Ecole Polytechnique Fédérale de Lausanne EPFL,

The study of electron heat transport dependence on controllable plasma parameters is strongly motivated by the needs to predict the plasma energy confinement in future magnetic confine-ment devices and improve it towards the conditions required for plasma ignition. This paper investigates the role of plasma shape- focusing on plasma triangularity- and plasma collision-ality on the local electron heat transport properties of L-mode plasmas. Global confinement studies in Ohmic [1, 2] and in centrally EC heated L-mode plasmas [3, 4] showed indeed the beneficial role of low or negative triangularity on the electron energy confinement time. More-over, plasma collisionality has been shown recently to play an essential role in particle transport through the stabilization of the trapped electron mode (TEM) at high collisionality [5, 6] and is expected to also influence electron heat transport. The present experiments are performed in moderately elongated L-mode plasmas, κ = 1.6, in limiter configuration. The plasma triangularity is varied from negative to positive values, −0.4 < δ < 0.4, using the unique shaping capabilities of the TCV tokamak (R0 = 0.88m, a = 0.25m). We define the normalized radius as the square root of the normalized plasma volume: ρ