Abstract
Four commercial nude-type Bayard–Alpert gauges were calibrated in four envelopes of different inner diameters, 35, 38, 54 and 70 mm, for nitrogen using a spinning rotor gauge as a reference. In high vacuum, 10 -4 Pa, three gauges in small envelopes of diameters 35 and 38 mm showed sensitivity coefficients higher by 20–40% than those in large ones of diameters 54 and 70 mm. One gauge showed a small dependence of the coefficient on the diameter. In order to clarify these results, computer simulations of the electric potential distribution and the electron trajectory inside the envelope were performed. The sensitivity coefficient was also estimated using the potential distribution and the trajectory. The estimation showed a good agreement with the experimental results.
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