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 In two-cavity klystron, the direction of region changes by the frequency of the Buncher cavity.   The klystron consists of catcher cavity that takes up energy from the electron beam.   The catcher networks will be arranged with an electron beam and at a location   where the Bunches are fully produced. However, the position will be decided on the basis of the transfer time of bunches.   The collector not just acquires the power of the electron beam but also changes it into temperature and X-radiation.

The significant differences between the two-cavity and reflex klystron are 1.Two-cavity klystron consists of two amplifiers as well as microwave cavity resonators called the buncher and the catcher. 2.Reflex Klystron consists of single cavity is used as an oscillator. 3.Reflex klystron is dissimilar from cavity klystron as it has a single cavity and can be used for modulation or demodulation purpose.

In reflex klystron the flow of electron beam will be throughout the resonant cavity.  After using the resonant cavity the electrons will be reproduced using a negatively stimulated reflector electrode  that is intended to pass electron throughout the cavity after their collection.  Here whenever the electron beam is flowing through the cavity, it is known as velocity modulated.  The voltage of the reflector must be adjusted so that the electron bunching will be at its highest value.