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Threshold voltage from10-50V per micron and current density about 0.2 A/cm2 were obtained in the first series of experiments. In the second and third series of experiments, a threshold voltage from 1 to 10V/ μm and current density of 1.75 A/cm2 were displayed. The greatest current density more than 20 A/cm2 was obtained using a blade-type emitter.
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