Flows, turbulence, and transport in the Large Plasma Device

We report on measurements of spontaneous flows, turbulence, Reynold's stress and particle flux in the Large Plasma Device (LAPD) at UCLA. Measurements of perpendicular and parallel flow using a six-sided Mach probe reveal a shear-layer flow in the cathode edge region whose peak flow increases with magnetic field and broadly distributed far-edge perpendicular flows that scale inversely with magnetic field. ~The role of boundary effects and turbulent Reynolds stress in establishing the flow profile is investigated. Reynolds stress is measured with a seven tip vorticity probe; characteristics of the turbulence are measured using triple Langmuir probe. ~The connection among shear flow, turbulence and spatial correlation lengths is examined through cross-correlation techniques, which also serves to establish the relationship between these quantities and gradient driven instabilities such as drift-Alfven or Kelvin-Hemholtz. These results are especially useful for comparisons to ongoing fluid simulations using the BOUT and BOUT++ 3D Braginskii fluid codes.