Transport and recombination of electrons in a high pressure proportional counter using different gas mixtures

Charge amplification and transport in a cylindrical proportional counter have been studied for a number of gas mixtures at high pressures, as a function of the distance of the primary interaction from the anode. We discuss various known theoretical gas gain formulae, the electron swarm characteristics and transport, and derive information on recombination rates as a function of gas pressure and reduced electric field using spectral analysis.