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Field emission from nanocarbon films was investigated experimentally for the conditions ofhigh-voltage vacuum tubes: high voltage (up to 40-45 kV, dc or/and pulsed) applied to a wide (1.5-5 mm)planar gap in technical vacuum. Emission characteristic were demonstrated to be different (worse) than theones measured and 100-μm gaps correspondingly lower applied voltages. Substantial delay (a few μs) ofemission current pulses relative to the pulses of voltage was observed, which can be considered as reversibleactivation of the emitter by its own current.
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