Abstract
Ion focusing vacuum gauge was applied to measure the time varying neutral gas pressure in the Heliotron D toroidal chamber.Gas was puffed from a coaxial gun which was joined to the chamber with a thine pipe. Measurement-was done without producing plasma.The pressure range 10-4 to 10-7 Torr could be measured without difficulty.When a pulse of 50 volt hight and 10 μsec width was applied to the gauge, the increased in collecter current was 100 μA for 10-6 Torr.
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