Study of ion detection efficiency in Jet Counter nanodosimeter

Abstract This work reevaluates the ion detection efficiency of the Jet Counter nanodosimeter working with low-pressure nitrogen. SIMION simulations were used to model the trajectories of ions during their extraction from the interaction chamber. The study examined the relationship between efficiency vs. extraction voltage, gas density, and temperature. The highest detection efficiency (approximately 60%) was achieved at a high extraction voltage and low temperature. The findings were then used as a parameter in the Monte Carlo modeling of the Jet Counter operations, and the results were compared with experimental results, showing satisfactory agreement.