The authors describe hybrid magnetic trap of the stellarator type (Unitron) employing a helical winding with four poles arranged in a certain way with respect to the minor azimuth. Combination of the helical conductors and current provides qualitatively different magnetic traps with spatial and plane magnetic axes. Analytical expression are derived for the various characteristics of the main types of Unitron trap. A study of the parameters of the Unitron shows that the system with the second and third harmonics of the helical field has better confinement properties.

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