 ͑2001͔͒. Simulation results, obtained using either the Multi-Mode transport model ͑MMM95͒ or, alternatively, the mixed-Bohm/gyro-Bohm transport model, are compared with experimental data. In addition to the anomalous transport, neoclassical transport is included in the simulations and the ion thermal diffusivity in the inner third of the plasma is found to be predominantly neoclassical. The sawtooth oscillations in the simulations radially spread the neutral beam injection heating profiles across a broad sawtooth mixing region. The broad sawtooth oscillations also flatten the central temperature and electron density profiles. Simulation results for the electron temperature and density profiles are compared with experimental data to test the applicability of these models and the BALDUR integrated modeling code in the limit of low aspect ratio toroidal plasmas.

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