Article révisé par les pairs
Résumé : Free energy plays an important role in gyrokinetic theory, since it is known to be a nonlinear invariant. Its evolution equations are derived and analyzed for the case of ion temperature gradient driven turbulence, using the formalism adopted in the Gene code. In particular, the ion temperature gradient drive, the collisional dissipation as well as entropyelectrostatic energy transfer channels represented by linear curvature and parallel terms are analyzed in detail. © 2011 American Institute of Physics.