Investigation on the low pressure limit of the Bayard–Alpert gauge

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Abstract
To extend the pressure measurement capability of a Bayard–Alpert (BA) gauge, several commercial BA gauges are modified. To study the position dependence of filament on gauge sensitivity, hair-pin filaments instead of commercial helical filaments were used. The characteristics of the modified gauge, which included the variation of the gauge sensitivity on the applied voltage and the position of the filament, are reported. To monitor the normal and the reverse x-ray photocurrents, the gauge was inserted into a fixed size tube of 304 LN stainless steel. The validity of the self-modulation was confirmed. A sensitivity of 60 Torr−1 and an x-ray limit of 2.7×10−13 Torr (N2 equivalent) was obtained.

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