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Author: Cheonho Bae
Requested Type: Pre-Selected Invited
Submitted: 2017-03-15 02:21:49

Co-authors: Jayhyun Kim, Laurent Terzolo, Minjun J Choi, TongRyeol Rhee, Hyun Seok Kim, Sang Gon Lee

Contact Info:
National Fusion Research Institute
169-148 Gwahak-ro
Yuseong, Daejeon   34133
South Korea

Abstract Text:
All the toroidal angular torque contributions of both deuterium fuel and carbon impurity in axisymmetric NBI-heated KSTAR tokamak plasmas are investigated in this work. To account for all the contributions in the toroidal torque balance, the convective torques are neoclassically calculated and the torques from the deuterium and impurity sources with their atomic effects kinetically-simulated by TRANSP code are also included in the analysis. Neoclassical Toroidal Viscosity(NTV) torques are calculated based on the collisionality-extended Braginskii's decomposition and its axisymmetric torques are calculated with the gyroviscous contribution in realistic Shafranov-shifted D-shaped flux surfaces with the first-order poloidal asymmetries considered, based on the extended neoclassical formalism in an earlier work [Bae et. el., Nucl. Fusion 53 (2013) 043011]. The results, analyzed with the upgraded version of the nonlinear GTROTA code[Bae et al., Comp. Phys. Communications 184 (2013) 2571-2587], show that the toroidal torque balance is mostly maintained by the competition between two largest contributions from V cross B and frictional torques. With all other torques being much smaller by an order of magnitude, they provide detailed balances to yield the observed rotation and predicted transport profiles in the investigated NBI-heated tokamak discharges. It is also shown that the rotation and transport of deuterium and carbon can be significantly different with their disparate collisionality throughout the radial range and their radial fluxes are oppositely-directed with the carbon impurities accumulating in the core, corresponding to our conventional knowledge.

Comments:
It is my wish that this abstract can be chosen for an oral talk and my another one for a poster so that they complement each other. But I'll be flexible if decided otherwise by your committee.