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The design of an automatic matching device for TEXTOR's ICRH system has evolved considerably and its optimisation has led to a variety of final solutions, in particular with respect to the capacitor's actuators and the signal processing and feedback part of the project. The system is located between the generator and the existing double stub tuner and consists of a second double stub tuner, of which each stub is made up of a variable capacitor compensated by an inductive stub. The main double stub tuner is needed for coarse matching, eg. at 32.5 MHz to within 18 % power reflected, in order to relax otherwise possibly over-stringent conditions for the variable capacitors. Each capacitor is positioned by a servomotor-driven mechanism compensating the vacuum and linearly varying elastic return forces of the capacitor's bellows all along its stroke. This paper describes mechanical, electrical and feedback issues as well as a complete simulation of the system's behaviour.

Additional information

Authors: DURODIÉ F, Ecole Royale Militaire, Bruxelles (BE);VERVIER M, Ecole Royale Militaire, Bruxelles (BE)
Bibliographic Reference: Article: Proceedings of the Europhysics Topical Conference on Radiofrequency Heating and Current Drive of Fusion Devices (1992) pp. 81-84
Record Number: 199310454 / Last updated on: 1994-11-29
Original language: en
Available languages: en
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