MERCREDI 24 MARS 2010
14 heures
Salle Séminaire 5
Centre de Physique Théorique
Marseille-Luminy

Marcin W. Jakubowski

Title: Influence of the magnetic topology on transport in the plasma
boundary with resonant magnetic perturbation"

Abstract: The topic of stochastic boundary in fusion devices is
investigated in tokamaks, stellarators and reversed field pinches
experiments since many years. However, as recently ELMs have been
successfully eliminated in H-mode plasmas at the DIII-D tokamak by
application of small, edge resonant magnetic perturbations (RMPs), it
became widely investigated topic in tokamaks. It is well known from
experiments made on Tore Supra or TEXTOR that the ergodic boundary in
tokamaks creates complicated, three-dimensional and heterogeneous
topology, which has a strong influence on plasma transport there. In
recent years strong evidence for the stochastization of the plasma
boundary has been given also at DIII-D. Moreover, plasmas with
ITER-Similar Shape show strong evidence for the 3D topology of the
magnetic field lines in the plasma boundary, which consists of field
lines with very different connection lengths. Most obvious
manifestation of the perturbed plasma edge is the strike line
splitting observable in heat and particle flux. In H-mode plasmas
radial pressure profile at the plasma boundary is a strong function of
q95, what is in line with TEXTOR findings.