Abstract
Time-resolved measurements of temperatures, density, and other parameters which describe the plasma at the X-type neutral point of the double inverse pinch laboratory discharge device are reported. Turbulent resistivity develops in this experiment without the usual application of an external electric field. The electric field is generated by field line reconnection or magnetic flux transfer. Various conductivity mechanisms are examined including binary collisions, space charge current limitation (Alfv́en-Carlqvist instability), and other current driven instabilities. The evidence suggests that the ion-acoustic instability is responsible for the observed current cutoff and turbulent conductivity. However, this instability must be driven well above its normal threshold. The competing effects of electron runaway and wave-particle interactions are discussed.
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