How can i build electron canyon?

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hi, I'm new in this forum, i was wondering how to build an electron canyon? does somebody knows?
 
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What do you mean by an "electron canyon"?
 
"Electron cannon"? An accelerator for electrons? I would use existing cathode ray tubes. The basic concept is one hot wire (emitting electrons) and a potential difference (accelerating the electrons) in a vacuum.
 
thanks a lot, sorry about my writting
 
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