Monte Carlo ion simulation and semi‐analytical calculation of the neoclassical radial current balance in a tokamak plasma edge show no spontaneous bifurcation of radial electric field Er in contrast with earlier orbit loss models, but bifurcation and a solitary Er generation by electrode polarization are seen. Strong orbit loss shear is found for H‐mode threshold conditions in ASDEX Upgrade, indicating that orbit loss is the major source of the shear for L‐H transition.
|Journal||Contributions to Plasma Physics|
|Publication status||Published - 2000|
|MoE publication type||A1 Journal article-refereed|