Question

Consider the following statements regarding Bunching process in Klystron:

1. Bunching occurs in two cavity Klystron amplifiers

2. Bunching occurs in multi cavity Klystron amplifiers

3. Bunching occurs in reflex Klystron oscillators

Which of these statements are correct?

1. 1 and 2 only
2. 2 and 3 only
3. 1 and 3 only
4. 1, 2 and 3

Answer 1

Correct Answer - Option 4 : 1, 2 and 3

The klystron is a device for amplifying microwave frequency signals that achieve high levels of power gain by applying vacuum tube principles and the concept of “electron bunching”.

ELECTRON BUNCHING-

• Electrons in a beam leaving a source at high velocity all have a roughly equal velocity in the direction of travel.
• But when we put a structure(grid) in their path of flows which can slows down their speed then the result will a density modulation or bunching proportional to the applied force on the electrons as imparted by the buncher resonant cavity.
• The end result is effectively an RF-modulated current between the buncher and the catcher.
• This is known as bunching.