Volume 119, Number 1, July 2017
|Number of page(s)||7|
|Section||Physics of Gases, Plasmas and Electric Discharges|
|Published online||18 September 2017|
Transport barriers associated to the resonant interaction between trapped particle modes triggered by plasma polarization injection
1 Institut Jean Lamour- UMR 7168, University of Lorraine - BP 239, F-54506 Vandoeuvre les Nancy, France
2 Max Planck Institute for Plasma Physics - D-85748 Garching, Germany
Received: 8 June 2017
Accepted: 25 August 2017
This letter explores the parametric excitation of low-frequency zonal flow induced by the beating of collisionless trapped ion and trapped electrons modes (CTIMs and CTEMs) and its feedback on the formation of transport barrier (TB). The zonal flow generation and the associated intermittent transport are investigated using a semi-Lagrangian gyrokinetic Vlasov simulations based on a Hamiltonian reduction technique, where both the fastest scales (cyclotron and bounce motions) are gyro-averaged. The model confirms the possibility to trigger TB by means of polarization effects, recently observed in global gyrokinetic simulations by Strugarek A. et al., Phys. Rev. Lett., 111 (2013) 145001.
PACS: 52.65.Tt – Gyrofluid and gyrokinetic simulations / 52.25.Dg – Plasma kinetic equations / 52.35.Ra – Plasma turbulence
© EPLA, 2017
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