Viscous Coupling of Momentum from a Magnetized to an Unmagnetized Plasma

POSTER

Abstract

In order to drive rotation in the Plasma Couette Experiment (PCX), we must understand how momentum couples from the magnetized edge into the unmagnetized core. PCX uses rings of alternating-polarity permanent magnets to provide edge confinement, resulting in a well-contained, cylindrical and unmagnetized plasma. The rotation is driven at the edge with a J$\times$B torque, and viscous coupling is then required to achieve rotation in the bulk plasma. The plasma viscosity has not been well-measured in previous experiments, but PCX provides an excellent setup for its measurement. I will discuss progress towards explaining and optimizing the PCX velocity profile. This problem involves an anisotropic viscosity tensor, neutral drag, and strong gradients in the magnetic field.

Authors

  • Noam Katz

    University of Wisconsin - Madison, University of Wisconsin, Madison, University of Wisconsin-Madison, U. of Wisconsin

  • Cami Collins

    University of Wisconsin - Madison, University of Wisconsin, Madison, U. of Wisconsin

  • Ivan Khalzov

    University of Wisconsin-Madison, University of Wisconsin, Madison

  • Ben Brown

    University of Wisconsin-Madison, University of Wisconsin - Madison, University of Wisconsin, Madison

  • C.B. Forest

    University of Wisconsin - Madison, University of Wisconsin-Madison, University of Wisconsin, Department of Physics, University of Wisconsin - Madison, University of Wisconsin, Madison, U. of Wisconsin