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Description
The COMPASS Tokamak is undergoing a significant upgrade to achieve a high toroidal magnetic field of $B_{\mathrm{T}}=5$~T, high current $I_{\mathrm{p}}\leq 2$~MA and a high density \cite{vondracek2021}. To ensure sufficient power for reaching a promising advanced confinement mode and controlling high $Z$ impurities in the plasma, a new Electron Cyclotron Resonance Heating (ECRH) system is planned for operation at the end of 2026.
To meet the requirements of a diverse experimental program, the power capability of the ECRH system is planned to be at least $1$~MW for $10$ seconds at a frequency of $140$~GHz for central power deposition. The transmission line will be constructed from a $63.5$~mm corrugated HE$_{11}$ waveguide with appropriate cooling.
In the first phase, the launcher will consist of an open-ended waveguide designed only for central plasma heating. Subsequent adjustments, achieved through front-steering mirrors, will enable central power deposition even for a toroidal magnetic field $4.3$~T.
This contribution will provide a detailed description of the studies conducted to develop the new ECRH system for the COMPASS Upgrade tokamak.
