Enhancement on the charge collection property of the 3D positive ion detector

This study focuses on enhancing the charge collection efficiency of 3D positive ion detector, which plays a vital role in radiation biology, dosimetry, protection, and measurement. Conventionally, highly resistive glass and fluorine doped tin oxide/gold-coated ceramic glass cathodes have been employed, yielding charge collections in the picocoulomb (pC) to nanocoulomb (nC) range. However, the introduction of metal oxide/metal-coated cathodes has significantly improved charge collection, increasing electron counts from 10⁸ to 10¹⁰. Building upon this progress, our research explores the use of oxygen-free high conductivity (OFHC) copper cathode, resulting in a substantial enhancement of charge collection to the microcoulomb (μC) range and electron counts reaching 10¹³. This study also examines the relationship between electron mobility, drift velocity, and charge collection under varying pressure conditions. The results reveal a linear increase in electron mobility with pressure, while drift velocity remains stable, dominated by the applied electric field. The stability of drift velocity and consistent charge collection performance across pressure variations highlight the detector's reliability, offering valuable insights into electron transport behavior in particle detection systems.