An iterative procedure is described, which models the influence of the thermal expansion of the gyrotron cavity on the expected gyrotron performance. It is a multi-physics simulation method, which involves electrodynamic, thermalhydraulic, and thermo-mechanical simulations. The method is applied to the first European 170 GHz, 1 MW Continuous Wave prototype gyrotron for ITER. According to the simulations, a performance reduction of ~15% is expected at nominal operating parameters, because of the thermal expansion of the cavity. Alternative operating points to mitigate this effect are proposed and numerically validated. The numerical results are discussed in the light of experimental findings.
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