Radioisotope-powered ion gauge with super high stability, long life, and large sensitivity range from ultrahigh vacuum to high pressure
(Color online) Schematic of the experiment setup. The gap between the and the stainless steel plate is 1 mm. The size of the thin film source is .
(Color online) (a) Logarithmic plot of the measured total current vs pressure curve of the device, with pressure ranging from up to , at room temperature. (b) Linear plot curve of total current vs pressure for the high vacuum region. The total current is almost linear with pressure. We extrapolate the curve to the ideal absolute vacuum case (zero pressure) and get a constant current value . (c) Logarithmic plot of the measured ionization current vs pressure curve. Here, we define ionization current by . (d) Linear logarithmic plot of the measured ionization current vs pressure curve.
(Color online) Source current stability characterization. (a) Total current vs time measurement under constant high vacuum pressure at room temperature. (b) Measured Allan Variance versus averaging time for the source emission current, under constant high vacuum pressure at room temperature.
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