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).