The temporal evolution of the beam emittance and beam brightness from a field-emission electron gun (1.3 MV, 0.5 kA, 30 ns) has been measured with nanosecond time resolution by using a novel Čerenkov-electro-optic diagnostic. Observations show that guns provided with velvet-backed cathodes behave differently than, and are superior to, the more conventional graphite cathodes.
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Bekefi et al. (1987) studied this question.
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