1 - Electrons are fired by the heated filament of the electron source located at the outer wall of the cavity (1).
2 - The electrons are introduced into the cavity when the electric field is such that it will accelerate the electrons inwards, towards the hollow coaxial cylinder in the center.
3 - The electrons pass through openings in the inner cylinder while the electric field is reversing
4 - On emerging from the inner cylinder, the electrons are further accelerated (towards the outer cavity wall) under the influence of the new reversed field.
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