3D field phase-space control in tokamak plasmas

Control of magnetohydrodynamic stability by phase space engineering of energetic ions in tokamak plasmas.

Virtually collisionless magnetic mirror-trapped energetic ion populations often partially stabilize internally driven magnetohydrodynamic disturbances in the magnetosphere and in toroidal laboratory plasma devices such as the tokamak. This results in less frequent but dangerously enlarged plasma reorganization. Unique to the toroidal magnetic configuration are confined 'circulating' energetic p...

Drift-MHD model of error-field penetration in tokamak plasmas

Drift-magnetohydrodynamical model of error-field penetration in tokamak plasmas

A previously published magnetohydrodynamical MHD model of error-field penetration in tokamak plasmas is extended to take drift-MHD physics into account. In particular, diamagnetic and semicollisional effects are both fully incorporated into the analysis. The new model is used to examine the scaling of the penetration threshold in ohmic tokamak plasmas. © 2006 American Institute of Physics. DOI:...

Potential Turbulence in Tokamak Plasmas

Microscopic potential turbulence in tokamak plasmas are investigated by a multi-samplevolume heavy ion beam probe. The wavenumber/frequency spectra S(k,ω) of the plasmas potential fluctuation as well as density fluctuation are obtained for the first time. The instantaneous turbulence-driven particle flux, calculated from potential and density turbulence has oscillations of which amplitude is ab...

Transport equations in tokamak plasmas

Tokamak plasma transport equations are usually obtained by flux surface averaging the collisional Braginskii equations. However, tokamak plasmas are not in collisional regimes. Also, ad hoc terms are added for neoclassical effects on the parallel Ohm’s law, fluctuation-induced transport, heating, current-drive and flow sources and sinks, small magnetic field nonaxisymmetries, magnetic field tra...