Abstract
A category of oscillation identified with the inhomogeneous energy-density driven instability has been experimentally verified. This mode exploits the free energy available from shear in the [bold E][times][bold B] flow velocity. This shear is produced experimentally by applying different voltages to a segmented disk electrode located on axis at the end of a [ital Q] machine plasma column. As plasma conditions are varied between the two parameter regimes that, according to theory, correspond to the current-driven and shear-driven waves, the expected transition in mode characteristics is observed.
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