Abstract
This paper presents the result of experimental testing of the methodology auto-oscillating mode probe, which is based on a previously developed mathematical model of the secondary emission instability of a plasma-surface contact. The method of auto-oscillating mode probe is designed to measure the plasma parameters of beam-plasma discharge (BPD) in the near-axial zone of a beam-plasma installation with a longitudinal magnetic field. A scheme had been developed for measuring the current and voltage of the probe using a low-inductance resistive voltage divider, the Rogowski coil with the current shunt, and current meter on the Hall effect. The ion current density in the near-axial zone of the SPR was determined.