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L‐H Transport Barrier Formation: Monte Carlo Simulation of the Sheared E × B Flow Dynamics in Tokamaks
Author(s) -
Heikkinen J.A.,
Kiviniemi T.P.,
Peeters A.G.
Publication year - 2000
Publication title -
contributions to plasma physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.531
H-Index - 47
eISSN - 1521-3986
pISSN - 0863-1042
DOI - 10.1002/1521-3986(200006)40:3/4<431::aid-ctpp431>3.0.co;2-9
Subject(s) - tokamak , physics , monte carlo method , asdex upgrade , mechanics , plasma , bifurcation , electric field , orbit (dynamics) , bootstrap current , atomic physics , computational physics , nuclear physics , nonlinear system , aerospace engineering , statistics , mathematics , quantum mechanics , engineering
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 E r in contrast with earlier orbit loss models, but bifurcation and a solitary E r 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.