Magneto-Fluid Dynamics Seminar

Finite Larmor Radius effects at the H-mode pedestal and their implication of the force free MHD equilibrium

Speaker: Wei-li Lee, Princeton Plasma Physics Laboratory

Location: Warren Weaver Hall 905

Date: Tuesday, December 3, 2019, 11 a.m.


It has been shown that the radial electric field, Er, observed in the H-mode experiments can be explained by the charge separation between the electrons and the ion arising from the difference in their finite Larmor radii in the presence of sharp pressure gradients [1,2].  Here, we will explore the physics associated with the poloidal current produced by the resulting Er, again, due to the finite Larmor radius effects. Specifically, we will show that this poloidal current may be viewed as the  gyroviscosity, that can balance the diamagnetic current, and, consequently, makes the H-mode as a force-free configuration [3].  
[1] W. W. Lee and R. B. White, Phys. Plasmas 24, 081204 (2017)
[2] W. W. Lee and R. B. White, Phys. Plasmas 25, 054702 (2018)
[3] W. W. Lee and R. B. White, Phys. Plasmas 26, 040701 (2019)