Reflected power in a klystron refers to the power that is sent back towards the input of the klystron due to impedance mismatches or other factors. This can cause inefficiencies in the klystron operation as the reflected power is not contributing to the desired output. Proper tuning and matching of the klystron components can help minimize reflected power.

What is probably the primary advantage of the reflex klystron over the two-cavity klystron is the mechanism used to tune the device. The two-cavity klystron has mechanical tuning, but the reflex klystron is tuned electrically. And it doesn't take an electrical engineering degree for an investigator to figure out that electrical controls can be manipulated a whole bunch faster than a mechanical device.

amplification of input signal.

klystron can act as both an amplifier and oscillator whereas a reflex klystron can act as only an oscillator.

klystron needs a buncher cavity(sometimes multiple bunchers) and a catcher cavity whereas a reflex klystron needs only one cavity.

klystron bunches electrons in forward direction, whereas the other bunches in the reverse direction using a reflector plate.

klystron needs i/p signal (accelerating or deccelerating potential) whereas the other dont.

A: It is a microwave oscillator device.