Measurement of the ionisation and attachment coefficients in SF6and air mixtures

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Abstract
The Townsend first ionisation coefficient alpha /p20, the electron attachment coefficient eta /p20, the effective ionisation coefficient alpha /p20(=( alpha /p20)-( eta /p20)) and the secondary coefficient gammaTfor SF6and air mixtures have been measured by the steady-state Townsend method for 5120-1Torr-1(155-1Torr-1and the alpha /p20varies approximately linearly with k at E/p20=160 V cm-1Torr-1, but the linear relationship of alpha /p20with k tends to break down with decreasing E/p20. The results also show that the gammaTdecreases rapidly from about 10-3to the values of gammaTfor SF6with increasing k at fixed E/p20and the limiting E/p20, at which alpha /p20= eta /p20, rapidly increase with increasing k as those of the SF6and nitrogen mixture.