Nonlinear MHD and 3D Magnetic Field Effects in Tokamaks
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Principal Investigator-C.C.Hegna
Department of Engineering Physics
University of Wisconsin-Madison
The proposed research in plasma theory addresses key issues in the areas of nonlinear extended MHD and 3D tokamak physics.The emphasis is on:the introduction of collisional kinetic effects in extended MHD codes,developing analytic descriptions of how disruptive neoclassical tearing modes(NTMs)are seeded in DIII-D,and understanding the properties of the pedestal region in the presence of externally applied 3D magnetic fields.The specific areas of proposed research include:
1))ion kinetic closure calculations in extended MHD simulation,
2)MHD-transient-induced seeding of disruptive NTMs in tokamak plasmas,
3)local stability and gyrokinetic modeling of 3D edge pedestals.
In the area of ion kinetic closure physics,we propose to compute neoclassical viscosity for tokamak applications using five-dimensional drift kinetic solutions that are directly coupled to NIMROD’s fluid evolution.This work is to be applied to field error penetration problems incorporating the effects of neoclassical flowing damping in tokamaks.In the area of NTM modeling,we propose to continue the development of analytic model descriptions for MHD-transient-induced seeding of robust NTM growth in tokamak plasmas in collaboration with experimentalists on DIII-D.The goal is develop reduced models for sensing the seeding and initial growth of m/n=2/1 NTMs in ITER baseline scenarios.The 3D pedestal work is focusing on the impact of applied 3D fields on the micro-instability and turbulent transport properties of tokamak pedestals in the presence of applied 3D magnetic perturbation.This work is to be carried out as a combination of analytic theory and gyrokinetic simulation.