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Corona discharge vs. electron gun

Bond777
in Classical Physics

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Could we tell there exist principal difference between simple coronating electrode which employs corona discharge to create unipolar charge supply and a high beam current electron gun which employs either high field or thermionic emission to do the same with exception that beam in el. gun is collimated? Could we tell that an electron gun is capable to create principally larger amount of electrons than coronating electrode?

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