Ratio of Transverse Diffusion Coefficient to Mobility of Electrons in High-Pressure Xenon

Abstract

We constructed a parallel plate drift chamber for measuring the ratio of the transverse diffusion coefficient Dt to the mobility µ of electrons multiplied by the elementary charge e, eDt/µ, which is called the transverse characteristic energy, in high-pressure xenon gas. The characteristic energies of electrons in Xe were obtained at a high pressure of 1.0 MPa and the reduced electric field, E/N, from 0.77 to 7.7 ×10-18 V·cm2, where E denotes an electric field and N the number density of Xe atoms. At the same E/N, our results agreed well with the data at pressures from 107 to 193 kPa previously obtained by Koizumi et al. [J. Phys. B 19 (1986) 2331]. The characteristic energies of electrons in Xe were found to be constant as a function of E/N from a low pressure to 1.0 MPa.