ELECTRON-TRANSPORT FLUXES IN POTATO PLATEAU REGIME

Electron transport fluxes in the potato plateau regime are calculated from the solutions of the drift kinetic equation and fluid equations. It is found that the bootstrap current density remains finite in the r egion close to the magnetic axis, although it decreases with increasin g collision frequency. This finite amount of the bootstrap current in the relatively collisional regime is important in modelling tokamak st artup with 100% bootstrap current. (C) 1997 American Institute of Phys ics.