Phase-locked relativistic magnetrons in both 'half module' and 'full module' configurations were operated at power levels of 2.0 and 2.9 GW rms peak (4.1 and 5.8 GW instantaneous peak), respectively, at 2.8 GHz. Different interconnection geometries are investigated; the authors verify that the 'hybrid' geometry works best, as previously predicted by numerical modeling.
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