The formation of a current layer of a Z discharge of Ar gas at low pressure was studied-It is known that a current layer is usually formed on the wall of the discharge tube and imploded to the tube axis with increasing magnetic pressure. But such a current layer is nott always formed on the wall of the discharge tube in a low pressure experiment.
The structure of the current layer at the formative phase was observed by an image converter camera.
The position and form of the current layer at the formative phase were affected by the pressure of the filling gas and the distribution of the electric field strength and also of the ionization coefficient.
When the discharge tube is covered by the return circuit and the gas pressure and electric field strength are changed, the forms of the current layer at the formative phase could be classified into three types, namely, shell, columnar and conic type.
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