The klystron is a Vacuum tube which makes it possible to carry out Amplificateur S of average and strong power with narrow band in ultra high frequencies. They appeared between 1930 and 1940 and their powers can reach more than 1000 KW.
The klystrons are used in particular in the radars, the accelerators for Radiothérapie or Stérilisation, the stations of televisual emission UHF, the satellite stations of diffusion, the heating by Micro-ondes or the high-energy physics (, linear particle accelerator synchrotrons,…).
Principle of operation
The klystrons are used like an oscillator or more often like an amplifier of microwaves. The signal HF in entry of a klyston is amplified in a coherent way thanks to a beam of electron. For that, one prints a modulation speed to the electron beam. This modulation speed of the electrons is transformed into a modulation of density, that is to say in current. One then makes interact this current with an electromagnetic wave (the entry HF) via cavity resonators. The electrons then yield their kinetic energy in electromagnetic form.
References
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