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The aim of this training project is to analyse the thermomechanical behaviour of a particular antenna�s impedance tuners. The purpose of this antenna is to transmit power in the form of electromagnetic waves to the plasma in an experimental thermonuclear fission reactor. These antennas work at high frequencies (40 to 60 MHz).

These impedance tuners are primarily condensers. Their purpose is to adjust the impedance from the end of the antenna transmitting the electromagnetic wave to the plasma. The variable capacity of the condensers should enable the antenna to adapt to variations in plasma impedance in order to avoid the wave being reflected in the antenna.

After a theoretical analysis to ascertain the variables� orders of magnitude, two software packages for finite element method simulation were used for two different antennas.
- In the first case, the study involves a simple geometry condenser, the "end of coax" model, which provides satisfactory results. Under constant conditions, the maximum temperature reaches approximately 270° C with active cooling, either by water (at 1 bar, 25° C), or by helium (at 10 bars, 50° C);
- In the second case, the condenser studied is more complex, and the analysis is notably more precise with regard to the electromagnetic aspect.

Additional information

Authors: TENZA A, Groupe ESIM, Technopôle du Château Gombert, Marseille (FR)
Bibliographic Reference: Report of a training project carried out by a third-year physics student at CEA Cadarache from 10 March to 29 August 2003.
Availability: Available from Association EURATOM-CEA, Département de Recherches sur la Fusion Contrôlée, CEA Cadarache, St Paul-Lez-Durance, France Tel: (+33) 4 42 25 70 01; Fax: (+33) 4 42 25 64 21 E-mail:
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