Configurational Variations and Finite-Beta Effects on Neoclassical Viscosities and Flows in Stellarators

The impact of magnetic geometry on neoclassical flows and viscosities for the Helically Symmetric Experiment (HSX) is investigated using the PENTA code [1,2]. Specifically, two topics are investigated: (1) finite-beta effects and (2) configurational variations. The PENTA code is used to calculate flows in HSX with the vacuum magnetic geometry and with finite-beta magnetic surfaces from the VMEC equilibrium code. This is done for the standard quasi-helically symmetric configuration of HSX, a symmetry-breaking mirror configuration and a hill configuration. The impact of these changes in the magnetic geometry on neoclassical viscosities and flows in HSX will be discussed.\\[0pt] [1] D. A. Spong, Phys. Plasmas 12, 056114 (2005). \\[0pt] [2] D. A. Spong, Fusion Sci. Technology 50, 343 (2006).