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Thermionic cloud

  1. Mar 23, 2014 #1

    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
  2. jcsd
  3. Mar 23, 2014 #2


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    Welcome to Physics Forums.

    I suggest a google image search.


    Just type thermionic cloud in the search box. Several ways of representing the electrons come up among the choices.

    Thermionic space charge is another good search phrase.
    Last edited: Mar 23, 2014
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