21st Fusion Energy Conference, 13-21 de Outubro, Chengdu, China

	On the link between edge momentum redistribution and turbulence in the TJ-II stellarator
	Hidalgo, C., J.A. Alonso, P. Carvalho, A.A. Chmyga, J.L. de Pablos, L. Eliseev, T. Estrada, B. Gonçalves, S.M. Khrebtov, A.D. Komarov, A.S. Kozachok, L. Krupnik, A.V. Melnikov, R. Orozco, M.A. Pedrosa, S.V. Perfilov, E. Sánchez, C. Silva, M. Spolaore, S. Zweben, e a Equipa TJ-II
	Resumo
	The link between edge sheared flows and turbulence is investigated in the plasma edge region of the TJ-II stellarator. In the TJ-II stellarator there is a threshold density to trigger the development of edge shear flows. During sheared flow development the degree of turbulence anisotropy is modified. The fact that different quadratic terms in fluctuating velocities (radial-paralle l/radial-poloidal) change during edge sheared flow generation means that shear flow physics involves 3-D physics phenomena in which both perpendicular and parallel dynamics are involved. A new strategy has been recently applied to plasma physics to quantify the local energy transfer between flows and turbulence by computing the production term. Experimental results show that turbulence can act as an energy sink and energy source for the mean flow near the shear layer. Measurements of the turbulence production show the importance of 3-D effects on the energy transfer between flows and turbulence.