Nottinghamゲージの試作とその特性

概要

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A modified Nottingham gauge described in this paper has a thin gold film deposited on glass envelope as the screen electrode. Both ends of the electron collecting electrode, a cylindrical grid type, are electronically closed by a pair of wire net. The gauge sensitivity was stable and no effect of Balkhausen-Kurz oscillation was observed in the operating range while in Bayard-Alpert gauge the effect sometimes caused trouble. As this result operation of the gauge at a larger electron emission current than that for a conventional B-A gauge was proved feasible, which in turn results in practically higher sensitivity of the gauge. Electron bombarding power required for outgassing of electrode is about 40 watt d.c.. Glass wall temperature was less than 40°C for normal operation of 0.5 milliampere electron emission. The sensitivity for nitrogen is 20.4±3, the upper limit of linearity is 4μA in ion current for nitrogen. Limit of measurement caused by soft X-ray effect was estimated to be 7×10-11 Torr of nitrogen equivalent pressure. The ultimate pressure of zeolite trap and diffusion pump system used in this study was 2× 10-10 Torr. Some behaviours of the system near the ultimate vacuum are also described.
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