Efficiency Enhancement in Megawatt Level Broadband Microwave Amplifiers.

The report covers effort expended on a theoretical and experimental investigation of methods of improving the conversion efficiency of relatively broadband linear-beam amplifiers operating at approximately 1 Mw of peak power. A design was achieved using a short-stack intense- approximately 1 Mw of peak power. A design was achieved using a short-stack intense-interaction cloverleaf structure a forward-fundamental, coupled-cavity circuit. Computer-aided calculations predicted 40 minimum efficiency over a 9 bandwidth with a midband efficiency greater than 60.