Transcript reflex klystron

Varian reflex klystron: Electrons emitted from the heated cathode
travel through the cavity grids toward the repeller plate and
returned back through the grids. Self-sustaining oscillations
develop, the frequency can be changed by adjusting the repeller
voltage or changing the physical dimensions by squeezing the
plates together
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Magnetrons
Magnetrons are devices capable of creating high energy
electromagnetic microwave radiation. A. W. Hull first
investigated their behavior in 1921. They are composed of
a hollow tube with a filament in the middle. The outer part
of the tube acts as an anode while the filament is the
cathode. When this filament is heated it releases electrons,
which try to travel to the positive anodes on the outer tube.
However, an external magnetic field passing through the
tube keeps the electrons from reaching the anodes and
forces them to move in circles around the cavities in the
tube. This creates radiation at the resonance frequency of
the tube.
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