Abstract
The theory of the helical instability of the positive column has been generalized to include the case of a magnetic field with shear. The resultant stability criterion has been evaluated numerically. It predicts stabilization when the sense of the helical magnetic field opposes that of the helical density perturbation of the instability. This has been verified by an experiment in a hollow plasma column. The radial form of the density of the unperturbed plasma is required for the calculation and has been obtained by both theoretical and experimental methods.
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