[en] The investigation of the Pre-glow effect is driven with the aim of creating a short-pulsed multicharged ion source. Recent experimental investigations have revealed strong influence of seed electrons, i.e. initial plasma density, on the amplitude and duration of the Pre-glow peak. Present work, consisting of experiments and simulations, is dedicated to further investigation of the Pre-glow dependence on initial plasma density and electrons energy. Experimental investigation was performed at University of Jyvaskyla (JYFL) with the AECR type ECRIS operated with 14 GHz frequency. Helium was used for the study. An initial ionization degree of the gas was varied by changing the pulse duration and duty factor. Time-resolved ion currents of He⁺ and He²⁺ were recorded. Calculations were made by using a zero-dimensional model based on the balance equations for the particles confined in the magnetic trap. Results of simulation are compared with experimental Pre-glow peaks and discussed. Good agreement between experimental data and simulation encourages us to conduct a further study, aimed at optimizing the Pre-glow by tuning source parameters and initial plasma conditions. This poster gives the scheme of the experiment, presents briefly the zero-dimensional model of gas breakdown in a magnetic trap of an ECR ion source and presents some comparison between the model and experimental data