The parameters of an avalanche generated by an electron in helium at different ratios E/p , where E is the external field strength and p is the pressure, are simulated. The E/p dependences of the ionization rate and Townsend coefficient have maxima at E/p ≈1000 and ≈200 V/(cm Torr), respectively. The today’s concepts of the electron density distribution in the avalanche are valid only at small values of the reduced strength, E/p <100 V/(cm Torr). With E/p >100 V/(cm Torr), the electron density distribution extends along the field.
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Ткачев et al. (2004) studied this question.
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