Abstract
The features of the use of electron sources based on thermal and field emission in devices of electrovacuum production are considered, including the preservation of the emissive capacity when the operating conditions in a vacuum deteriorate. It is shown that the advantage of metalloporous hot cathodes is the high reduction ability of emission after the device is repeatedly pumped out to the initial pressure. An advantage of high-current field cathodes based on composite diamond-graphite film structures is the stability of the field emission characteristics in a wider range of pressure variations in the device. This improves the operational characteristics of the electrovacuum device (EVD) in the absence of built-in pumping facilities.
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