thermionic source Definition and 1 Threads

A thermionic converter consists of a hot electrode which thermionically emits electrons over a potential energy barrier to a cooler electrode, producing a useful electric power output. Caesium vapor is used to optimize the electrode work functions and provide an ion supply (by surface ionization or electron impact ionization in a plasma) to neutralize the electron space charge.

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  1. Philip Koeck

    A Can cooling enhance the monochromaticity of an electron beam?

    Does a beam of electrons become more monochromatic as it propagates? Can you cool an electron beam noticeably? I'm considering a very narrow beam of electrons with, for example an initial width in the order of 100 nm, and an energy around 1 keV and with a very small divergence angle (maybe 0.01...
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