Comparison of the results of measurements of electronic parameters of plasma using Langmuir probes with insulators of different sizes

The influence of the size of the Langmuir probe insulator on the results of measurements of the plasma potential, electric field, mean energy and electron concentration in a helium discharge supported by a hollow cathode is studied. The measurements were carried out with a moving probe with spatial resolution. It has been established that the influence differs for different plasma parameters and depends on the localization of the probe in the cathode-anode space.