Thermionic cloud

Hello:

I would like to include a diagram for my presentation showing a thermionic cloud. I’ve looked on the computer for something to get me started and have come to a dead end. Does anyone know where I can look to get some ideas of what a thermionic cloud looks like?

My understanding is that it is a cloud of negatively charged electrons around the cathode (negative) end.

Thank you

http://ift.tt/1gffSb6

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