Role of Toroidal Rotation in ITB Formation in Tokamaks
T. Rafiq, E. Schuster, A. Pankin, J. Anderson
Division of Plasma Physics (DPP) Annual Meeting of the American Physical Society (APS)
Portland, OR, USA, November 5-9, 2018
A set of tokamak discharges with internal transport barriers (ITBs) are
studied using the TRANSP code in order to investigate the role of
toroidal rotation in triggering of ITBs. The toroidal momentum transport
is predicted using theory-based Multi-Mode and TGLF anomalous transport
models to compute the toroidal rotation profiles and the effects of
turbulence quenching as a result of associated sheared flows. The effect
of co- versus counter injected beams on the location and strength of
ITBs is studied. Results are presented for existing discharges in order
to illustrate the extent to which the Multi-Mode and TGLF models in
TRANSP code yield toroidal rotation profiles that are consistent with
experimental data. The comparison is quantified by calculating the RMS
deviations and Offsets. The self-consistent evolution of the equilibrium
is computed using the TEQ module. Neoclassical transport is calculated
using the Chang-Hinton model. NBI and ICRF heating and current drive
are obtained using the NUBEAM and TORIC modules.