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Fig. 2
COPS nude gauge. Main components: (a) outer grid kept at −12 V; (b) cylindrical (11 mm radius and 34 mm height) inner grid maintained at +180 V; (c) 17 mm long hot filament and its backup at +28 V potential; (d) hemispherical reflector at +110 V; (e) base plate at the potential of 0 V; and (f) ion collector.
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