Article | REF: E1621 V2

Microwave Electron Tubes – High power tubes

Author: Thierry LEMOINE

Publication date: May 10, 2017, Review date: December 15, 2022

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3. Gyrotrons

3.1 Gyrotron operating principle

Like magnetrons, gyrotrons are oscillators (they hang on noise), except that they are used at much higher frequencies (between 50 and 200 GHz, sometimes below, increasingly above). They deliver fantastic power (up to 2 MW CW) and are reserved for very specific applications, some of which are important enough to be presented here.

Example:

In the case of thermonuclear fusion, there will be around twenty gyrotrons to power the ITER reactor.

Developed around 1958 in the USA and the USSR, their operation is complex, and we'll only give a simplified overview. Electrons are generated by an impregnated cathode, and accelerated by a gun. They...

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Gyrotrons