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We consider a 1 1/2degrees of freedom Hamiltonian dynamical system, whichmodels the chaotic dynamics of charged test-particles in a turbulent electricfield, across the confining magnetic field in controlled thermonuclear fusiondevices. The external electric field E = \nabla\bigvee is modeled by aphenomenological potential V and the magnetic field B is considered uniform. Itis shown that, by introducing a small additive control term to the externalelectric field, it is possible to create a transport barrier for this dynamicalsystem. The robustness of this control method is also investigated. Thistheoretical study indicates that alternative transport barriers can betriggered without requiring a control action on the device scale as in presentInternal Transport Barriers (ITB).

Barriers for the reduction of transport due to the EXB drift in magnetized plasmas