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The torus window, which was manufactured for injection of up to 1 MW mm-wave power at 4 selected frequencies between 105 - 140 GHz into the plasma of ASDEX Upgrade, works on the principle of a double disk arrangement of two large area CVD diamond disks. The thickness of the two disks was 1.8 mm as this fulfils the resonant disc condition and thus provides low reflection at the frequency range limits...
Summary form only given. The development of conventional cavity gyrotrons at 140 GHz with 1-MW, CW output power at Forschungszentrum (FZK) Karlsruhe is mainly linked with the construction of the new superconducting stellarator W7-X at IPP Greifswald, Germany. For W7-X, 10 MW of electron cyclotron heating (ECRH) is planned and will be produced by ten gyrotrons each with a power of 1-MW. The gyrotrons...
The development work on coaxial cavity gyrotrons has demonstrated the feasibility of manufacturing of a 2 MW, CW 170 GHz tube that could be used for ITER. The problems specific to the coaxial arrangement have been investigated and all relevant information needed for an industrial realization of a coaxial gyrotron have been obtained in short pulse experiments (up to 17 ms). The suitability of critical...
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