A process is described for the operation of an annular combustion chamber and also an annular combustion chamber is shown with numerous circularly arranged premix burners, in which a fuel-air mixture is produced before it is ignited and the fuel-air mixture is used as a hot gas stream to drive at least one turbine stage of a gas turbine plant. A material interconnects the plates. Each section is controlled via current injection. The one or more drivers are configured to receive the one or more multi-frequency excitation signals to induce eddy currents in the part. One preferred application follows the shape of the performer and illuminates the performer using a shape that adaptively follows the performer’s image.