Microwave Communication
As the electron beam moves through a klystron’s intercavity drift space

Frequency modulation at the input cavity creates velocity modulation at the output cavity
Velocity modulation at the input cavity creates density modulation at the output cavity
Phase modulation at the input cavity creates velocity modulation at the output cavity.
Density modulation at the input cavity creates velocity modulation at the output cavity

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Microwave Communication
The cavity resonator

Produces a frequency which is independent of the cavity size.
Has a low Q factor for narrow operation.
In a reflect klystron has its output taken from the reflector plate
Is equivalent to an LC resonant circuit

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