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A load-tolerant External Conjugate-T (ECT) impedance matching system for twoA2 Ion Cyclotron Resonance Heating (ICRH) antennas has been successfully putinto operation at JET. The system allows continuous injection of the RF powerinto plasma in the presence of strong antenna loading perturbations caused byEdge Localized Modes (ELMs). Reliable ECT performance has been demonstratedunder a variety of antenna loading conditions including H-mode plasmas withRadial Outer Gaps (ROG) in the range of 4-14 cm. The high resilience to ELMspredicted during the circuit simulations has been fully confirmedexperimentally. Dedicated arc detection techniques and real-time matchingalgorithms have been developed as a part of the ECT project. The new AdvancedWave Amplitude Comparison System (AWACS) has proven highly efficient indetection of arcs both between and during ELMs. The ECT system has allowed thedelivery of up to 4 MW of RF power without trips into plasmas with Type-I ELMs.Together with the 3dB system and the ITER-Like Antenna (ILA), the ECT hasbrought the total RF power coupled to ELMy plasma to over 8 MW, considerablyenhancing JET research capabilities. This paper provides an overview of the keydesign features of the ECT system and summarizes the main experimental resultsachieved so far.

Design and operations of load-tolerant external conjugate-T matching system for the A2 ICRH antennas at JET