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Synchrotron/Neutron/Fusion » Fusion » Tuning Stub Outer and Inner Conductors and Sliding Short as part of the International ITER project for Fusion
Tuning Stub Outer and Inner Conductors and Sliding Short as part of the International ITER project for Fusion

ADC provided the design and engineering for Tuning Stub Outer and Inner Conductors and Sliding Short for the Ion Cyclotron Heating (ICH) system on the ITER fusion reactor.

 

Coaxial tuning stubs are required as part of the matching and pre-matching sections of the Ion Cyclotron Heating (ICH) system on the ITER fusion reactor being constructed in France. These stubs facilitate matching the radio frequency (RF) sources to the antennas under various plasma conditions. The matching system uses 50 ohm stubs, while the pre-matching uses 20 ohm stubs. Both types of tuning stubs are 2.5m long use an Outer Conductor with a 301.5mm ID. The difference is in the diameter of the inner conductor – 216mm for the 20 Ohm and 131mm for the 50 Ohm. A movable short or “shorting slug” within the stubs allows for tuning the output. A considerable amount of power loss occurs within the stubs – up to 25.6 kW in the 20 Ohm tuning stub. All 3 major components – inner conductor, outer conductor, and shorting slug are water-cooled to absorb this power loss.

 

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