Abstract
Theoretical investigation of electron drift velocities in noble gas-“moderator” gas mixtures under the influence of an electric field has yielded a new scaling law w= E p G(z) 1+αH(Z) where G and H are functions of the parameter z = α/( E/ p) 2 only. Here, w is the electron drift velocity, E the electric field strength, p the gas pressure and α the concentration of moderator gas. The conditions limiting the validity of this scaling law are discussed. Comparison of the law to existing experimental data (Ne, A, Kr, Xe with CO 2; A, Kr with CH 4) demonstrate the validity over a wide range. The functions G and H derived from these data are presented. The existing drift velocity data, having been condensed to this more manageable form, is applied to the computation of electron transit times in cylindrical proportional counters using any of these gas mixtures.
Published Version
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