On the mutual effect of ion temperature gradient instabilities and   impurity peaking in the reversed field pinch
  The presence of impurities is considered in gyrokinetic calculations of ion temperature gradient (ITG) instabilities and turbulence in the reversed field pinch device RFX-mod. This device usually exhibits hollow Carbon/Oxygen profiles, peaked in the outer core region. We describe the role of the impurities in ITG mode destabilization, and analyze whether ITG turbulence is compatible with their experimental gradients. 
I. Predebon, L. Carraro, C. Angioni
physics.plasm-ph