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Measurement of the Taylor Scale in a Magnetized Turbulent Laboratory Plasma Wind-Tunnel

Authors: Carlos Adan Cartagena-Sanchez, Joshua M. Carlson, David Schaffner

Source: Physics of Plasmas, Volume: 29, Issue: 3, Article Number: 032305, DOI: 10.1063/5.0073207, 2022

Type of Publication: Article

Abstract: The fluid Taylor scale is measured in the ½ñÈÕ³Ô¹Ï Experiment (BMX) of the ½ñÈÕ³Ô¹Ï Plasma Laboratory and examined as a potential dissipation scale of magnetic turbulence within the plasma. We present the first laboratory measurements of the Taylor scale of a turbulent magnetized plasma through multi-point correlations of broadband magnetic fluctuations. From spatial and temporal correlations, respectively, the measured Taylor scales are 2±12±1 and 3±1 cm3±1 cm. These measurements are on the same order of magnitude as estimated ion dissipation scales within the BMX plasma with ion inertial scales between 1 and 10 cm1 and 10 cm and ion gyroscales between 0.1 and 1.0 cm0.1 and 1.0 cm. From these measurements, a magnetic Reynolds number can be computed. Since Taylor scale values are determined using multi-point correlations and a Richardson extrapolation technique, an estimate of the magnetic Reynolds number can be found without the added complication of specifying a model of microscopic diffusivity, a parameter often difficult to obtain experimentally.

Carlos Adan Cartagena-Sanchez is a Ph.D. candidate and Joshua M. Carlson is a master's candidate in the Physics Department at the Graduate School of Arts and Sciences.