Abstract
A new kind of electron source for electron gun is proposed. It consists of a negative electron affinity photocathode, separated from the rest of the vacuum chamber with a thin alumina film, transparent for electrons and impenetrable for ions and atoms. The cut-off of the barrier film is about 700–900 eV and its transparency is as high as 65% at 1000 eV. The total isolation of two volumes made possible the retaining of the photocathode sensitivity of 1000 μA/lm for 120 h and longer in the large-volume vacuum chamber.
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