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

Abstract. 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 scans 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/ ~ 0.5- 2 (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 th