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The design of the WEST (Tungsten-W Environment in Steady-state Tokamak) Ioncyclotron resonance heating antennas is based on a previously testedconjugate-T Resonant Double Loops prototype equipped with internal vacuummatching capacitors. The design and construction of three new WEST ICRHantennas are being carried out in close collaboration with ASIPP, within theframework of the Associated Laboratory in the fusion field between IRFM andASIPP. The coupling performance to the plasma and the load-tolerance have beenimproved, while adding Continuous Wave operation capability by introducingwater cooling in the entire antenna. On the generator side, the operation classof the high power tetrodes is changed from AB to B in order to allow high poweroperation (up to 3 MW per antenna) under higher VSWR (up to 2:1). Reliabilityof the generators is also improved by increasing the cavity breakdown voltage.The control and data acquisition system is also upgraded in order to resolveand react on fast events, such as ELMs. A new optical arc detection systemcomes in reinforcement of the V r /V f and SHAD systems.

Ion cyclotron resonance heating systems upgrade toward high power and CW operations in WEST