Formation mechanism of toroidal rotation profile and characteristics of momentum transport in JT-60U

The diffusive term (the toroidal momentum diffusivity, ) and the non-diffusive term (the convection velocity, Vconv) of the momentum transport and the intrinsic rotation have been evaluated separately using the original transient momentum transport analysis. Thanks to the separation, characteristics of these terms are found for the first time as follows. (i) The characteristics of the momentum transport coefficients in the H-mode plasmas are obtained by plasma parameter scan such as plasma current (Ip), neutral beam (NB) heating power and electron density. The increases with increasing the heat diffusivity ( i) over a wide range of radii and / i ~0.7-3 at the middle of plasma r/a=0.5. (ii) The ratio of / i increases with increasing the ion temperature (Ti). (iii) the inward convection velocity (-Vconv) increases with increasing , and Vconv/ ~ -2.0 -0.7 (1/m) at r/a=0.5. (iv) We have also found that the intrinsic rotation with NBI, which is not explained with , Vconv and the external momentum input, increases with increasing ion pressure gradient (gradPi) and its direction is always antiparallel to Ip, i.e. the counter (CTR) direction. This dependence is almost the same, even the direction of the toroidal rotation velocity (Vt) and the confinement are different (Ip, L-mode, H-mode, CO-, BAL-, CTR-rotating plasmas). (v) We investigate the role of electron cyclotron heating on the Vt profile in the H-mode plasmas with low torque input using a fundamental O-mode electron cyclotron range of frequency wave (ECRF). It is supposed that the change in Vt with ECRF is due to the change in the momentum transport, the intrinsic rotation by gradPi and by ECRF itself. We separately estimate these terms, and found that ECRF drives the CO-intrinsic rotation inside the EC deposition and drives the CTR-intrinsic rotation outside the EC deposition. The CTR-rotation starts from the EC deposition location and the phase delay of the CTR-rotation is observed in the radial direction. This phase delay is comparable to , which is obtained in the similar plasma condition.