The document summarizes the construction and working of a klystron, which is a vacuum tube that can amplify power at microwave frequencies. It consists of an electron gun, cathode, collector, focusing anodes, two cavities (buncher and catcher), and a drift space. Electrons are emitted from the cathode and pass through the buncher cavity where they become velocity modulated. In the drift space, the electrons interact with the RF signal and become bunched. The electron bunches then pass through the catcher cavity where they produce an amplified output RF signal that is extracted. The klystron is thus able to amplify an input microwave signal through the velocity modulation and bunching of electrons using the cavities and drift space

1. IN THE NAME OF GOD
Klystron
Presented by :
Amir kazemi

2. INTRODUCTION:
A klystron is a vacuum tube that can be used as an amplifier of power , at microwave frequencies.
A klystron is a specialized linear-beam(direction of electron field accelerates electron beam) vacuum
tube(evacuated electron tube)

3. CONSTRUCTION:
1. Electron Gun
2. Cathode
3. Collector
4. Focusing Anodes
5. Tow or multi cavities (buncher and Catcher cavity)
6. Drift Space
7. R f in at buncher cavity
8. R f out at catcher cavity

4. WORKING:
1) Electron emitted by cathode
2) Collected by collector
3) Tow cavities – buncher cavity and catcher
cavity or multi cavity
4) Drift space – interaction between RF signal
and electrons takes place
5) Velocity modulation at buncher cavity
6) Current modulation at catcher cavity
7) Electron bunching – apple gate diagram

5. FUNCTION IN FIRST CAVITY:
The electrons are emitted by the
cathode with high kinetic energy
Cavity resonator is similar to conventional resonant
circuit
Cavity’s resonance depends on the input signal
frequency
Alternating electric field makes the electrons alternating
accelerated and decelerated

6. FUNCTION IN DRIFT SPACE AND SECOND CAVITY :
interaction between
RF signal and
electrons takes place
in drift space
The bunches arrives at intervals corresponding to the
frequency 1st cavity oscillates
The magnetic field produced in the cavity is linked with a
cable and thus initiates amplified output signal
The majority electrons are bunched and these are decelerated and a few arec accelerated
The result is the almost all the kinetic energy is converted into electromagnetic energy

7. THANKYOUFORATTENTION