Study and realization of the rapid safety system of heating at electron cyclotron frequency. Rapid safety system to protect the gyrotrons of the heating at the electron cyclotron frequency (F - 110 GHz and F - 118 GHz)

As part of the research on controlled thermonuclear fusion, conducted within the CEA, heating at electron cyclotron frequency, currently in operation on the Cadarache Tokamak - Tore Supra, is an experiment using gyrotrons 110 and 118 GHz. Gyrotrons are oscillators of electromagnetic waves that, when applied to fusion, heat the plasma. The purpose of this memoir is to present the rapid safety system which protects the gyrotrons and the equipment that surround them (transmission lines, antenna, high voltage system). This system has been studied and realized in order to combine a high response speed, the safety and reliability of a cable system, and then the flexibility of a programmable system. Installed and tested on the 110 GHz prototype gyrotron, the operation of the rapid safety system is correct. All the characteristics of the specifications are respected. This system is of interest to other users such as those responsible for heating at the inferior hybrid frequency (F - 3.7 GHz) and for the electronic laboratory. An improvement is proposed, which can be very useful for more complex experiences. (author)