12 DIAMETER CATHODE RAY TUBE.
Interim development rept. no. 2, 2-31 Aug 65,
DUMONT ELECTRON TUBES CLIFTON N J
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Two experimental tubes are being fabricated. The first assembly is expected to define the operating characteristics of a virtual cathode ahead of a focussing beam control element. The second assembly will test the sensitivity of a large area curved cathode for beam current modulation. High modulation sensitivity means a large figure of transconductance. In turn this directly implies a large area of cathode emission is directly controlled as an electron beam of usable cross-section and exit angle. Otherwise a useful phosphor screen spot size is not attained. Phosphors that are being investigated now are in the magnesium flouride, manganese activated category. These are characterized as long persistance types with an orange phosphorescence.